.1 American Institute of Steel Construction (AISC) Specifications for Steel Buildings AISC

Transcription

1 STRUCTURAL STEEL FRAMING Page 1 of 3 1 General 1.1 SECTION INCLUDES.1 Structural steel framing and support members 1.2 RELATED SECTIONS.1 Section Metal Fabrications 1.3 REFERENCES.1 American Institute of Steel Construction (AISC) Specifications for Steel Buildings AISC AISC Steel Construction Manual 13 th Edition pp..3 American Welding Society (AWS) D1.1/D1.1M: 2008 Structural Steel Welding Code Steel (with 2009 Errata). 562 pp..4 ASTM International (ASTM) A992 Standard Specification for Structural Steel Shapes. DOI: /A0992_A0992M-06A. ASTM International, West Conshohocken, PA..5 ASTM A53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. DOI: /A0053_A0053M-07. ASTM International, West Conshohocken, PA..6 ASTM A563 Standard Specification for Carbons and Alloy Steel Nuts. DOI: /A A. ASTM International, West Conshohocken, PA..7 ASTM A36 Standard Specification for Carbon Structural Steel. DOI: /A0036_A0036M-08. ASTM International, West Conshohocken, PA..8 ASTM A325 Standard Specification for Structural Bolts, Steel, Heat- Treated, 120/105 ksi Minimum Tensile Strength. DOI: /A ASTM International, West Conshohocken, PA..9 ASTM A500 Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes. DOI: /A0500_A0500M-10. ASTM International, West Conshohocken, PA..10 Research Council on Structural Connections Specifications for Structural Joints Using ASTM A325 or A490 Bolts. RCSC Committee A.1 Specifications. June pp.

2 STRUCTURAL STEEL FRAMING Page 2 of SUBMITTALS.1 Provide fabrication Shop Drawings of all components. Indicate appropriate elevations, dimensions, hole locations, hole diameters, weld sizes, member section descriptions, and finish. 2 Products 2.1 MATERIALS.1 Structural Steel Members (Except Wide Flange Sections): ASTM A36..2 Structural Steel for Wide Flange Sections: ASTM A Structural Tubing: ASTM A500, Grade B..4 Pipe: ASTM A53, Grade B..5 Bolts, Nuts, and Washers: ASTM A325 bolts, ASTM A563 nuts, black, unpainted..6 Welding Materials: AWS D1.1; type required for materials being welded..7 Primer, intermediate, and finish coats will be from the same coatings manufacturer. Prime coats will be compatible with and appropriate for use on surface to be coated. 2.2 FABRICATION.1 Additional fabrication requirements for railings and walkway steel are provided in Section Metal Fabrications..2 Weld shop joints..3 Continuously seal joined members by completing continuous welds. Grind exposed welds smooth..4 Fabricate connections for bolt, nut, and washer connectors, in accordance with AISC Specifications for Steel Buildings, the AISC Steel Construction Manual, and Specifications for Structural Joints using ASTM A325 or A490 Bolts..5 Develop required camber for members..6 Connections will be framed beam connections, in accordance with AISC Specifications for Steel Buildings and the AISC Steel Construction Manual.

3 STRUCTURAL STEEL FRAMING Page 3 of 3.7 Burning holes and notches in members will not be permitted, except when authorized in writing by the Engineer, or as indicated on the Technical Drawings..8 Maintain the contact surfaces of joints free of oil, paint, or any foreign matter. 2.3 FINISH.1 Prepare structural component surfaces in accordance with Society of Protective Coatings Steel Structures Painting Council SP-6..2 Shop-prime structural steel members using two coats of paint. Do not prime surfaces that will be field-welded.3 Prepare members to be hot dipped galvanized in accordance with Drawing S-1. 3 Execution 3.1 INSTALLATION.1 Allow for erection loads, and for sufficient temporary bracing to maintain the structure safe, plumb, and in true alignment until completion of erection and installation of permanent bracing..2 Field-weld components as indicated on the Technical Drawings or Shop Drawings..3 Field-connect members with threaded fasteners; torque to required resistance. Connections will develop the full strength of members, unless indicated otherwise, and in accordance with AISC Specifications for Steel Buildings and Specifications for Structural Joints using ASTM A325 or A490 Bolts..4 Do not field-cut or alter structural members without reviewed by the Engineer..5 After erection, prime welds, bolts, abrasions, and surfaces damaged or not shopprimed. END OF SECTION

4

5 METAL FABRICATIONS Page 1 of 4 1 General 1.1 SECTION INCLUDES.1 Structural steel walkway framing.2 Steel railing 1.2 RELATED SECTION.1 Section Structural Steel Framing 1.3 REFERENCES.1 American Institute of Steel Construction (AISC) Code of Standard Practice for Steel Buildings and Bridges. AISC Committee on the Code of Standard Practice. 80 pp..2 AISC Specifications for Steel Buildings AISC AISC Steel Construction Manual 13 th Edition pp..4 American Welding Society (AWS) D1.1/D1.1M: 2008 Structural Steel Welding Code Steel (with 2009 Errata). 562 pp..5 ASTM International (ASTM) A36 Standard Specification for Carbon Structural Steel. DOI: /A0036_A0036M-08. ASTM International, West Conshohocken, PA..6 Research Council on Structural Connections Specifications for Structural Joints Using ASTM A325 or A490 Bolts. RCSC Committee A.1 Specifications. June pp. 1.4 SUBMITTALS.1 Provide fabrication Shop Drawings of components. Indicate appropriate elevations, dimensions, hole locations, hole diameters, weld sizes, member section descriptions, and finish. 2 Products 2.1 MATERIALS STAIRS AND WALKWAY.1 See Section Structural Steel Framing for structural steel components of fabrications.

6 METAL FABRICATIONS Page 2 of 4.2 Exposed Mechanical Fastenings: Flush countersunk screws or bolts; consistent with design of stair structure..3 Gratings: Welded steel bar grating, ASTM A36 with non-slip nosing on stair treads..1 Thickness: 1½ inches..2 Bearing Bars: 3 / 16 inch, spaced 1 3 / 16 inch on center. 2.2 MATERIALS RAILINGS.1 Comply with Occupational Safety and Health Administration (OSHA) and state and local codes..2 Posts: Steel pipe 1½ inches in diameter, Schedule 80, single unspliced length space of 8 feet (ft) maximum..3 Rails: Steel pipe 1½ inches in diameter, Schedule 40.1 Top Rail: Continuous wherever possible, attached to a minimum of three posts..2 Lower Rails: Single unspliced length between posts..4 Make provisions for expansion and contraction of top rails and toe plate. Expansion joints will be placed at maximum 25-ft intervals..5 Weld, miter, and grind smooth connections..6 Toe plate: 3 / 16 - by 4-inch plate, ASTM A FABRICATION GENERAL.1 Fit and shop-assemble components in the largest practical sections for delivery to the site..2 Fabricate components with joints tightly fitted and secured..3 Continuously seal joined pieces by continuous welds, in accordance with AISC Specifications for Steel Buildings and the AISC Steel Construction Manual..4 Grind exposed joints flush and smooth with adjacent finish surface. Make exposed joints butt-tight, flush, and hairline. Ease exposed edges to a small, uniform radius..5 Exposed Mechanical Fastenings: Flush countersunk screws or bolts; unobtrusively located; consistent with the design of the component, except where specifically noted otherwise.

7 METAL FABRICATIONS Page 3 of 4.6 Supply components required for anchorage of fabrications. Fabricate anchors and related components of same material and finish as fabrication, except where specifically noted otherwise..7 Accurately form components required for anchorage of stairs and landings to each other and to the building structure..8 Fabricate structural steel members in accordance with the AISC Code of Standard Practice, AISC Specifications for Steel Buildings, the AISC Steel Construction Manual, and Specifications for Structural Joints using ASTM A325 or A490 Bolts. 2.4 FABRICATION STAIRS AND LANDINGS.1 Fabricate treads from the steel bar grating..2 Form landings in the same manner as the treads. 2.5 FABRICATION RAILINGS.1 Fit and shop-assemble components in the largest practical sizes for delivery to the site..2 Fabricate components with joints tightly fitted and secured. Provide mechanical fittings to accommodate site assembly and installation..3 Provide anchors, brackets, and bolts required for mounting and anchoring railings..4 Drill condensate drainage holes at bottom and low point of members at locations that will not encourage water intrusion..5 Make exposed joints butt-tight, flush, and hairline. Ease exposed edges to a small, uniform radius..6 Accurately form components to suit stairs and landings, to each other and to the structure..7 Account for expansion and contraction of members and structure movement without damage to connections or members. 2.6 FINISHES.1 Prepare surfaces to be primed in accordance with Society of Protective Coatings Steel Structures Painting Council SP-6..2 Do not prime surfaces where field welding is required..3 Prime-paint items with two coats.

8 METAL FABRICATIONS Page 4 of 4 3 Execution 3.1 INSTALLATION.1 Install components plumb and level, accurately fitted, and free from distortion or defects..2 Provide anchors and structural members required for connecting stairs to the structure..3 Allow for erection loads and for sufficient temporary bracing to maintain true alignment until completion of erection and installation of permanent attachments..4 Field-weld components indicated on the Shop Drawings. Perform field welding in accordance with AWS D1.1, AISC Specifications for Steel Buildings, and the AISC Steel Construction Manual..5 Field-bolt and weld to match shop bolting and welding. Conceal bolts and screws whenever possible. Where not concealed, use flush countersunk fastenings..6 Fasten joints butt-tight, flush, and hairline. Grind welds smooth and flush..7 Obtain approval prior to site cutting or creating adjustments that are not scheduled..8 After erection, prime welds, abrasions, and surfaces that are not shop-primed. END OF SECTION