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HomeMy WebLinkAbout74SECTION 05120 - STRUCTURAL STEEL PART 1 - GENERAL 1.1 RELATED DOCUMENTS Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. 1.2 SUMMARY Work of this Section includes fabrication and erection of structural steel work, as shown on drawings specified herein or as required to complete the work of this section. See drawings for schedules, notes, and details showing size and location of members, typical connections, and types of steel required. Structural steel is that work defined in American Institute of Steel Construction (AISC) "Code of Standard Practice" and as otherwise shown on drawings. Miscellaneous Metal Fabrications are specified elsewhere in Division 5. Refer to Division 3 for anchor bolt installation in concrete, Division 4 for anchor bolt installation in masonry. 1.3 SUBMITTALS General: Submit the following in accordance with Conditions of Contract and Division 1 Specification Sections. Fabricator shall include ten calendar days for the structural engineer to review shop drawings. The ten days starts upon the engineer's receipt of the drawings. Fabricator shall include the entity that sent them the shop drawings and shall conclude when the engineer returns the drawings to ty g time in their schedule above and beyond the ten days to allow for transmitting drawings from fabricator to the general contractor to the architect to the engineer and back. g Product data or manufacturer's specifications and installation instructions when requested by the Structural Engineer for following products. Include laboratory test reports and other data to show compliance with specifications (including specified standards). Structural steel (each type), including certified copies of mill reports covering chemical and physical properties. High-strength bolts (each type), including nuts and washers. Include Direct Tension Indicators if used. Structural steel primer paint. Shop drawings prepared under supervision of a licensed Structural Engineer, including complete details and schedules for fabrication and assembly of structural steel members procedures, dures and diagrams. Include details of cuts, connections, camber, holes, and other pertinent data. Indicate welds by standard AWS symbols and show size, len th g , and type of each weld. Provide setting drawings, templates, and directions for installation of anchor bolts and other anchorage's installed as work of other sections. Propose modifications of the steel required to allow erection to conform to OSHA subpart R regulations. The engineer will not review items relating to means and methods of construction. Means and methods of construction is solely the responsibility of the fabricator and erector. The subcontractors shall take all necessary precautions to insure safe working conditions and provide for the public safety during all stages of their work. 1.4 QUALITY ASSURANCE Codes and Standards: Comply with provisions of following, except as otherwise indicated: American Institute of Steel Construction (RISC) "Code of Standard Practice for Steel Buildings and Bridges." Paragraph 4.4 of the above code is hereby modified as follows: Fabricator shall include ten calendars days for the structural engineer to review shop drawings. The ten days starts upon the engineer's receipt of the shop drawings and shall conclude when the engineer returns the drawings to the entity that sent them the drawings. Fabricator shall include time in their schedule above and beyond the ten days to allow for transmitting drawings from fabricator to the contractor to the architect to the engineer and back. The subcontractor may not make claims for delays if the engineer completes their review in the above noted time. AISC "Specification for Structural Steel Buildings, Allowable Stress Design," including "Commentary." AISC "LRFD Specification for Structural Steel Buildings", 1993 including "Commentary." "Specifications for Structural Joints using ASTM A 325 or A 490 Bolts" approved by the Research Council on Structural Connections. American Welding Society (AWS) D1.1 "Structural Welding Code - Steel." ASTM A6, "General requirements for delivery of rolled steel plates, shapes, sheet piling, and bars for structural use." Steel Structures Painting Council "Surface Preparation Specifications" and "Painting System Specifications." OSHA and other governmental regulation that govern the construction process. Qualifications for Welding Work: Qualify welding procedures and welding operators in accordance with AWS "Qualification" requirements. Provide certification that welders have satisfactorily passed AWS qualification tests. If recertification of welders is required, retesting will be Contractors responsibility. Fabricators and Erectors Qualifications: The fabricator and erector shall have satisfactorily completed work of similar scope and shall have necessary skill, equipment, facilities and capacity to fabricate the structural steel and to perform the erection in accordance with the construction schedule and in compliance with requirements of the contract documents and specifications. 1.5 DELIVERY, STORAGE, AND HANDLING Deliver materials to site at such intervals to ensure uninterrupted progress of work. Comply with ASTM A6. Deliver anchor bolts and anchorage devices, which are to be embedded in cast -in-place concrete or masonry, in ample time to not delay work. Store materials to permit easy access for inspection and identification. Keep steel members off ground by using pallets, platforms, or other supports. Protect steel members and packaged materials from erosion and deterioration. If bolts and nuts become dry or rusty, clean and relubricate before use. Do not store materials on structure in a manner that might cause distortion or damage to members or supporting structures. Repair or replace damaged materials or structures as directed. PART 2 -PRODUCTS 2.1 MATERIALS Structural Steel Shapes, Plates, and Bars: See structural drawings. Cold -Formed Steel Tubing: ASTM A 500, Grade B, Fy = 46ksi. Steel Pipe: ASTM A 53, Type E or S, Grade B; or ASTM A 501. Steel Castings: ASTM A 27, Grade 65_35, medium -strength carbon steel. Headed Stud -Type Shear Connectors: ASTM A 108, Grade 1015 or 1020, cold -finished carbon steel with dimensions complying with AISC Specifications. Anchor Rods: ASTM F1554, grade 36 (Fy=36 ksi) and grade 105 (Fy = 105 ksi). See drawings for size and type. High Strength Threaded Fasteners: Heavy hexagon structural bolts, heavy hexagon nuts, and hardened washers, as follows: Quenched and tempered medium -carbon steel bolts, nuts, and washers, complying with ASTM A 325 unless noted otherwise. Electrodes for Welding: E7OXX, compatible with base metal. Comply with AWS code. Structural Steel Primer Paint: Fabricator's standard gray rust -inhibiting primer. 2.2 FABRICATION Shop Fabrication and Assembly: Fabricate and assemble structural assemblies in shop to greatest extent possible. Fabricate items of structural steel in accordance with AISC Specifications and as indicated on final shop drawings. Provide camber in structural members where indicated. Properly mark and match -mark materials for field assembly. Fabricate for delivery sequence that will expedite erection and minimize field handling of materials. Where finishing is required, complete assembly, including welding of units, before start of finishing operations. Provide finish surfaces of members exposed in final structure free of markings, burrs, and other defects. Connections: General: Minimum connections shall comply with appropriate tables headed "Framed Beam Connections" shown in the AISC 'Manual of Steel Construction." Use seated connections only when they do not interfere with architectural features. Design beam to column connections to minimize eccentric loading of the column. Detail and fabricate unrestrained simple beam end connections to minimize end restraint of the beam. Design all parts of such connections (such as welds, bolts and material) with due consideration for eccentricity. Connections shall be designed and detailed for loads and reactions indicated on structural drawings. Shop connections: Use welded or bolted connections Field connections, Use welded or bolted connections Provide high-strength, threaded fasteners for bolted connections. Modify connection shown on construction documents, if required due to the method of erection, to allow erection to conform to OSHA sub Part R. High -Strength Bolted Construction: Install high-strength threaded fasteners in accordance with AISC "Specifications for Structural Joints using ASTM A 325 or A 490 Bolts." Welded Construction: Comply with AWS Code for procedures, appearance and quality of welds, and methods used in correcting welding work. Welding shall be performed in accordance with a Welding Procedure Specification (WPS) as required in AWS D1.1 and approved by the Structural Engineer of Record. The WPS variables shall be within the parameters established by the filler metal manufacturer. All welds used in members and connections in the Seismic Load Resisting System shall be made with a filler metal that can produce welds that have a minimum Charpy V -Notch (CVN) of 20 ft -Ib at minus 20OF as determined by AWS classification or manufacturer certification. Assemble and weld built-up sections by methods that will produce true alignment of axes without warp. Shear Connectors: Prepare steel surfaces as recommended by manufacturer of shear connectors. Weld shear connectors in field to beams and girders in composite construction. Use automatic end welding of headed stud shear connectors in accordance with manufacturer's printed instructions. Cut, drill, or punch holes perpendicular to metal surfaces. Do not flame -cut holes or enlarge holes by burning. Drill holes in bearing plates. 2.3 SHOP PAINTING General: Shop -paint structural steel as noted below: In warehouses and distribution centers. Do not paint steel used in office buildings. The following members should not be painted: Members or portions of members to be embedded in concrete or mortar. Paint embedded steel that is partially exposed on exposed portions and initial 2 inches of embedded areas only. Surfaces to be welded or high-strength bolted with slip critical type connections. Surfaces scheduled to receive sprayed -on fireproofing. Surfaces receiving shear stud connections. Surface Preparation: After inspection and before shipping, clean steelwork to be painted. Remove loose rust, loose mill scale, and spatter, slag, or flux deposits. Clean steel in accordance with Steel Structures Painting Council (SSPC) as follows: SP -2 "Hand -Tool Cleaning." Remove oil and grease in accordance with SP -1 "Solvent Cleaning." Painting: Immediately after surface preparation, apply structural steel primer paint in accordance with manufacturer's instructions and at a rate to provide dry film thickness of not less than 2.0 mils. Use painting methods that result in full coverage of joints, corners, edges, and exposed surfaces. 2.4 SOURCE QUALITY CONTROL General: The fabricator shall provide effective quality control over all fabrication activities. This shall include ultrasonic, magnetic particle, dye penetrant, x-ray, or other effective means of ensuring that all welds conform to A.W.S. standards. At Owners discretion, materials and fabrication procedures are subject to inspection and tests in mill, shop, and field, conducted by a qualified inspection agency. Such inspections and tests will not relieve Fabricator of responsibility for providing materials and fabrication procedures in compliance with specified requirements. Promptly remove and replace materials or fabricated components that do not comply. 3.1 ERECTION Examine substrates and adjoining construction and conditions under which work is to be installed. Do not proceed with work until corrections to unsatisfactory conditions detrimental to the proper and timely completion of the work. Do not proceed with erection until the controlling contractor has provided evidence, satisfactory to erector, that the site and sub -structure is ready for erection to proceed per OSHA sub -part R. Concrete supporting structural steel must obtain a compressive strength (f'c) of 2,500 psi before setting steel. Concrete supporting structural steel must obtain a compressive strength (f'c) of 3,000 psi before placing concrete on elevated decks. Anchor Rods: Check alignment and elevations of all column supports and location of anchor bolts with transit and level instruments before starting erection. Notify Engineer of any errors. Temporary Shoring and Bracing: Provide temporary shoring and bracing members with connections of sufficient strength to bear imposed loads. Remove temporary members and connections after placement of permanent members and completion of final connections. Provide temporary elements to achieve proper alignment of structures as erection proceeds. The sub -contractor is fully responsible for the design, detailing and adequacy of all temporary bracing, members and methods of construction. The structural steel frame in the completely erected and fully connected state requires interaction with non-structural steel items (steel bar joists and joist girders; metal deck, shear walls, either masonry or concrete) for strength and stability. Temporary supports and braces installed during erection shall remain in place until completion of the installation of the structural steel frame, diaphragm elements and lateral -load resisting system. Temporary Planking: Provide temporary planking and working platforms as necessary to effectively complete work. r and roughen to improve bond to surfaces. Setting Bases and Bearing Plates: Clean concrete and masonry bearing surfaces of bond reducing materials g p Clean bottom surface of plates. adjusting other Set loose and attached base plates and bearing plates for structural members on wedges or of h � g devices. Tighten anchor bolts after positioning and plumbing supported members. Do not remove wedges or shims, but if protruding, cut off flush with edge of base or bearing plate before packing with grout. For proprietary grout materials, comply with manufacturers instructions. Provide access to baseplates to nllow concrete sub -contractor to grout under baseplates. Field Assembly: Set structural frames accurately to lines and elevations indicated. Align and adjust various members forming part of complete frame or structure before permanently fastening. Clean bearing surfaces and other surfaces that will be in permanent contact before assembly. Perform necessary adjustments to compensate for discrepancies in elevations and alignment. Level and plumb individual members of structure within specified AISC tolerances. used in correcting welding work. Welded Construction: Comply with AWS Code for procedures, appearance and quality of welds, and methodsg g Welding shall be performed in accordance with a Welding Procedure Specification (WPS) as required in AWS D1.1 and approved by the Structural Engineer of Record. The WPS variables shall be within the parameters established by the filler metal manufacturer. filler metal that can produce welds that All welds used in members and connections in the Seismic Load Resisting System shall be made with a p have a minimum Charpy V -Notch (CVN) of 20 ft -Ib at minus 20OF as determined by AWS classification or manufacturer certification. Splice members only where indicated and accepted on shop drawings. Gas Cutting: Do not use gas -cutting torches in field for correcting fabrication errors in primary structural framing unless approved by the Structural Engineer. Finish gas -cut sections equal to a sheared appearance when permitted. Touch -Up Painting: Touch up painting of structural steel is not required. 3.2 QUALITY CONTROL General Contractor will engage an independent testing and inspection agency to inspect high-strength bolted and welded connections and to perform tests andP are re test reports. orfs. P P Testing agency shall conduct and interpret tests, state in each report whether test specimens comply with requirements, and specifically state any deviations there from. Provide access for testing agency to places where structural steel work is fabricated or produced so that required inspection and testing can be accomplished. Testing agency may inspect structural steel at plant before shipment. Correct deficiencies in structural steel work that inspections and laboratory test reports have indicated that do not comply with requirements. END OF SECTION 05120 SECTION 05220 - STEEL JOISTS AND JOIST GIRDERS PART 1 - GENERAL 1.1 RELATED DOCUMENTS Drawings and general provisions of Contract including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section. 1.2 SUMMARY Work of this Section includes but is not necessarily limited to steel joists and girders for floor and roof framing, including bridging and other accessories as shown on the drawings, specified herein and as required to complete work related to this Section. Refer to Division 3 Sections for installation of anchorE set in concrete. Refer to Division 4 Sections for installation of anchors set in masonry. 1.3 SUBMITTALS General: Submit the following in accordance with Conditions of Contract and Division 1 Specification Sections. Fabricator shall include ten calendar days for the structural engineer to review shop drawings. The ten days starts upon the. engineers receipt of the shop drawings and shall conclude when the engineer returns the drawings to the entity that sent them the drawings. Fabricator shall include time in their schedule above and beyond the ten days to allow for transmitting drawings from fabricator to the general contractor to the architect to the engineer and back. Product data and installation instructions for each type of joist and accessories. Shop drawings showing layout of joist members, special connections, joining and accessories. Include mark, number, type, location and spacing of joists and bridging. Provide templates or location drawings for installation of anchor bolts and bearing plates. 1.4 QUALITY ASSURANCE General: Provide joists fabricated in compliance with Steel Joist Institute (SJI) "Standard Specifications, Load Tables and Weight Tables for Steel Joists and Joist Girders." Qualification of Field Welding: Qualify welding processes and welding operators in accordance with American Welding Society (AWS) "Structural Welding Code - Steel," AWS D1.1. Welders shall be qualified in accordance with AWS D1.1 for the work performed Inspection: Inspect joists and girders in accordance with SJI "Specifications." 1.5 DELIVERY, STORAGE AND HANDLING Deliver, store and handle steel joists as recommended in SJI "Specifications." Handle and store joists in a n anner to avoid deforming members and to avoid excessive stresses. PART 2 - PRODUCTS 2.1 MATERIALS Steel: Comply with SJI "Specifications" for chord and web sections. Steel with Fy = 55 ksi may be used for joists and girders Steel Bearing Plates: ASTM A 36. Unfinished Threaded Fasteners: ASTM A 307, Grade A, regular hexagon type, low carbon steel. Steel Prime Paint: Comply with SJI "Specifications." 2.2 FABRICATION General: Fabricate steel joists in accordance with SJI "Specification." If the joists are part of an Underwriters Laboratory assembly, joist dimensions must comply with the requirements of that assembly rating. Extended End: Provide extended ends on joists where indicated, or as required to comply with SJI Specifications and OSHA requirements. Extended ends shall be designed for the same loads as the main span of the joist. Top Chord Extension: Provide top chord extensions on joists where indicated, complying with SJI "Specifications" and load tables. Top chord extensions shall be designed for the same loads as the main span of the joist. Bridging: Provide horizontal or diagonal type bridging for joists, complying with SJI Specifications and OSHA requirements. Provide bridging anchors for ends of bridging lines terminating at walls or beams. End Anchorage: Provide end anchorages, including steel bearing plates, to secure joists to adjacent construction, complying with SJI "Specifications." Shop Painting: Remove loose scale, heavy rust, and other foreign materials from fabricated joists and accessories before application of shop paint. Apply one shop coat of steel prime paint to joists and accessories, by spraying, dipping, or other method to provide a minimum continuous dry paint film thickness of 0.50 mil. Paint color to be grey. PART 3 - EXECUTION 3.1 ERECTION General: Do not proceed with erection until the controlling contractor has provided evidence, satisfactory to erector, that the site and sub -structure is ready for erection to proceed pPr OSHA sub -part R. Place and secure steel joists in accordance with SJI "Specifications," OSHA requirements, final shop drawings, and as herein specified. Anchors: Fumish anchor bolts, steel bearing plates, and other devices to be built into concrete and masonry construction. Placing Joists: Do not start placement of steel joists until supporting work is in place and secured. Place joists on supporting work, adjust and align in accurate locations and spacing before permanently fastening. Bridging: Provide bridging, connections, and anchors to ensure lateral stability during construction. Install bridging simultaneously with joist erection, Jefore applying construction loaao. Anchor ends of bridging lines where terminating at walls or beams. Bridging may be removed after the metal floor or roof deck is in place and connected to the joists. The removal of bridging shall comply with the following: Sub -contractor removing bridging is responsible for the costs associated with providing and installing additional bridging noted below. The top chord may be removed without the installation of additional bridging. Bottom chord horizontal bridging may be removed In single locations so long as diagonal bridging is added in the adjacent joist spaces to tie off the horizontal bridging. Diagonal bridging may be removed at single locations so long as horizontal bridging is installed to replace the diagonal bridging. Fastening Joists: Comply with the following: Feld weld joists to supporting steel framework and steel bearing plates where indicated in accordance with SJI "Specifications" unless the drawings require more stringent requirements. Coordinate welding sequence and procedure with placing of joists. Bolt joists to supporting steel framework where required. Use unfinished threaded fasteners for bolted connections, unless otherwise indicated. Limit concentrated loads applied to the top and bottom chord of the joist between panel points or add additional members to stiffen the joist. Touch-up Painting: Touch up painting of steel joists, joist girders, and accessories is not required. 3.2 FIELD QUALITY CONTROL General contractor will retain material testing agency to provide Special Inspections as required by local code and agreed upon with local building official. Correct deficiencies in Work that inspections and test reports have indicated are not in compliance with specified requirements. Testing agency will report test results promptly and in writing to general contractor and engineer. END OF SECTION 05220 0 SECTION 05310 - STEEL DECK PART 1 - GENERAL 1.1 RELATED DOCUMENTS Drawings and general provisions of Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this section. 1.2 SUMMARY Work of this Section includes but is not limited to steel deck units and related accessories for roof and floor applications as shown on the drawings, specified herein and as required to complete the project. The steel roof deck is not designed for the support of below roof elements. Do not support ceilings, light gauge metal framing, light fixtures, ducts, conduit, etc from roof deck. 1.3 SUBMITTALS 'vision 1 Specification ation Sections. Include ten calendars days for the Conditions of Contract and Di General: Submit the following in accordance with Co Pe y structural engineer to review shop drawings. The ten days starts upon the engineer's receipt of the shop drawings and shall conclude when the engineer returns the drawings to the entity that sent them the drawings. Include time in your schedule above and beyond the ten days to allow for transmitting drawings from fabricator to the general contractor to the architect to the engineer and back. Product data including manufacturers specifications and installation instructions for each type of decking and accessories. Shop drawings showing layout and types of deck units, anchorage details, and conditions requifing closure strips, supplementaryframing, sump pans, cant strips, cut openings, special jointing, and other accessories. 1.4 QUALITY ASSURANCE Codes and Standards: Comply with provisions of the following codes and standards, except as otherwise indicated: OSHA and other governmental regulation that govern the construction process. American Iron and Steel Institute (AISI), "Specification for the Design of Cold -Formed Steel Structural Members." American Welding Society (AWS), D1.3 "Structural Welding Code - Sheet Steel." Steel Deck Institute (SDI), "Design Manual for Composite Decks, Form Decks and Roof Decks." Qualification of Field Welding: Use qualified welding processes and welding operators in accordance with "Welder Qualification" procedures of AWS. Welder's certificates must be current and appropriate for the type of welds to be performed. PART 2 - PRODUCTS 2.1 MATERIALS Steel for Painted Metal Deck Units: ASTM A- 611, grade complying with SDI specifications. Steel for Galvanized Metal Deck Units: ASTM A 446, grade to comply with SDI. specifications. Miscellaneous Steel Shapes: ASTM A 36. Sheet Metal Accessories: ASTM A 526, commercial q ualit y, galvanized. End Closures: Flexible rubber closures for underside of deck. Manufacturer's standard product. Galvanizing: ASTM A 525, G60. Repairs to Galvanized Surfaces: Prepare surfaces and repair in accordance with procedures specified in ASTM A 780. Finishes: Provide metal deck with galvanized finish. 2.2 FABRICATION General: Form deck units in lengths to span three or more supports, with flush, telescoped, or nested 2 -inch laps at ends and interlocking or nested side laps, of metal thickness, depth, and width as indicated. See structural drawings for required deck types. Roof Deck Units: Provide deck configurations that comply with SDI "Specifications and Commentary for Steel Roof Deck." Metal Closure Strips: Fabricate metal closure strips, for cell raceways and openings between decking and other construction, of not less than 0.045 -inch min. (18 gage) sheet steel. Form to provide tight -fitting closures at open ends of cells or flutes and sides of decking. PART 3 - EXECUTION 3.1 INSTALLATION General: Do not proceed with erection until the controlling contractor has provided evidence, satisfactory to erector, that the site and sub -structure is ready for erection to proceed per OSHA sub -part R. Install deck units and accessories in accordance with manufacturers recommendations, shop drawings, and as specified herein. Place deck units on supporting steel framework and adjust to final position with ends accurately aligned and bearing on supporting members before permanently fastening to steel. Do not stretch or contract side lap interlocks. Align deck units for entire length of run of cells and with close alignment between cells at ends of abutting units. Place deck units flat and square, secured to adjacent framing without warp or deflection. Do not place deck units on concrete supporting structure until concrete has cured and is dry. Coordinate and cooperate with structural steel erector in locating decking bundles to prevent overloading of structural members. Fastening Deck Units: Fasten roof deck units to steel supporting members by puddle welds as shown in the structural drawings. Puddle weld size shall be as required by SDI for the type of deck used. Comply with AWS requirements and procedures for manual shielded metal are welding, appearance and quality of welds, and methods used in correcting welding work. Mechanical fasteners, either powder -actuated or pneumatically driven, may be used in lieu of welding. Structural Engineer must approve mechanical fasteners. Cutting and Fitting: Cut and neatly fit deck units and accessories around other work projecting through or adjacent to the decking, as shown. Reinforcement at Openings: Provide additional metal reinforcement and closure pieces as required for strength, continuity of decking, and support of other work shown. Joint Covers: Provide metal joint covers at abutting ends and changes in direction of floor deck units, except where taped joints are required. Closure Strips: Provide a metal closure strip at open uncovered ends and edges of roof decking and in voids between decking and other construction. Weld into position to provide a complete decking installation. Install flexible rubber closures in underside of deck. Touch-up painting: Touch up painting of painted metal deck is not required. The steel roof deck is not designed for the support of below roof elements. Do not support ceilings, light gauge metal framing, light fixtures, ducts, conduit, etc from roof deck. 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