Steel stair assembly utilizing HSS8x8 hollow structural section stringers sized per plan with a one-half-inch stiffener plate centered in the tube. The treads consist of sixteen-gauge metal pans filled with two inches of concrete, supported by L2x2x1/4 angle ledgers at each typical tread. The base connection anchors to the concrete slab using an L4x4x5/16 angle secured with two five-eighths-inch diameter by four-inch epoxy bolts.
11" 2" 7"± 1" 1 1/2 " 1'-4" 2" 4' 6" A A 1/4" TYP. TYP. TYP. TYP TYP 5/16 TYP 5/16 TYP L4x4x5/16" ANGLE W/ 2- 5/8" DIA x4" EPOXY BOLTS TO SLAB , TYP. 16" GA. PEN W/ 2" CONCRETE FILLER TYP. L2x2x1/4 LEDGER AT EACH TREAD TYP. PLAN A-A TYP. TREAD DETAILS 1/2" STIFFENER PLATE IN THE MIDDLE OF THE TUBE HSS8x8 SEE PLAN
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