Laserfiche WebLink
<br />Copyright 2002 AlA <br /> <br />MASTERSPEC Short Form <br /> <br />02/02 (R 05/06) <br /> <br />SECTION 055ll - METAL STAIRS <br /> <br />PART 1 - GENERAL <br /> <br />1.1 SUMMARY <br /> <br />A. This Section includes the following: <br /> <br />1. Preassembled steel stairs with [concrete-filled] [precast concrete] [epoxy-resin-fIlled] <br />[and] [abrasive-coating-fmished formed-metal] treads. <br />2. Industrial-type stairs with steel [floor plate] [grating] treads. <br />3. Steel tube railings attached to metal stairs[ and to walls adjacent to metal stairs]. <br /> <br />B. See Division 5 Section "Pipe and Tube Railings" for pipe and tube railings. <br /> <br />1.2 PERFORMANCE REQUIREMENTS <br /> <br />A. Structural Performance of Stairs: Provide metal stairs capable of withstanding the effects of <br />gravity loads and the following loads and stresses within limits and under conditions indicated: <br /> <br />1. Uniform Load: 100 lbf/sq. ft. (4.79 kN/sq. m). <br />2. Concentrated Load: 300 Ibf (1.33 kN) applied on an area of 4 sq. in. (2580 sq. mm). <br />3. Uniform and concentrated loads need not be assumed to act concurrently. <br />4. Stair Framing: Capable of withstanding stresses resulting from railing loads in addition <br />to loads specified above. <br />5. Limit deflection of treads, platforms, and framing members to [L/240] [L/360] <Insert <br />deflection ratio> or 1/4 inch (6.4 mm), whichever is less. <br /> <br />B. Structural Performance of Railings: Provide railings capable of withstanding the effects of <br />gravity loads and the following loads and stresses within limits and under conditions indicated: <br /> <br />1. Handrails: <br /> <br />a. Uniform load of 50 IbfY ft. (0.73 kN/m) applied in any direction. <br />b. Concentrated load of 200 Ibf (0.89 ktl\J) applied in any direction. <br />c. Uniform and concentrated loads need not be assumed to act concurrently. <br /> <br />2. Top Rails of Guards: <br /> <br />a. Uniform load of 50 Ibfl ft. (0.73 kN/m) applied in any direction. <br />b. Concentrated load of200 Ibf (0.89 kN) applied in any direction. <br />c. Uniform and concentrated loads need not be assumed to act concurrently. <br /> <br />3. Infill of Guards: <br /> <br />a. <br /> <br />Concentrated load of 50 Ibf (0.22 kN) applied horizontally on an area of] sq. ft. <br />(0.093 sq. m). <br />Uniform load of251bf/sq. ft. (1.2 kN!sq. m) applied horizontally. <br /> <br />b. <br /> <br />METAL STAIRS <br /> <br />05511 - 1 <br />