05210 Steel Joists.pdf

Standard Drawings for Doppler (VHF)

Omni Directional Range (DVOR) Counterpoise June 2020

STEEL JOISTS 05210 - 1

SECTION 05210

STEEL JOISTS

PART 1 - GENERAL

1.1 WORK INCLUDED

Furnish labor, materials, equipment and incidentals necessary to install steel joists, bridging and accessories.

1.2 RELATED WORK COVERED ELSEWHERE

Structural Steel Section 05120

Structural Steel Erections Section 05121

Miscellaneous Metals Section 05500

1.3 SUBMITTALS

Submittals shall be in accordance with general requirements and shall include shop drawings showing the size of steel joist, bearing details and extensions.

1.4 REFERENCES AND STANDARDS

Joist designations for Series K short span joists are the Steel Joist Institute's designation number, as listed in the "Standard Specifications and Load Tables." Joists shall conform to the following specifications and shall be capable of carrying the minimum loads listed in the load tables.

SJI Steel Joist Institute's Specifications and Load Tables, latest edition.

AISC Specifications for Structural Steel Buildings

AWS D1.1 Structural Welding Code-Steel

1.5 DELIVERY HANDLING AND STORAGE

A. Deliver joists at appropriate times to best expedite the construction and cause no delays. Make no deliveries until provisions have been made for storage prior to erection.

B. Store steel joists in upright position, held off of grade by wood supports, and anchored to prevent falling.

1.6 JOB CONDITIONS

Inspect joists upon delivery. Reject damaged joists. Any joist which has one or more chord members bent or crimped will be rejected by the Contracting Officer.

PART 2 - PRODUCTS

2.1 MATERIALS

A. STEEL: Hot rolled or cold formed steel, having a yield strength of 36,000 psi or 50,000 psi as used as a basis for the design stresses prescribed in Section 4 of SJI Specifications. The design of chord sections for K-Series joist shall be based on a yield strength of 50,000 psi. K-Series joists shall be

Standard Drawings for Doppler (VHF)

Omni Directional Range (DVOR) Counterpoise June 2020

STEEL JOISTS 05210 - 2

constructed of one of several steels recognized by the Steel Joists Institute, conforming to the requirements of AISC "Specifications for Structural Steel Buildings", and ASTM A-370.

B. WELDING ELECTRODES: E70

C. SHOP PAINT: Red oxide primer meeting Fed. Spec. TT-P-636.

2.2 FABRICATIONS

A. Joists shall be fabricated in accordance with the Standard Specifications of the Steel Joist Institute and shall conform to their design requirements.

B. Joists shall have the minimum bearing areas as specified by the standard specifications. In no case shall the bearing lengths be less than 4-1/2" when bearing on masonry, or 2-1/2" when bearing on steel.

C. Joists shall be constructed with extended bottom chords where required for suspended ceiling support, and extended top chords where required.

D. Joist seats shall be of the depth noted on the drawings. Unless noted otherwise, series K joists shall have 2-1/2" deep seats.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Lift joists to the structure and distribute to avoid overloading any part of the structure. Space joists to proper dimension. Anchor joist seats and install bridging before any superimposed loads are applied.

B. Fasten steel joists into place with fillet welds on each side of bearing plates at beams or weld plates.

Provide standard masonry anchors for joists bearing into masonry. Tack weld steel joist to bearing members and install bridging. After bridging has been installed, complete anchorage by welding joist seats.

C. Furnish and install continuous bridging to result in completely rigid members. Horizontal bridging shall consist of two (2) continuous horizontal steel members, one attached to the top chord and the other attached to the bottom chord. Bridging members shall have an l/r ratio not exceeding 300.

Diagonal bracing shall consist of steel angles having a l/r ratio not exceeding 200. Angles shall be placed back to back and may be bolted or welded to steel plates attached to top and bottom chords of joist. In no case shall the number of rows of bridging be less than that specified in the SJI

Specifications.

D. Where concentrated loads are applied to either chord of steel joist, provide a 1-1/2" x 1-1/2" x 1/4" steel angle field welded between flanges of top and bottom chords, located at point where load is applied.

E. Where columns are not framed in two directions with structural steel members, provide a steel joist centered on the column on either side, and bolted either to the flange of the longitudinal steel member or to seat brackets welded to the column. Anchor with two (2) 1/2" diameter bolts each joist.

END OF SECTION