A standard wide-flange steel section identified by its depth and weight, such as W12×50.
The designation for wide-flange structural steel sections as defined by the American Institute of Steel Construction (AISC). W-shapes are identified by their nominal depth and weight per linear foot, such as W18×35 (18-inch nominal depth, 35 lb/ft). Their wide flanges provide greater bending capacity and connection area than older S-shape (American Standard) sections.
The structural drawings specify W21×68 sections for the main floor beams, providing adequate capacity for the 75 psf design live load.
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