SECTION COLD-FORMED METAL FRAMING

Transcription

1 SECTION PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section Includes: Lightgage structural metal studs in exterior wall systems used as masonry veneer backup -up. B. Related Sections: 1. Section Metal Fabrications: steel angles. 2. Section Gypsum Board Assemblies: non-loadbearing partition studs and gypsum sheathing. 1.3 SYSTEM DESCRIPTION A. Masonry Veneer: The exterior non-load-bearing curtain wall system shall be designed to withstand both positive and negative pressure with a maximum deflection of L/600 of stud span. If stud span for 6" and 8" 18 gage stud exceed L/600, either increase stud gage, decrease stud spacing, or add light-gage bracing to control deflection to L/ SUBMITTALS A. Product Data: Submit in accordance with SECTION SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES. Include manufacturer's specifications, load tables, dimension diagrams, anchor details, installation instructions for products to be used in lightgage framing work, and type and location of fasteners. Describe materials and finish, product criteria, and limitations. B. Structural Calculations: Submit structural calculations prepared by manufacturer for review by project engineer. 1. Description of design criteria. 2. Engineering analysis depicting stress and deflection (stiffness) requirements for each framing application. 3. Selection of framing components and accessories. 4. Verification of attachments to structure and adjacent framing components. 5. Sealed by a professional engineer registered in the state where the project is located. 6. Engineer shall have a minimum of 5-years experience with projects of similar scope. C. Shop Drawings: Submit in accordance with SECTION SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES. Drawings shall incorporate fabrication and erection details. 1.5 QUALITY ASSURANCE A. All structural members shall be designed in accordance with AISI "Specifications for the Design of Cold- Formed Steel Structural Members", latest edition. B. Qualifications: Welders and welding procedures shall comply with the requirements of ANSI/AWS D1.3 Structural Welding Code. VLK Architects, Inc.,

2 1.6 DELIVERY AND STORAGE A. Protect metal members from rusting and damage. Deliver to project site in manufacturer's containers or bundles, fully identified with name, brand, type and grade. Store off the ground in a dry, ventilated space. PART 2 - PRODUCTS 2.1 MATERIALS A. Lightgage Steel Framing: Basis of Design ClarkDietrich Building Systems (phone web site: ASTM A 653, Provide Metal Framing, 18 gage minimum with 1-5/8 flange minimum, structural stud framing members. Refer to structural drawings for specific size, type, and locations of framing which may be used on the project. B. Substitutions: Under provisions of SECTION PRODUCT OPTIONS. Other acceptable manufacturer's with products of equal substance and function include: Marino\Ware MarinoWVare Superior Steel Components The Steel Network C. Furnish bridging and bracing members shown or required for a complete and structurally sound installation. D. Track: Formed steel; channel shaped; same width and finish as studs, tight fit; 18 gage thick, solid web. 2.2 ACCESSORIES A. Slide Clips: ASTM A 653, Grade A, galvanized metal clip. 1. ASTM A 653, Grade C, galvanized metal clip. 2. Designed and manufactured for attachment of metal stud framing to edge of structural steel framing. 3. Permits differential vertical movement between stud and floor or roof structure. 4. Clip and its connection to structure shall be adequate to safely brace metal studs to resist design lateral load of at least 330 pounds (allowable stress increase permitted by Building Code already taken into account). B. Bracing and Furring: Formed sheet steel, thickness determined for conditions encountered, manufacturer's standard shapes, same finish as framing members. C. Bridging: 1-1/2" C.R. channels, 16 ga; same finish as framing members. D. Plates, Gussets, Clips: Formed sheet steel, thickness determined for conditions encountered, manufacturer's standard shapes, same finish as framing members. E. Galvanizing Repair Paint: Organic Zinc-Rich coating containing 95% metallic zinc, by weight in the dried film; recognized under the Component Program of Underwriter's Laboratories, Inc. as an equivalent to hotdip galvanizing; conforming to Federal Specification DOD P-21035A for repair of hot-dip galvanizing; as manufactured by ZRC Worldwide (phone web site: Provide Z.R.C. Cold Galvanizing Compound. F. Sealer Gaskets: Closed-cell neoprene foam, 1/4 inch thick, selected from manufacturer s standard widths to match width of bottom track or rim track members as required. 2.3 FASTENERS A. Self-drilling, Self-tapping Screws, Bolts, Nuts and Washers: ASTM A 90, hot dip galvanized. B. Anchorage Devices: Power driven as recommended by manufacturer for size and spacing. C. Welding Electrodes: Comply with AWS standards D1.1 and D1.3. VLK Architects, Inc.,

3 2.4 FABRICATION A. General: Framing components may be prefabricated into panels prior to erection. Cut framing components accurately to fit squarely against abutting members. Hold members firmly in position until properly fastened. Prefabricated panels shall be square and braced against racking. Attach similar components by welding. B. Protective Finishing: Paint abraded surfaces and welds after fabrication, using galvanizing repair paint for galvanized surfaces. 2.5 FINISHES A. All framing members shall be formed from hot-dip galvanized steel, G60 coating, conforming to the requirements of ASTM A 653, Grade C. PART 3 - EXECUTION 3.1 INSTALLATION A. General: Install steel framing members and accessories in accordance with the manufacturer's instructions and the erection drawings. Spacing of studs shall not exceed 16" o.c. B. Install sealer gaskets at the underside of wall bottom track or rim track and at the top of foundation wall or slab at stud or joist locations. C. Securely anchor track to floor and overhead structure or member. Seat studs squarely in the track with the stud flange securely attached to the flanges of both upper and lower track. 1. Attach structural components by welding, bolting or with self-drilling screws. 2. Wire tying of framing components in structural applications will not be permitted. D. Touch-up Painting: Immediately after erection, clean field welds, bolted connections, and abraded areas of shop paint and paint exposed areas with same material used for shop painting. Apply by brush or spray to provide a minimum dry film thinness of 2.0 mils. For galvanized surfaces, apply galvanizing repair paint. E. Construct corners using minimum three studs. Double stud at wall opening, door, and window jambs. F. Provide vertical stud within 12 inches of jamb for brick anchor attachment at openings. Reference BIA Technical Note 28B. G. Provide rows of horizontal bridging welded in place at spacing recommended by stud manufacturer to resist lateral forces and stud rotation. 3.2 TOLERANCES A. Maximum Variation from True Position: ±1/8" from plan location. B. Maximum Variation of any Member from Plane: 1/8" in 10 feet. END OF SECTION VLK Architects, Inc.,

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5 SECTION PART 1 - GENERAL 1.1 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section. 1.2 SUMMARY A. Section Includes: Miscellaneous metal work and related items. B. Related Sections: 1. Section Folding Fire Doors 2. Section Projection Screens 1.3 PERFORMANCE REQUIREMENTS A. Structural Performance of Stairs: Provide metal stairs and support connections capable of withstanding the effects of gravity loads and the following loads and stresses within limits and under conditions indicated: 1. Uniform Load: 100 lbf/sq. ft. 2. Concentrated Live Load: 300 lbf applied on an area of 4 sq. in. 3. Uniform and concentrated loads need not be assumed to act concurrently. 4. Limit deflection of treads, platforms, and framing members to L/360 or 1/4 inch, whichever is less. B. Structural Performance of Railings: Provide railings capable of withstanding the effects of gravity loads and the following loads and stresses within limits and under conditions indicated: 1. Handrails: a. Uniform load of 50 lbf/ft. applied in any direction. b. Concentrated load of 250 lbf applied in any direction. c. Uniform and concentrated loads need not be assumed to act concurrently. 2. Top Rails of Guards: a. Uniform load of 50 lbf/ft. applied in any direction. b. Concentrated load of 250 lbf applied in any direction. c. Uniform and concentrated loads need not be assumed to act concurrently. 3. Infill of Guards: 1.4 SUBMITTALS a. Concentrated load of 50 lbf applied horizontally on an area of 1 sq. ft. b. Infill load and other loads need not be assumed to act concurrently. A. Shop Drawings: Submit in accordance with SECTION SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES. Include details of each metal fabrication, including setting drawings for anchor bolts and other required anchors. B. Submit structural calculations prepared by manufacturer for review by project engineer. Shop drawings and calculations shall be sealed by a professional engineer registered in the State of Texas. VLK Architects, Inc.,

6 PART 2 - PRODUCTS 2.1 MATERIALS A. Steel: ASTM A 36, shapes, plates and bars. B. Threaded Fasteners: ASTM A 307, Grade A, bolts and nuts. C. Stud Anchors: Provide headed stud anchors with a smooth shank of carbon steel with a minimum tensile strength of 60,000 psi, as manufactured by Nelson Stud Welding Div. or KSM Welding Systems Div. D. Expansion Bolts: Fed. Spec. FF-S-325, Group II, Type A, Class 1. Provide Hilti Kwik-bolt or Ramset Trubolt stud anchors. E. Galvanizing Repair Paint: Organic Zinc-Rich coating containing 95% metallic zinc, by weight in the dried film; recognized under the Component Program of Underwriter's Laboratories, Inc. as an equivalent to hotdip galvanizing; conforming to Federal Specification DOD P-21035A for repair of hot-dip galvanizing; as manufactured by ZRC Worldwide, Marshfield, MA (phone web site: Provide Z.R.C. Cold Galvanizing Compound. F. Stainless Steel: Grade and type designated below for each form required: 1. Pipe: ASTM A 312, Grade TP Tubing: ASTM A 312, Grade MT Castings: ASTM A 743, Grade CF 8 or CF Plate and Sheet: ASTM A 240 or ASTM A 666, Type For stainless steel railings, provide fasteners fabricated from type 304 stainless steel. G. Prefinished Aluminum Decorative Tubes: Provide prefinished 2 x 6 aluminum tubes in lengths as shown on drawings. Color(s) as scheduled in SECTION COLOR SCHEDULE. 2.2 FABRICATION A. Fabricate and assemble metal work in the shop to the greatest extent possible. 1. Metal surfaces shall be clean and free of mill scale and rust pitting, well-formed to shape and size with sharp lines and angles. Shearing and punching shall leave clean true lines and surfaces. Exposed ends and edges shall be milled smooth with corners slightly rounded. 2. Weld shop connections to the extent practical; finish exposed welds smooth. Weld joints shall be flush. 3. Cut, drill or punch holes; do not make or enlarge by burning. Provide holes where required for connecting the work of other trades. 4. Conceal fastenings where practical. Thickness of metal and method of assembly and support shall give ample strength and rigidity. 5. Assemble parts so that joints are tight, members are in good alignment, and the finished work reproduces the drawing details as intended. 6. Stud Anchors: Weld stud anchors to miscellaneous shapes using welding equipment and procedures recommended by the manufacturer of the stud anchors used. B. Shop Painting: 1. Carbon steel surfaces shall be cleaned, degreased, and shop coated with a straight alkyd, zinc chromate, rust inhibitive paint applied by brush or spray. Steel to be encased in concrete need not be painted. 2. Aluminum surfaces to be in direct contact with concrete and masonry shall be shop coated with zinc chromate primer. C. Galvanizing: Provide a zinc coating for those items indicated or specified to be galvanized, as follows: 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 ⅛" -thick and heavier, and for galvanizing assembled steel products. VLK Architects, Inc.,

7 PART 3 - EXECUTION 3.1 INSTALLATION A. Deliver, store and erect metal work in such manner that the parts are not damaged or deformed. Install the work true to line, plumb, level, in proper alignment with other work, and free of sags, buckles and other objectionable defects. Anchorage shall be adequate to safely resist all stresses to which the work will normally be subjected. B. Touch-Up Painting: Immediately after erection, clean field welds, bolted connections, and abraded areas of shop paint and paint exposed areas with same material used for shop painting. Apply by brush or spray to provide a minimum dry film thickness of 2.0 mils. For galvanized surfaces, apply galvanizing repair paint. 3.2 MISCELLANEOUS METAL SCHEDULE A. General: The following is a general list of the metal work to be furnished under this section of the specifications. Other items of miscellaneous metal work shown and noted on the drawings and not mentioned elsewhere in the specifications shall be furnished as though specifically described herein. B. Interior Stainless Steel Handrails: 1. Handrails of round stainless steel tubing and steel plate as detailed. 1-1/2-inch OD stainless steel tube, Type Shop connections shall be electrically welded to the extent practical using stainless steel welding rods. Grind and polish welds to the original finish of the metal and remove weld discolorations on exposed surfaces by electro-chemical methods. 3. Bend tubing to smooth curves without kinks or distortions. Make joints and connections flush and smooth. 4. All exposed mechanical fasteners used in the assembly of the handrails shall be stainless steel. C. Roof Curbs: Fabricate curbs of steel angles, channels and plates at roof openings for ducts, exhaust fans and other set-on items. 1. Miter and weld corners. 2. Bolt or weld curbs to roof framing members. D. Storefront and Curtainwall Bracing: Provide braces of steel angles, channels and plates to reinforce and stiffen the head of the aluminum storefront framing. E. Track Supports: Provide framing and brackets of steel shapes as detailed to support curtain track, accordion folding partition, folding panel partition, or overhead barrier-free lift track. 1. Erect to be level, straight and rigid. 2. Punch for mounting bolts as required. F. Pipe Rail Supports: Support light support rail of standard black steel pipe with fittings as detailed for the lighting pocket in the ceiling. 1. Hang the support rail from the structure above with braced pipe struts spaced 48" o.c. Rail shall be straight and level. 2. Furnish slip flanges where pipe struts penetrate gypsum board ceiling. G. Roof Edge Angles: Provide steel angles along roof edges to support wood nailers. 1. Weld angles to steel framing unless otherwise indicated. H. Structural Steel Door Frame for Jamb Mounted Rolling Doors: Frames of carbon steel shapes, bars and plates, fully welded, uniform, square, and true, as detailed for the rolling doors. 1. Miter and weld corner joints and grind exposed welds smooth. 2. Weld 14 gage strip anchors to frame jambs, spaced 24" o.c. to work masonry bed joints. 3. Continuously weld exposed joints; grind exposed welds smooth. VLK Architects, Inc.,

8 4. Provide necessary reinforcements and drill and tap as required for finish hardware. 5. Provide steel strap anchors for securing door frames into adjoining masonry. Weld anchors to frame jambs no more than 12" from both bottom and head of frame and space anchors not more than 30" apart. 6. Galvanize exterior structural steel door frames and anchors. I. Miscellaneous Steel Shapes: Channels, wide flange shapes, angles, plates, tubing, connections, and bolts where shown and detailed on Drawings. Hot-dip galvanize where exposed to weather or touching exterior masonry after fabrication. Set mechanical unit frames directly on joists, not on deck. Provide an angle frame supported by structure around all roof penetrations including hatches and ductwork. END OF SECTION VLK Architects, Inc.,