Steel tube stair stringers frame into a steel tube beam beneath a concrete over steel deck floor. A 3x3x5/16 angle spans between stringers with a 1/4 inch thick stiffener plate centered at stringer locations. A 1/4 inch thick steel closure plate caps the end of the stringer. Five-sixteenths inch fillet welds connect the structural components typical.
STEEL TUBE BEAM L3x3x5/16 x LENGTH BTWEEN STRINGERS W/1/4" THICK STIFF PL CENTERED AT STRINGER LOCATIONS 1/4" THICK STEEL CLOSURE PLATE AT END OF STRINGER CONC OVER STEEL DECK STEEL TUBE STAIR STRINGER STEEL TUBE STAIR STRINGER 5/16 5/16 TYP 5/16 TYP
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