ATT_02a_Division_05_Metals.pdf

1 Division 05 - Metals

DIVISION 05 - METALS

SECTION 05120- STRUCTURAL STEEL

PART 1 – GENERAL

A. Summary:

1. Structural Steel framing members, structural steel support members, complete with required bracing, welds, washers, nuts, shims, bolts and anchors.

2. Base plates and bearing plates.

3. Erection and connecting structural steel frame.

4. Grouting under base plates and bearing plates.

B. Related Work:

1. Division 3, Section “Cast-in-place Concrete

2. Division 5, Section “Metal Stairs and Handrails”

3. Division 4, Section “Cavity Wall Masonry System”

4. Division 6, Section “Miscellaneous Carpentry”.

C. References:

1. ASTM A 572: Structural Steel

2. ASTM A 53: Pipe, Steel, and Hot-Dipped, Zinc-Coated Welded and Seamless.

3. ASTM A 325: High Strength Bolts for Structural Steel Joints, Including Suitable

Nuts and Plain Hardware Washers.

4. ASTM A 490: Quenched and Tempered Alloy Steel Bolts for Structural Steel

Joints.

5. AWS D1.1: Structural Welding Code.

6. AISC “Code of Standard Practice for Steel Buildings and Bridges” and

Commentary.

7. AISC “Specification for the Design, Fabrication and Erection of Structural Steel for Buildings: and including the “Commentary” and Supplements thereto.

8. AISC “Specification for Structural Joints using “ASTM A 325 or A 490 bolts”.

9. SSPC SP2: Surface Preparation Specification No. 2- Hand Tool Cleaning.

10. ASTM A 123 Zinc (Hot-Dip galvanizing) coatings for iron and steel products.

D. Submittals:

1. Submittals: Submit in accordance with Division 1 requirements.

2. Shop Drawings:

b. Submit shop drawings including complete details and schedules for fabrication and shop assembly of members, details, schedules, procedures and diagrams showing the sequence of erection.

c. Include details of cuts, connections, camber, holes and other pertinent data.

Include welds by AWS symbols, show size, length and type of each weld.

d. Provide setting drawings, templates and directions for the installation of anchor bolts and other anchorages to be installed under other Sections of the specification.

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e. Erection drawings and shop details will clearly show the capacity of the connections designed by the fabricator.

Section 05120- Structural Steel Cont.

f. The ESD Project Manager and/or Inspector review of shop drawings is for general conformance with design concepts only. Compliance with requirements for materials, fabrication and erection of structural steel is the

Contractor’s responsibility.

g. Welder certificates signed by the Contractor certifying that welders comply with requirements specified under the “Quality Assurance” Article.

E. Quality Assurance:

1. The work in this Section will be subject to all applicable provisions of the IBC and OSHA Safety Codes and any other codes referenced herein.

2. Any material or operation specified by referenced to the published specification of a manufacturer will comply will comply with the requirements of the standards listed herein.

3. If requested by the ESD representative, furnish an affidavit from the manufacturer or fabricator certifying that the materials or products delivered to the job meet the requirements specified. Such certification will not relieve the Contractor from the responsibility of complying with the requirements of the Contract Documents.

4. AISC Code of Standard Practice: Make the following modifications:

a. Delete Paragraph 3.3 Substitute the following: All things which, in the opinion of the Contractor, appear to be deficiencies, omissions, contradictions or ambiguities in the Contract Documents will be brought to the attention of the ESD Project Manager.

The Contract Documents will be corrected or a written interpretation of the alleged deficiency, omission, contradiction or ambiguity will be made by the

ESD Project Manager before the effected work proceeds.

b. Qualifications for Welding Work:

1. Qualified welding processes and welding operations in accordance with the WAS “Standard Qualification Procedure”.

2. Provide certification that welders to be employed in the work have satisfactorily passed AWS qualification tests within the previous 12 months.

c. Qualification of Welding Work:

1. Qualified welding processes and welding operators in accordance with the

AWS “Standard Qualification Procedure”.

2. Provide certification that welders to be employed in the work have satisfactorily passed AWS qualification tests within the previous 12 months. If re-certification of welders is required, re-testing will be the

Contractor’s responsibility.

d. Quality Control: The Contractor is responsible for all quality control. The

Contractor will be responsible to correct structural steel which does not conform to the specified requirements.

e. Quality Control Monitoring:

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1. ESD Project Manager and Inspector will monitor quality control by means of inspection, testing and reports as specified below:

Section 05120- Structural Steel Cont.

a. High Strength Bolted Connections: Inspect and test in accordance with AISC Specification for Structural Joints and as follows:

1. Inspection of the Work by ESD does relieve the Contractor of his responsibility to perform the Work in accordance with the Contract Documents.

2. Promptly remove and replace materials or fabricated which do not comply with requirements of the Contract Documents.

b. Design of Connections:

1. The Contractor is responsible for the design and adequacy of all connections that are not designed on the Contract

Documents.

2. Retain a professional engineer to submit shop drawings indicating the connections not shown or partially shown on the Contract Documents.

c. Detailing of Members:

1. All details shown are typical; similar details apply to similar conditions, unless otherwise indicated. Verify dimensions at the Project site wherever possible without causing delay in the Work.

2. Promptly notify the ESD Project Manager whenever the design of members for any portion of the structure is not clearly indicated.

F. Delivery, Storage, and Handling:

1. Deliver material to the site at such intervals to insure uninterrupted progress of the

Work.

2. Deliver anchor bolts and anchorage devices, which are not to be embedded in cast-in-place concrete or masonry, in ample time to not delay the Work.

3. Store material to permit easy access for inspection and identification. Keep steel members off the ground, using pallets, platforms or other supports. Protect steel members and packaged materials from corrosion and deterioration.

4. Do not store material on the structure in a manner that might cause distortion or damage to the members or the supporting structures. Repair or replace damaged materials or structures as directed.

PART 2 – PRODUCTS

A. Materials:

1. Rolled Steel Plates, Shapes and Bars: Domestic steel as shown on the drawings (if foreign steel is supplied, it will meet all ASTM requirements and the shapes must be standard U.S. rolled sections as shown on the drawings).

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2. ASTM A 572 for all primary structural framing including all beams and columns. ASTM A 36 for all secondary framing and connections.

3. Steel Pipe: ASTM A 53.

Section 05120- Structural Steel Cont.

4. Anchor Bolts: ASTM A 36.

5. High-Strength Threaded Fasteners: Bolts, nuts and hardened washers complying with ASTM A 325 or A 490.

6. Electrodes for Welding: Comply with requirements of Table 4.1.1 of AWS

D1.1.

7. Structural Steel Primer Paint: Non-Lead Primer.

8. Non-shrink Grout:

a. Provide pre-mixed, non-metallic, noncorrosive, non-staining product containing selected silica sands, Portland cement, shrinkage compensating agents, plasticizing and water reducing agents complying with CRD C588, Type D.

9. Minimum Compressive Strength of non-shrink grout when tested in accordance with ASTM C 109.

a. 7,000 psi after 7 days.

10. Non-shrink grout will be used under all steel base plates and bearing plates.

11. Grout will be non-corrosive containing no corrosive iron, aluminum or gypsum.

12. All grouting will be performed in accordance with recommendations of ACI and grout manufacturer’s printed specification for site preparation, product mixing and placing.

13. Drilled-in expansion Bolts: See Concrete Specification 03300 for requirements.

14. Adhesive Anchor Bolts: See Concrete Specification 03300 for requirements.

B. Fabrication:

1. Shop Fabrication and Assembly:

a. Fabricate and assemble structural assemblies in the shop to the greatest extent possible. Fabricate items of structural steel in accordance with

AISC Specifications and as indicated on the final Shop Drawings.

b. Properly mark and match-mark materials for field assembly. Fabricate for delivery sequence which will expedite erection and minimize field handling of materials.

c. Where Shop Drawings are required, complete the assembly, including welding of units, before start of finishing operations. Provide finish surfaces of members exposed to view in the final structure free of markings, burrs, and other defects.

d. Provide beams where noted with camber obtained by the applied heat method. Tolerance will be plus or minus 3/16 inch from camber indicated.

2. Connections:

a. Weld or bolt shop connection, as indicated on the Drawings.

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b. Bolt field connections, except where welded connections or other connections are indicated on the Drawings. Provide high-strength threaded fasteners for all bolted connections.

c. High-Strength Bolted Connections: Install high-strength threaded fasteners in accordance with AISC “Specification for Structural Joints using ASTM

A 325 or 490 Bolts”, except that X type bearing connections will not be used. All bolts will be tightened to the “Snug-tight” condition in accordance with Supplement No. 1 of the AISC Code.

d. Welded Connection: Comply with AWS Code for procedures, appearance and quality of welds. Welds will be 1/4” fillet minimum unless noted otherwise on the drawings.

3. Holes for Other work:

a. Provide holes required for securing other work involving structural steel framing and for the passage of other Work through steel framing members, as shown on the final Shop drawings.

b. Provide threaded nuts welded to framing and other specialty items as shown to receive other Work.

c. Cut, drill or punch holes perpendicular t metal surfaces. Do not flame cut holes or enlarge holes by burning. Drill holes in base plates and bearing plates.

B. Shop Painting:

1. Shop Paint structural steel, except as follows:

a. Structural steel members indicated to be hot-dipped galvanized.

b. Structural steel surfaces to be welded or high strength bolted with friction type connections.

c. Structural steel members or those members or portions of members to be embedded in concrete or mortar. (Paint embedded steel which is partially exposed on the exposed portions and the initial two inches of embedded areas only).

2. Shop and Field Paint structural steel as follows:

a. Clean structural steel scheduled to be painted. Remove loose rust, loose mil scale, splatter, and slag or flux deposits. Clean steel in accordance with Steel Structures Painting Council (SSPC): SP-2 “Hand Tool

Cleaning”.

b. Immediately after surface preparation, apply primer paint in accordance with the manufacturer’s instructions and at a rate to provide a uniform dry film thickness of 2.0 mils. Use painting methods which will result in full coverage of joints, corners, edges, and all exposed surfaces.

PART 3 – EXECUTION

A. Inspection:

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1. The Contractor and the structural steel erection contractor will separately check and agree on the correct positioning of anchor bolts before concrete is placed.

2. Examine the areas and conditions under with the structural steel work is to be installed, and notify the ESD Project Manager in writing of the conditions detrimental to the progress and timely completion of the Work.

3. Do not proceed with the Work until unsatisfactory conditions have been corrected.

B. Erection:

1. Erect steel in accordance with AISC “Code of Practice for Steel Buildings and

Bridges and Commentary as modified herein.

2. Provide temporary shoring and bracing members with connections of sufficient strength to bear imposed loads. Remove temporary members and connections when permanent members are in place and final connections are made. Provide temporary guy lines to achieve proper alignment of the structure as erection proceeds.

3. Provide temporary planking and working platforms as necessary to effectively complete the Work.

4. Furnish anchor bolts and other connectors required for securing structural steel to foundations and other in place Work.

5. Furnish templates and other devices as necessary for presetting bolts and other anchors to accurate locations.

6. Prior to setting base plates and bearing plates, clean concrete and masonry bearing surfaces of bond-reducing materials and roughen to improve bond to surfaces. Clean the underside of base and bearing plates.

7. Set loose and attached base plates and bearing plates for structural members on wedges and other adjusting devices. Tighten the anchor bolts after the supported members have been positioned and plumbed. Do not remove wedges or shims, but if protruding, cut off flush with the edge of base or bearing plate prior to packing with grout.

8. Pack grout solidly between bearing surfaces and base or bearing plates to ensure no voids remain. Finish exposed surfaces, protect installed materials and allow to cure in strict accordance with manufacturer’s instructions.

9. Set structural frames accurately to the line and elevations indicated. Align and adjust the various members forming a part of the complete frame or structure before permanently fastening. Clean bearing surfaces and other surfaces which will be in a permanent contact before assembly. Perform necessary adjustments to compensate for discrepancies in elevations and alignments.

10. Level and plumb individual members of the structure within specified AISC tolerances.

11. On exposed welded construction, remove erection bolts, fill holes, and plug welds and grind smooth at exposed surfaces.

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12. Comply with AISC Specifications for bearing, adequacy of temporary connections, alignment and the removal of paint on surfaces adjacent to field welds.

13. Install expansion bolts in strict accordance with the manufacturer’s recommendations including specing and edge distances.

Section 05120- Structural Steel Cont.

14. Do not use gas cutting torches in the field for correcting fabrication errors in the structural framing. Cutting will be permitted only on secondary members which are not under stress, and only when approved by ESD Inspections.

Finish gas-cut sections in accordance equal to requirements of Section 3.2.2 of

AWS D1.1 when permitted.

15. Immediately after erection, clean field welds, bolted connections and abraded areas of shop primed members. Apply primer to exposed areas with the same material as used for shop painting. Apply by brush or spray to provide a minimum dry film thickness of 2.0 mils.

16. No alterations will be performed in the field without written approval of the

ESD Inspector.

End of Section- 05120

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SECTION 05500- METAL FABRICATIONS

1. Work under this Section includes metal stairs and all items of miscellaneous structural steel and other miscellaneous metal items specified herein or otherwise inferred or required for construction.

a. Related Sections:

1. Division 9, Section ”Painting”

B. Submittals:

2. Product Data for nonslip aggregates and nonslip aggregate surface finished, prefabricated building columns, cast nosings, treads and thresholds, steel floor plates, paint products and grout.

3. Shop drawings detailing fabrication and erection of each metal fabrication indicated. Include plans, elevations, sections, and details of metal fabrications and their connections. Show anchorage and accessory items. Provide templates for anchors and bolts specified for installation under other Sections.

4. Sample representative of materials and finished products as may be requested.

5. Welder certificates signed by Contractor certifying that welds comply with requirements specified in the “Quality Assurance” article of the Section.

6. Qualification data from firms and persons specified in the “Quality Assurance” article of this Section to demonstrate their capabilities and experience. Include a list of completed projects with project name, addresses, names of Engineers and

Owners, and other information specified.

7. Welder certificates signed by the Contractor certifying that welders comply with requirements specified under the “Quality Assurance” Article.

C. Quality Assurance:

1. Fabricator Qualifications: firm experienced in producing metal fabrications similar to those indicated for this Project with a record of successful in-service performance, and with sufficient production capacity to produce required units without delaying the Work.

2. Welding Standards: Comply with applicable provisions of AWS D1.1 “Structural

Welding Code-Steel”, AWS D1.2 “Structural Welding Code-Aluminum”, and

AWS D1.3 “Structural Welding Code-Sheet Steel”.

a. Certify that each welder has satisfactorily passed AWS qualification tests for welding process involved and, if pertinent, has undergone recertification.

3. Codes and Standards: Comply with provisions of the latest edition of the following codes, specifications, and standards, except where more stringent requirements are shown or specified:

a. Kentucky Building Code

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Section 05500- Metal Fabrications Cont.

b. AISC “specifications for the Design, Fabrication, and Erection of Structural

Steel for Buildings”.

c. AISC “Code of Standard Practice for Steel Buildings and Bridges”, and commentary.

D. Project Conditions:

1. Field Measurements: Check actual locations of walls and other construction to which metal fabrications must fit by accurate field measurements before fabrication. Show recorded measurements on final Shop Drawings. Coordinate fabrication schedule with construction progress to avoid delaying the Work.

a. Where field measurements cannot be made without delaying the Work, guarantee dimensions and proceed with fabricating products without field measurements. Coordinate construction to ensure that actual dimensions correspond to guaranteed dimensions. Allow for trimming and fitting.

A. Ferrous Metals:

1. Metal Surfaces, General: For metal fabrications exposed to view in the completed Work, provide materials selected for their surface flatness, smoothness, and freedom from surface blemishes.

2. Steel Plates, Shapes, and Bars: ASTM A 36 (ASTM A 36M).

3. Rolled Steel Floor Plates: ASTM A 786 (ASTM A 786M).

4. Hot-rolled Carbon Steel Bars (and Bar size shapes): ASTM 575, Grade as selected by fabricator.

5. Hot-Rolled Carbon Steel Sheets and Strips: ASTM A 568 and ASTM A 569, picked and oiled.

6. Cold-Rolled Carbon Steel Sheets: ASTM A 366.

7. Galvanized Carbon Steel Sheets: ASTM A 526 with 2.0 oz. “Commercial

Galvanizing” per ASTM A 525.

8. Steel Tubing: Product type (manufacturing method) and as follows:

a. Cold-Formed Steel Tubing: ASTM A 500.

b. Hot-Formed Steel Tubing: ASTM A 501.

9. Steel Pipe: ASTM A 53, standard weight (Schedule 40), unless otherwise indicated, or another weight required by standards.

10. Masonry Anchorage Devices: Expansion shields as follows:

a. Lead expansion shields for machine screws and bolts ¼” and smaller, head-out embedded nut type, single inti class.

b. Lead expansion shields for machine screws and bolts larger than ¼” in size;

head-out embedded nut type, multiple unit class.

11. Welding Rods and Bare electrodes: Select according to AWS specifications for the metal alloy to be welded.

B. Aluminum:

1. Aluminum extrusions: ASTM B 221 (ASTM B 221M), alloy 6063-T6.

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2. Aluminum-Alloy Rolled Tread Plate: ASTM B 632 (ASTM B 632M), Pattern 1, alloy 6061-T6.

C. Paint:

1. Shop Primer for Ferrous Metals: See Division 9, Section “Painting”.

2. Galvanizing Repair Paint: High-zinc-dust-content paint for regalvanizing welds in galvanized steel, with dry film containing not less than 94 percent zinc dust by weight, and complying with DOD-P-21035 or SSPC-Paint 20.

3. Bituminous Paint: Cold-applied asphalt mastic complying with SSPC-Paint 12, except containing no asbestos fibers.

D. Fasteners:

1. General: Provide plated fasteners complying with ASTM B 633, Class Fe/Zn 25 for electrodeposited zinc coating, for exterior use or where built into exterior walls. Select fasteners for the type, grade, and class required.

2. Bolts and Nits: Regular hexagon-head bolts, ASTM A 307, Grade A (ASTM F

568, Property Class 4.6), with hex nuts, ASTM A 563 (ASTM A 563M).

3. Machine Screws: ANSI B18.6.3 (ANSI B18.6.7M).

4. Lag Bolts: ANSI B18.2.1 (ANSI B18.2.3.8M).

5. Wood Screws: Flat head, carbon steel, ANSI B18.6.1.

6. Plain Washers: Round, carbon steel, ANSI B18.22.1 (ANSI B18.22M0.

7. Lock Washers: Helical, spring type, carbon steel, ANSI B18.21.1.

8. Expansion Anchors: See Concrete Specification, Section 03300.

9. Adhesive Anchors: See Concrete Specification 03300.

10. Toggle Bolts: FS FF-B-588, tumble-wing type, class and style as required.

E. Galvanizing:

1. ASTM A 153 for galvanizing iron and steel hardware.

2. ASTM A 123 for galvanizing rolled, pressed and forged steel shapes, plates, bars and strip 1/8” thick and heavier (Galvanizing will be 2 oz. per sf minimum).

3. ASTM A 386 for galvanizing assembled steel products.

F. Fabrication, General:

1. Form metal fabrications from materials of size, thickness, and shapes indicated but not less than that needed to comply with performance requirements indicated.

Work to dimensions indicated or acceptable on Shop Drawings, using proven details of fabrication and support. Use type of materials indicated or specified for various components of each metal fabrication.

2. Form exposed members true to line and level with accurate angles and surfaces straight strait sharp edges.

3. Allow for thermal movement resulting from the following maximum change

(range) in ambient temperature in the design, fabrication, and installation of installed metal assemblies to prevent buckling, opening up of joints, and overstressing of welds and fasteners.

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4. Base design calculations on actual surface temperatures of metals due to both solar heat gain and nighttime sky heat loss.

a. Temperature Change (Range): 100 deg F.

5. Shear and punch metals cleanly and accurately. Remove burrs.

6. Ease exposed edges to a radius of approximately 1/32 inch (1 mm), unless otherwise indicated. Form bent-metal corners to smallest radius possible without causing grain separation or otherwise impairing Work.

7. Remove sharp and rough areas on exposed traffic surfaces.

8. Weld corners and seams continuously to comply with the following:

a. Use materials and methods that minimize distortion and develop strength and corrosion resistance of base metals.

b. Obtain fusion without undercut or overlap.

c. Remove welding flux immediately.

d. At exposed connections, finish exposed welds and surfaces smooth and blend so that no roughness shows after finishing; finish contour of weld to match surface adjacent.

9. Form exposed connections with hairline joints, flush and smooth, using concealed fasteners wherever possible. Use exposed fasteners of type indicated, or, if not indicated, Phillips flat-head (countersunk) screws or bolts.

10. Provide for anchorage of type indicated; coordinate with supporting structure.

Fabricate and space anchoring devices to secure metal fabrications rigidly in place and to support indicated loads.

11. Shop Assembly: Preassemble items in shop to the greatest extent possible to minimize field splicing and assembly. Disassemble units only as necessary for shipping and transporting, and handling limitations. Use connections that maintain structural value of joined pieces. Clearly mark units for reassembly and coordinated installation.

12. Cut, reinforce, drill, and tap metal fabrications as indicated on Shop Drawings to receive finish hardware, screws, and similar items.

13. Fabricate joints that will be exposed to weather in a manner to exclude water, or provide weep holes where water may accumulate.

G. Loose Bearing and Leveling Plates:

1. Provide loose bearing and leveling plates for steel items bearing on masonry or concrete construction, made flat, free from warps or twists, and of the required thickness and bearing area. Drill plates to receive anchor bolts for the grouting as required. Galvanized after fabrication.

H. Loose Steel Lintels:

1. Fabricate loose structural steel lintels from steel angles and shapes of size indicated for openings and recesses in masonry walls and partitions at locations indicated.

2. Weld adjoining members together to form a single unit where indicated. Size loose lintels for equal bearing of 1 inch per foot of clear span but not less than 8 inches bearing at each end.

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3. Size loose lintels for equal bearing of 1 inch per foot of clear span but not less than 8 inches bearing at each end of openings, unless otherwise indicated.

Minimum size will be 5x3-1/2x5/16 inches.

4. Galvanize loose steel lintels located in exterior walls.

I. Shelf and Relieving Angles:

1. Fabricate shelf and relieving angles from steel angles of size indicated and for attachment to concrete framing. Provide slotted holes to receive ¾ inch bolts, spaced not more than6 inches from ends and not more than 24 inches o.c. unless otherwise indicated.

2. For cavity walls, provide vertical channel brackets to support shelf/relieving angles from back-up masonry and concrete. Align expansion joints in angles with indicated control and expansion joints in cavity wall exterior wythe.

3. Shelf angles to be installed on exterior concrete or masonry walls are to be galvanized.

4. Furnish wedge-type concrete inserts, complete with fasteners to attach angles to cast-in-place concrete.

J. Miscellaneous Framing and Supports:

1. General: Provide steel framing and supports for applications indicated that are not a part of structural steel framework as required to complete the Work.

2. Fabricate units to sizes, shapes, and profiles indicated and required to receive other adjacent construction retained by framing and supports. Fabricate from structural steel shapes, plates, and steel bars of welded construction using mitered joints for field connection. Cut, drill, and tap units to receive hardware, hangers, and similar items.

a. Equip units with integrally welded anchors for casting into concrete or building into concrete masonry. Furnish inserts if units must be installed after concrete and concrete masonry is places.

1. Except as otherwise indicated, space anchors 24 inches o.c., and provide minimum anchor units in the form of steel straps 1-1/4 inches wide by

1/4 inch thick by 8 inches long.

3. Galvanize miscellaneous framing and supports at exterior locations.

K. Miscellaneous Steel Trim:

1. Unless otherwise indicated, fabricate units from structural steel shapes, plates, and bars of profiles shown with continuously welded joints, and smooth exposed edges. Miter corners and use concealed field splices wherever possible.

2. Provide cutouts, fittings, and anchorages as required to coordinate assembly and installation with Work by others. Provide anchors, welded to trim, for embedding in concrete or masonry construction, spaced not more than 6 inches from each end, 6 inches from corners, and 24 inches o.c., unless otherwise indicated.

3. Galvanize miscellaneous steel trim at exterior locations.

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L. Floor Plate:

1. Fabricate raised-pattern floor plates from rolled-steel floor plate thickness and pattern as follows:

a. Thickness: 1/4 inch.

b. Thickness: Or indicated.

c. Pattern: As selected form manufacturer’s standard patterns.

M. Pipe Bollards:

1. Fabricate pipe bollards from Schedule 40 steel pipe. Cap one end of bollard with

¼ inch minimum steel plate.

2. Fabricate sleeves for bollard anchorage from pipe with ¼ inch thick steel plate welded to bottom of sleeve.

3. Galvanize all pipe bollards.

N. Finishes, General:

1. Comply with NAAMM “Metal Finishes Manual” for recommendations relative to applying and designing finishes.

2. Finish metal fabrications after assembly.

O. Steel and Iron Finishes:

1. Galvanizing: For those items indicated for galvanizing on the drawings or herein, apply zinc coating by the hot-dip process complying with the following requirements:

a. ASTM A 153 for galvanizing iron and steel hardware.

b. ASTM A 123 for galvanizing both fabricated and unfabricated iron and steel products made of uncoated rolled, pressed, and forged shapes, plates, bars, and strip 0.0299 inch thick or thicker.

2. Preparation for Shop Priming: Prepare uncoated ferrous metal surfaces to comply with minimum requirements indicated below for SSPC surface preparation specifications and environmental exposure conditions of installing metal fabrications:

a. Exteriors and interiors (SSPC Zone 1B): SSPC-SP 6 “Commercial Blast

Cleaning”.

3. Apply shop primer to uncoated surfaces of metal fabrications, except those with galvanized finishes or to be embedded in concrete, sprayed-on fireproofing, or masonry, unless otherwise indicated. Comply with requirements of SSPC-PA 1

“Paint Application Specification No. 1” for shop painting.

P. Aluminum Finishes:

1. Finish designations prefixed by AA and conform to the system established by the

Aluminum Association for designating aluminum finishes.

2. As-Fabricated finish: AA-M10 (Mechanical Finish: as fabricated, unspecified).

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A. Preparation:

1. Coordinate and furnish anchorages, setting drawings, diagrams, templates, instructions, and directions for installing anchorages, including concrete insert sleeves, anchor bolts, and miscellaneous items having integral anchors that are to be embedded in concrete or masonry construction. Coordinate delivery of such items to Project site.

2. Center nosings on tread widths with nosings flush with riser faces and tread surfaces.

3. Set sleeves in concrete with tops flush with finish surface elevations. Protect sleeves from water and concrete entry.

B. Installation, General:

1. Fastening to In-Place Construction: Provide anchorage devices and fasteners where necessary for securing miscellaneous metal fabrications to in-place construction. Include threaded fasteners for concrete and masonry inserts, toggles bolts, through-bolts, lag bolts, wood screws, and other connectors as required. Provide setting drawings, templates, instructions and directions for installation or anchorage devices. Coordinate delivery with other work to avoid delay.

2. Cutting, Fitting, and Placement: Perform cutting, drilling, and fitting required for installing miscellaneous metal fabrications. Set metal fabrication accurately in location, alignment, and elevation; with edges and surfaces level, plumb, true, and free of rack; and measured from established lines and levels.

3. Provide temporary bracing or anchors in formwork for items that are to be built into concrete masonry or similar construction.

4. Field Welding: Comply with the following:

a. Use methods and materials that minimize distortion and develop strength and corrosion resistance of base metals.

b. Obtain fusion without undercut or overlap.

c. Remove welding flux immediately.

d. At exposed connections, finish exposed welds and surfaces smooth and blended so that no roughness shows after finishing, and contour of welded surface matches those adjacent.

e. Pre-assemble items in shop to greatest extent possible to minimize field splicing and assembly. Disassemble units only as necessary for shipping and handling limitations. Clearly mark units for reassembly and coordinate installation.

f. Form expose work true to line and level with accurate angles and surfaces and straight sharp edges. Ease exposed edges to a radius of approximately

1/32 inch unless otherwise shown. Form bent metal corners to smallest radius possible without causing grain separation or otherwise impairing work.

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g. Weld corners and seams continuously, complying with AWS recommendations.

h. Form exposed connections with hairline joints, flush and smooth, using concealed fasteners wherever possible. Use exposed fasteners of type shown, or, if not shown, use Phillips flat-head (countersunk) screws or bolts.

Locate joints where least conspicuous.

i. Cut, reinforce, drill and tap miscellaneous metal work as required to receive hardware and other similar items.

j. Corrosion Protection: Coat concealed surfaces of aluminum that will come into contact with grout, concrete, masonry, wood, or dissimilar metals with a heavy coat of bituminous paint.

C. Setting Loose Plates:

1. Clean concrete and masonry bearing surfaces of bond-reducing materials, and roughen to improve bond to surfaces. Clean bottom surface of bearing plates.

2. Set loose leveling and bearing plates on wedges or other adjustable devices.

After the bearing members have been positioned and plumbed, tighten the anchor bolts. Do not remove wedges or shims, but if protruding, cut off flush with the edge of the bearing plate before packing with grout.

a. Use non-shrink grout in concealed locations, not exposed to moisture; use non-shrink, non-metallic grout in exposed locations unless otherwise indicated.

b. Pack grout solidly between bearing surfaces and plates to ensure that no voids remain.

D. Installing Pipe Bollards:

1. Anchor bollards in concrete with pipe sleeves preset and anchored into concrete. After bollards have been inserted into sleeves, fill annular space between bollard and sleeve solidly with non-shrink, non-metallic grout; mixed and placed to comply with grout manufacturer’s directions.

2. Fill bollards solidly with concrete, mounding top surface.

E. Adjusting and Cleaning:

1. Touchup Painting: Cleaning and touchup painting of field welds, bolted connections, and abraded areas of the shop paint on miscellaneous metal is specified in Division 9, Section “Painting”.

2. For galvanized surfaces, clean welds, bolted connections, and abraded areas;

apply galvanizing repair paint to comply with ASTM A 780.

End of Section- 05500

16 Division 05 - Metals

SECTION 05510- METAL STAIRS AND HANDRAILS

1. This Section includes the following:

a. Straight run, steel-framed stairs.

b. Steel pipe handrails and railing systems attached to metal stairs.

c. Steel pipe handrails attached to walls adjacent to metal stairs.

d. Steel pipe handrails where indicated.

e. Stainless-steel pipe and tube handrails and railings.

B. Related Sections:

1. Division 5, Section “Metal Fabrications”

2. Division 9, Section “Painting”

C. Summary:

2. Work under this Section includes metal stairs and all items of miscellaneous structural steel and other miscellaneous metal items specified herein or otherwise inferred or required for construction.

a. Related Sections:

1. Division 9, Section “Painting”.

D. Performance Requirements:

1. Structural Performance of Stairs: Capable of withstanding a uniform load of 100 lbf per sq. ft. or a concentrate load of 300 lbf on an area of 4 sq. inches located in the center of the tread, whichever produces the greater stress.

2. Platforms of Steel Stairs: Capable of withstanding a uniform load of 100 lbf per

sq. ft.

3. Stair Framing: Capable of withstanding stresses resulting from loads specific above as well as stresses resulting from railing system loads.

4. Structural Performance of Railing Systems: Engineer, fabricate, and install handrails and handrail systems to withstand the following structural loads, without exceeding the allowable design working stress of the materials involved., including anchors and connections. Apply each load to produce the maximum stress in each of the respective components of each metal fabrications.

a. Top Rail of Guardrail System: Capable of withstanding the following laods applied as indicated:

1. Concentrated load of 200 lbf applied at any point and in any direction.

2. Uniform load of 50 lbf per liner foot applied horizontally and concurrently with uniform load of 100 lbf per linear foot applied vertically downward.

3. Concentrated and uniform loads above need to be assumed to act concurrently.

17 Division 05 - Metals

Section 05510- Metal Stairs and Handrails Cont.

b. Handrails Not Serving as Top Rails: Capable of withstanding the following loads applied as indicated:

1. Concentrated horizontal load of 200 lbf applied on a 1 ft. square area at any point.

2. Uniform load of 50 lbf per linear foot applied in any direction.

3. Concentrated and uniform loads above need not be assumed to act concurrently.

c. Infill Area of Guardrail System: Capable of withstanding a horizontal concentrated load of 200 lbf applied to 1 sq. ft. at point in the system including panels, intermediate rails, balusters, or other elements composing the infill area.

d. Stainless Steel: ASCE 8, “Specification for the Design of Cold-Formed

Stainless Steel Structural Members”.

E. Submittals:

2. Shop drawings detailing fabrication and installation of steel stairs. Includes plans, elevations, sections, and details of steel stairs and required connections.

Show anchorages and accessory items. Provide templates for anchors and bolts specified for the installation.

a. For installed steel stairs indicated to comply with certain design loadings, include structural analysis data signed by a qualified professional who was responsible for their preparation.

2. Welder certificates signed by Contractor certifying that welders comply with requirements specified under the Quality Assurance” Article.

F. Quality Assurance:

1. Fabricator Qualifications: Firm experienced in producing steel stairs similar to those indicated for this project and with a record of successful in-service performance and with sufficient production capacity to produce required units without delaying the Work.

2. Installer Qualifications: Arrange for steel stair installation specified in the

Section by a firm experienced in stalling steel stairs similar to those indicated for this Project, with a record of successful in-service performance and with sufficient crews to install required units without causing a delay in the Work.

3. Engineer Qualifications: A professional engineer legally authorized to practice in Kentucky and experience in providing engineering services of the kind indicated that have resulted in the installation of metal stairs (including handrails and railing systems) similar to this Project in material, design, and extent and that has a record of successful in-service units.

4. Welding Standards: Comply with applicable provisions of AWS D1.1, “Structural Welding Code- Steel” and AWS D1.3, “Structural Welding Code-

Sheet Steel”.

18 Division 05 - Metals

a. Certify that each welder has satisfactorily passed AWS qualification tests for welding processes involved and, if pertinent, has undergone recertification.

A. Metals:

a. Metal Surfaces, General: For surfaces exposed to view in the complete

Work, provide materials selected for their surface flatness, smoothness, and freedom from surfaces blemishes. Do not use materials with exposed pitting, seam marks, roller marks, rolled trade names, roughness, or, for flat sheet steel, variations in flatness exceeding those permitted by referenced standards for stretcher-labeled sheet.

b. Steel Plates, Shapes, and Bars: ASTM A 36 (ASTM A 36M).

c. Steel Tubing: Product Type (manufactured method) and as follows:

1. Cold-Formed Steel Tubing: ASTM A 500.

2. Hot-Formed Steel Tubing: ASTM A 501.

3. For exterior installations and where indicated, provide tubing with hot-dip galvanizing coating per ASTM A 53.

d. Steel Pipe: ASTM A 53, standard weight (schedule 40), unless otherwise indicated, or another weight is required by structural loads.

1. Black finish, unless otherwise indicated.

2. Galvanized finish for exterior installations and where indicated.

e. Uncoated Structural Steel Sheet: Product type (manufacturing method), quality grade as follows:

1. Cold-Rolled Structural Steel Sheet: ASTM A 611, grade as follows:

a. Grade A, unless otherwise indicated, or required for design loading.

f. Uncoated Steel Sheet: Commercial quality, product type (manufacturing method) as follows:

1. Cold-Rolled Steel Sheet: ASTM A 366 (ASTM A 36M).

g. Welding Rods and Bare electrodes: Select according to AWS specifications for the metal alloy to be welded.

G. Stainless Steel:

1. Tubing: ASTM A 554, Grade MT 304.

2. Pipe: ASTM A 312/A 312 M, Grade TP 304.

3. Castings: ASTM A 743/A 743 M, Grade CF 8 or CF 20.

4. Rate: ASTM A 666, Type 304.

H. Fasteners:

1. General: Provide plated fasteners complying with ASTM B 633, Class Fe/Zn 25 for electrodeposited zinc coating, for exterior use or where built into exterior walls. Select fasteners for the type, grade, and class required.

19 Division 05 - Metals

2. Bolts and Nuts: Regular hexagon-head type, ASTM A 307, Grade A (ASTM F

568, Property Class 4.6), with hex nuts, ASTM A 563 (ASTM A 663M), and where indicated, flat washers.

3. Lag Bolts: ANSI B 18.2.1 (ANSI B 18.2.3.8M).

4. Plain Washers: Round, carbon steel, ANSI B 18.22.1.

5. Lock Washers: Helical, spring type, carbon steel, ANSI B 18.21.1.

6. Expansion Anchors: Anchor bolt and sleeve assemblies of material indicated below with a capacity to sustain, without failure, a load equal to 6 times the load imposed when installed in unit masonry and equal to 4 times the load imposed when installed in concrete as determined by testing per ASTM E 488 conducted by an independent testing agency.

a. Material: Carbon Steel components, zinc-plated to comply with ASTM B

633, Class Fe/Zn 5.

b. For Stainless steel handrails and railings, use fasteners fabricated from Type

304 or Type 316, stainless steel.

I. Paint:

1. Shop Primer for Ferrous Metals: Fast-curing, lead and chromate-free, universal modified-alkyd primer complying with performance requirements of FS TT-P-

664, selected for good resistance to normal atmospheric corrosion, compatible with finish of paint systems indicated, and capability to provide a sound foundation for field-applied topcoat despite prolonged exposure.

J. Concrete fill and Reinforcing materials:

1. Concrete Materials and Properties: Comply with requirements of division 3, Section “Cast-In-Place Concrete” for normal-weight, ready-mixed concrete with a minimum 28 day compressive strength of 4,000 psi, unless higher strengths are indicated.

2. Reinforcing Bars: ASTM A 615, Grade 60 (ASTM A 615M, Grade 400), unless otherwise indicated.

K. Fabrication, General:

1. Form steel stairs from materials of size, thickness, and shapes indicated, but not less than that needed to comply with performance requirements indicated. Work to dimensions indicated or accepted on shop drawings, using proven details of fabrication.

2. Form exposed work true to line and level with accurate angles and surfaces, and straight sharp edges.

3. Shear and punch metal cleanly and accurately.

4. Remove sharp and rough areas on exposed surfaces.

5. Ease exposed edges to a radius of 1/32 inch, unless otherwise indicated. Form bent-metal corners to smallest radius possible without causing grain separation or otherwise impairing work.

20 Division 05 - Metals

6. Weld corners and seams continuously to comply with the following:

a. Use materials and methods that minimize distortion and develop strength and corrosion resistance of base metals.

b. Obtain fusion without undercut or overlap.

c. Remove welding flux immediately.

d. At exposed connections, finish exposed welds and surfaces smooth and blended so that no roughness shows after finishing, and welded surface matches contours of adjoining surfaces.

7. Form exposed connections with hairline joints, flush and smooth, using concealed fasteners wherever possible. Use exposed fasteners of type shown, or, if not shown, use Phillips flat-head (countersunk) screws or bolts. Locate joints where least conspicuous.

8. Shop Assembly: Pre-assemble items in shop to greatest extent possible to minimize field splicing and assembly. Disassemble units only as necessary for shipping and handling limitations. Clearly mark units for reassembly and coordinate installation.

L. Woven Wire Panels:

1. Basis-of-Design or equal to the following:

a. Calwire (California Wire Products Corporation), Type 202 Rail in-fill panels with #10 W&M gauge steel wire in 2 inch square mesh, welded to angle frames.

b. Acorn Wire and Iron Works.

c. Folding Guard.

2. Supply with factory painted finish.

M. Steel-Framed Stairs:

1. General: Construct stairs to conform to sizes and arrangements indicated. Join pieces together by welding, unless otherwise indicated. Provide complete stair assemblies, including metal framing, hangers, columns, handrails, railing systems, newels, balusters, struts, clips, brackets, bearing plates, or other components necessary for the support of stairs and platforms, and as required to anchor and contain the stairs on the supporting structure.

a. NAAMM Stair Standard: Comply with “Recommended Voluntary

Minimum Standards for Fixed Metal Stairs”, in NAAMM “Metal Stair

Manual” for class of stair designated, except where more stringent requirements are indicated.

1. Commercial Class, unless otherwise indicated.

2. Stair Framing: Fabricate stringers of structural steel channels, plates, or a combination thereof, as indicated. Provide closures for exposed ends of stringers. Construct platforms of structural steel channel headers and miscellaneous framing members as indicated. Bolt and weld headers to stringers; bolt or weld newels and framing members to stringers and headers. If using bolts, fabricate and joint so bolts are not exposed on finish surfaces.

21 Division 05 - Metals

a. Where masonry, structural steel or light gauge steel framing walls support steel stairs, provide temporary supporting struts designed for erecting steel stair components before installing walls.

3. Metal Pan Risers, Subtreads, and Subplatforms: Shape metal pans for risers and

Subtreads to conform to configuration shown. Provide thickness of structural steel sheet for metal pans indicated, but not less than that required to support total design loading.

a. Form metal pans of uncoated cold-rolled steel sheet, unless otherwise indicated.

b. Directly weld risers and Subtreads to stringers; locate welds on side of metal pans to be concealed by concrete fill.

c. Shape metal pans to include nosing integral with riser.

d. Provide Subplatforms of configuration and construction indicated; if not indicated, use same metal as risers and Subtreads, in thickness required to support design loading. Attach subplatform to platform framing members with welds.

1. Smooth Soffit Construction: Construct subplatforms with smooth soffits.

N. Steel Pipe Handrails and Systems:

1. General: Fabricate pipe handrails and railing systems to comply with requirements indicated for design, dimensions, details, finish, and member sizes, including wall thickness of pipe, post spacing, and anchorage, but not less than required to support design loads.

2. Interconnected railing and handrail members by butt-welding with internal connections, at fabricator’s option, unless otherwise indicated.

a. At tee and cross interconnections, cope ands of intersecting members to fit contour of pipe to which end is being joined, and weld smooth all around.

3. Form changes in direction of handrails and rails as follows:

a. By welding in place prefabricated flush elbow fittings.

4. Close exposed ends of pipe welding prefabricated fittings, except where clearance of end of pipe and adjoin wall surface is 1/4 inch or less.

5. Brackets, Flanges, Fittings and Anchors: Provide wall brackets, end closers, flanges, miscellaneous fittings, and anchors for interconnections of pipe and attachment of handrails and railing system to other work. Furnish inserts and other anchorage devices for connecting handrails and railing systems to concrete, wall framing or masonry work. Connect railing posts to stair framing by direct welding, unless otherwise indicated.

6. Fillers: Provide steel sheet or plate fillers of thickness and size indicated or required to support structural loads of handrails where needed to transfer wall bracket or welded posts loads through wall finishes to structure or, if welded posts, to stair structure. Size fillers to suit wall finish thickness. Size fillers to produce adequate bearing to prevent bracket rotation and overstressing if substrate.

22 Division 05 - Metals

7. For non-galvanized steel handrails and railing systems, provide non-galvanized ferrous metal fittings, brackets, fasteners, and sleeves, except galvanized anchors embedded in exterior masonry or concrete construction.

O. Steel finishes:

1. General: finish metal stairs after assembly.

a. Comply with NAAMM “Metal finishes Manual” for recommendations on application and designations of finishes.

2. Preparation for Shop Priming: Prepare uncoated ferrous metal surface to comply with requirements indicated below for SSPC surface preparation specifications and environmental conditions of installed units:

a. Interiors (SSPC Zone 1A): SSPC SP 3 “Power Tool Cleaning”.

3. Apply shop primer to uncoated surfaces, except those with galvanized finish or those to be embedded in concrete, sprayed-on fireproofing, or masonry, unless otherwise indicated. Comply with requirements of SSPC-PA 1 “Paint

Application Specification No. 1” for shop painting.

4. Provide finish paint system in accordance with Division 9, Section “Painting”.

P. Roof Ladders (Fixed):

1. Construct fixed roof ladders to dimensions as indicated on the drawings.

2. Construct all fixed roof ladder of galvanized materials as described herein.

3. Ladders must meet all Occupational Safety & Health Administration (OSHA) and General Services Administration (GSA) requirements.

A. Stainless Steel Finishes:

1. Remove or blend tool and die marks and stretch lines into finish.

2. Grind and polish surfaces to produce uniform, directionally textured polish finish indicated, free of cross scratches. Run grain with long dimension of each piece.

3. Bright, Directional Polish: No.4 finish.

4. When polishing is completed, passivate and rinse surfaces. Remove embedded foreign matter and leave surface chemically clean.

B. Preparation:

1. Coordinate and furnish anchorages, setting…