The stair assembly is framed with hollow structural section members including an HSS 8x8 diagonal beam and HSS 6x6 members between stringers. Tread construction incorporates a 16-gauge pan with a 2-inch concrete filler, supported by typical L 2x2x1/4 angles functioning as ledgers at each tread. The base connections utilize L 4x4x5/16 angles anchored to the concrete slab with two 5/8-inch diameter by 4-inch epoxy bolts. Internal reinforcement includes a 1/2-inch stiffener plate located in the middle of the tube. Welds are specified as 5/16-inch and 1/4-inch typical fillets connecting the structural steel members.
1 1/2 " 2" 4' 6" B B 1/4" TYP. TYP. TYP 5/16 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 B-B HSS6x6x BETWEEN STRINGERS HSS8x8 DIAGONAL BEAM SEE PLAN 1/2" STIFFENER PLATE IN THE MIDDLE OF THE TUBE HSS8x8 SEE PLAN HSS6x6x BETWEEN STRINGERS
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