Specifications include, but are not limited to: All allowable design stresses shall be in compliance with the SPECIFICATIONS of the design, fabrication, and erection of structural steel for buildings by the American Institute of Steel Construction (AISC) and Uniform Building Code (UBC). Minimum height of fifty-four (54) inches (top of truss top chord) Maximum horizontal opening in railing of four (4) inches Unless otherwise shown on the DRAWINGS, the minimum loading shall be as follows: Uniform live load of sixty (60) pounds per square foot (60 psf). Concentrated live load of one thousand five hundred (1,500) pounds vehicle weight on bridge plus thirty percent (30%) impact. Minimum wind load of twenty-five (25) pounds per square foot (psf). Snow load of seventy (70) pounds per square foot (psf). Railing load of fifty (50) pounds per linear foot (lbs/lf) of horizontal load and two-hundred-pound (200 ) pound point load at any location of rail. Mounting plates shall allow for thermal expansion. Dimensions and Requirements: Span: nominal inside clear distance between inside edges of footers = forty (40) feet and zero (0) Inches. Width: minimum width between railings measured perpendicular to the bridge centerline at any point across the span = four (4) feet and zero (0) inches minimum. Railings: Install for full length of bridge. Decking: Provide a minimum bolt space pattern of twelve (12) inches on centers along the bridge span and twenty-four (24) inches on centers across the width of the bridge. Rub rails: Bridge shall include rub rails of the same materials as the bridge. Nominal two (2) inch by six (6) inch (2" x 6") rub rails on the inside of bridge shall be placed forty-two (42) inches above the top of the bridge deck. Rub rails shall not impede on the minimum width stated above.
