Weatherbee, Stephanie

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University of New HampshireUniversity of New Hampshire Scholars' RepositoryDivision 05 – Metals Chapter 5 – Technical Construction andRenovation Standards1-25-2013055100 - Metal StairsSandra Hickeysandra.hickey@unh.eduFollow this and additional works at: https://scholars.unh.edu/pdch_5_05This Article is brought to you for free and open access by the Chapter 5 – Technical Construction and Renovation Standards at University of NewHampshire Scholars' Repository. It has been accepted for inclusion in Division 05 – Metals by an authorized administrator of University of NewHampshire Scholars' Repository. For more information, please contact nicole.hentz@unh.edu.Recommended CitationHickey, Sandra, "055100 - Metal Stairs" (2013). Division 05 – Metals. 4.https://scholars.unh.edu/pdch_5_05/4UNIVERSITY of  NEW HAMPSHIRE    PLANNING, DESIGN AND CONSTRUCTION GUIDELINES January 25, 2013 CHAPTER 5 – TECHNICAL CONSTRUCTION AND RENOVATION STANDARDS METAL STAIRS 05 5100 - 1 SECTION 05 5100 - METAL STAIRS 1.1 SUMMARY A. Section Includes: 1. Preassembled steel stairs with concrete-filled, precast concrete, epoxy-resin-filled, and abrasive-coating-finished formed-metal treads. 2. Industrial-type stairs with steel floor plate or grating treads. 3. Ornamental steel-framed stairs. 4. Steel tube railings attached to metal stairs. 5. Steel tube handrails attached to walls adjacent to metal stairs. 6. Railing gates at the level of exit discharge. 1.2 PERFORMANCE REQUIREMENTS A. Delegated Design:  Design metal stairs, including comprehensive engineering analysis by a qualified professional engineer, using performance requirements and design criteria indicated. B. Structural Performance of Stairs:  Metal stairs shall withstand the effects of gravity loads and the following loads and stresses within limits and under conditions indicated. 1. Uniform Load:  100 lbf/sq. ft. (4.79 kN/sq. m). 2. Concentrated Load:  300 lbf (1.33 kN) applied on an area of 4 sq. in. (2580 sq. mm). 3. Uniform and concentrated loads need not be assumed to act concurrently. 4. Stair Framing:  Capable of withstanding stresses resulting from railing loads in addition to loads specified above. C. Structural Performance of Railings:  Railings shall withstand the effects of gravity loads and the following loads and stresses within limits and under conditions indicated. 1. Handrails and Top Rails of Guards: a. Uniform load of 50 lbf/ ft. (0.73 kN/m) applied in any direction. b. Concentrated load of 200 lbf (0.89 kN) applied in any direction. c. Uniform and concentrated loads need not be assumed to act concurrently. 2. Infill of Guards: a. Concentrated load of 50 lbf (0.22 kN) applied horizontally on an area of 1 sq. ft. (0.093 sq. m). b. Infill load and other loads need not be assumed to act concurrently. D. Seismic Performance:  Metal stairs shall withstand the effects of earthquake motions determined according to ASCE/SEI 7. 1. Component Importance Factor is 1.5. UNIVERSITY of  NEW HAMPSHIRE    PLANNING, DESIGN AND CONSTRUCTION GUIDELINES January 25, 2013 CHAPTER 5 – TECHNICAL CONSTRUCTION AND RENOVATION STANDARDS METAL STAIRS 05 5100 - 2 1.3 SUBMITTALS A. LEED Submittals: 1. Product Data for Credit MR 4.1 and Credit MR 4.2:  Indicating percentages by weight of postconsumer and preconsumer recycled content for products having recycled content.  Include statement indicating costs for each product having recycled content. 1.4 QUALITY ASSURANCE A. Installer Qualifications:  Fabricator of products. B. NAAMM Stair Standard:  Comply with "Recommended Voluntary Minimum Standards for Fixed Metal Stairs" in NAAMM AMP 510, "Metal Stairs Manual," for class of stair designated, unless more stringent requirements are indicated. 1. Preassembled Stairs:  Commercial class. 2. Industrial-Type Stairs:  Industrial class. 3. Ornamental Stairs:  Architectural class. C. Welding Qualifications:  Qualify procedures and personnel according to AWS D1.1/D1.1M, "Structural Welding Code - Steel." 1.5 FERROUS METALS A. Recycled Content of Steel Products:  Provide products with average recycled content of steel products so postconsumer recycled content plus one-half of preconsumer recycled content is not less than 25 percent. B. Steel Plates, Shapes, and Bars:  ASTM A 36/A 36M. C. Steel Tubing:  ASTM A 500 (cold formed). D. Rolled-Steel Floor Plate:  ASTM A 786/A 786M, rolled from plate complying with ASTM A 36/A 36M or ASTM A 283/A 283M, Grade C or D. E. Steel Bars for Grating Treads:  ASTM A 36/A 36M or steel strip, ASTM A 1011/A 1011M or ASTM A 1018/A 1018M. F. Cast Iron:  Either gray iron, ASTM A 48/A 48M, or malleable iron, ASTM A 47/A 47M, unless otherwise indicated. G. Uncoated, Cold-Rolled Steel Sheet:  ASTM A 1008/A 1008M, either commercial steel, Type B, or structural steel, Grade 25 (Grade 170), unless another grade is required by design loads; exposed. H. Uncoated, Hot-Rolled Steel Sheet:  ASTM A 1011/A 1011M, either commercial steel, Type B, or structural steel, Grade 30 (Grade 205), unless another grade is required by design loads. UNIVERSITY of  NEW HAMPSHIRE    PLANNING, DESIGN AND CONSTRUCTION GUIDELINES January 25, 2013 CHAPTER 5 – TECHNICAL CONSTRUCTION AND RENOVATION STANDARDS METAL STAIRS 05 5100 - 3 I. Galvanized-Steel Sheet:  ASTM A 653/A 653M, G90 (Z275) coating, either commercial steel, Type B, or structural steel, Grade 33 (Grade 230), unless another grade is required by design loads. J. Perforated Metal:  Cold-rolled steel sheet, ASTM A 1008/A 1008M, or hot-rolled steel sheet, ASTM A 1011/A 1011M, commercial steel Type B. K. Perforated Metal:  Galvanized-steel sheet, ASTM A 653/A 653M, G90 (Z275) coating, commercial steel Type B. 1.6 ABRASIVE NOSINGS A. Cast-Metal Units:  Cast aluminum, with an integral abrasive, as-cast finish consisting of aluminum oxide, silicon carbide, or a combination of both.  Fabricate units in lengths necessary to accurately fit openings or conditions. B. Extruded Units:  Aluminum units with abrasive filler consisting of aluminum oxide, silicon carbide, or a combination of both, in an epoxy-resin binder.  Fabricate units in lengths necessary to accurately fit openings or conditions. 1.7 PRECAST CONCRETE TREADS A. Concrete Materials and Properties:  Comply with requirements in Chapter 5, Division 03, Section 033000 for normal-weight, ready-mixed concrete with a minimum 28-day compressive strength of 5000 psi (35 MPa) and a total air content of not less than 4 percent or more than 6 percent. B. Reinforcing Wire Fabric:  Galvanized, welded wire fabric, 2 by 2 inches (50 by 50 mm) by 0.062-inch- (1.6-mm-) diameter wire; comply with ASTM A 185/A 185M and ASTM A 82/A 82M, except for minimum wire size. 1.8 STEEL-FRAMED STAIRS A. Manufacturers:   1. Alfab, Inc. 2. American Stair, Inc. 3. Sharon Companies Ltd. (The). 4. The University prefers local and regional manufacturers within 500 miles of the campus. B. Stair Framing: 1. Fabricate stringers of steel plates or channels. a. Provide closures for exposed ends of channel stringers. 2. Construct platforms of steel plate or channel headers and miscellaneous framing members as needed to comply with performance requirements. UNIVERSITY of  NEW HAMPSHIRE    PLANNING, DESIGN AND CONSTRUCTION GUIDELINES January 25, 2013 CHAPTER 5 – TECHNICAL CONSTRUCTION AND RENOVATION STANDARDS METAL STAIRS 05 5100 - 4 3. Weld or bolt stringers to headers; weld or bolt framing members to stringers and headers.  If using bolts, fabricate and join so bolts are not exposed on finished surfaces. 4. Where stairs are enclosed by gypsum board shaft-wall assemblies, provide hanger rods or struts to support landings from floor construction above or below.  Locate hanger rods and struts where they will not encroach on required stair width and will be within the fire-resistance-rated stair enclosure. 5. Where masonry walls support metal stairs, provide temporary supporting struts designed for erecting steel stair components before installing masonry. C. Metal-Pan Stairs:  Form risers, subtread pans, and subplatforms to configurations shown from steel sheet of thickness needed to comply with performance requirements but not less than 0.067 inch (1.7 mm). 1. Steel Sheet:  Uncoated cold-rolled steel sheet. 2. Directly weld metal pans to stringers; locate welds on top of subtreads where they will be concealed by concrete fill.  Do not weld risers to stringers. 3. Shape metal pans to include nosing integral with riser. 4. Attach abrasive nosings to risers. D. Metal Bar-Grating Stairs:  Form treads and platforms to configurations shown from metal bar grating; fabricate to comply with NAAMM MBG 531, "Metal Bar Grating Manual." 1.9 STAIR RAILINGS A. Steel Tube Railings:  Fabricate railings to comply with requirements indicated for design, dimensions, details, finish, and member sizes, including wall thickness of tube, post spacings, and anchorage, but not less than that needed to withstand indicated loads. 1. Rails and Posts:  1-1/2-inch- (38-mm-) square top and bottom rails and 1-1/2-inch- (38-mm-) square posts. B. Welded Connections:  Fabricate railings with welded connections.  Cope components at connections to provide close fit, or use fittings designed for this purpose.  Weld all around at connections, including at fittings. END OF SECTION 05 5100 

055100 - Metal Stairs

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055100 - Metal Stairs

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