05120-qrs.doc

SECTION 05120PRIVATE

STRUCTURAL STEEL

PART 1 -

GENERAL

1.01

SECTION INCLUDES

A.

Structural steel framing members, and support members.

B.

Base plates.

C.

Grouting under base plates.

1.02

REFERENCES

A. AISC ‑ Code of Standard Practice ‑ Manual of Steel Construction – Allowable

Stress Design (ASD).

ASTM A36/A36M ‑ Structural Steel.

ASTM A53 ‑ Hot‑Dipped, Zinc‑coated Welded and Seamless Steel Pipe.

D.

ASTM A123 ‑ Zinc (Hot Dipped Galvanized) Coatings on Iron and Steel Products.

E.

ASTM A307 ‑ Carbon Steel Externally Threaded Standard Fasteners.

F.

ASTM A325 ‑ High Strength Bolts for Structural Steel Joints.

G.

ASTM A500 ‑ Cold‑Formed Welded and Seamless Carbon Steel Structural Tubing in Round and Shapes.

H.

ASTM A563 ‑ Carbon and Alloy Steel Nuts.

I.

AWS A2.4 ‑ Symbols for Welding, Brazing, and Nondestructive Examination.

J.

AWS D1.1 ‑ Structural Welding Code.

K.

SSPC (Steel Structures Painting Council) ‑ Painting Manual.

1.03

SUBMITTALS FOR REVIEW

Section 01300 – Submittals

1.

Connections not detailed on the drawings.

2.

Indicate welded connections with AWS A2.0 welding symbols. Indicate net weld lengths.

1.04

QUALITY ASSURANCE

A. Fabricate structural steel members in accordance with AISC Code of Standard

Practice.

Perform Work in accordance with AISC Section 10.

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PRODUCTS

2.01

MATERIALS

Structural Steel Members: ASTM A36/A36M.

Structural Tubing: ASTM A500, Grade B.

Pipe: ASTM A53, Grade B.

Bolts, Nuts, and Washers: ASTM A325 bolts, ASTM A563 nuts, galvanized to ASTM A123 for galvanized structural members.

Anchor Bolts: ASTM A307.

F.

Welding Materials: AWS D1.1; type required for materials being welded.

G.

Grout: Non‑shrink type, pre‑mixed compound consisting of non‑metallic aggregate, cement, water reducing and plasticizing additives, capable of developing a minimum compressive strength of 7,000 psi at 28 days.

H.

Shop and Touch‑Up Primer: SSPC 15, Type 1, red oxide.

2.02

FABRICATION

Continuously seal joined members by continuous welds. Grind exposed welds smooth.

Fabricate connections for bolt, nut, and washer connectors.

Develop required camber for members.

2.03

FINISH

Prepare structural component surfaces in accordance with SSPC SP 3.

Shop prime structural steel members. Do not prime surfaces that will be field welded, in contact with concrete, and high strength bolts.

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EXECUTION

3.01

ERECTION

Allow for erection loads, and for sufficient temporary bracing to maintain structure safe, plumb, and in true alignment until completion of erection and installation of permanent bracing.

Field weld components indicated on Drawings.

Field connect members with threaded fasteners; torque to required resistance.

Do not field cut or alter structural members without approval of Architect/Engineer.

After erection, prime welds, abrasions, and surfaces not shop primed, except surfaces to be in contact with concrete.

Grout under base plates in accordance with Section 3300. Trowel grouted surface smooth, splay neatly to 45 degrees.

3.03

ERECTION TOLERANCES

Maximum Variation From Plumb: 1/4 inch per story, non‑cumulative.

Maximum Offset From True Alignment: 1/4 inch.

PART 4 - MEASUREMENT AND PAYMENT

4.01

MEASUREMENT

A.

The work specified herein will not be measured for payment.

4.02

PAYMENT

This work is incidental to other items in this contract and direct separate item payment will not be made.

END OF SECTION

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