The stair stringer connects to a wide flange beam via a three-eighths-inch stringer end plate and an L6x4x3/8 angle welded with three-sixteenths-inch fillet welds. An L6x4x3/8 continuous angle spans between stringers, secured with two seven-eighths-inch diameter by one-and-a-half-inch A325 twist-control bolts with one bolt within four inches of each stringer. A three-eighths-inch stiffener plate is welded to the wide flange beam web using quarter-inch fillet welds. Concrete fill is placed after the stair installation.
STRINGER SEE PLANS 3/8" STRINGER END PLATE TYP CONC FILL AFTER STAIR INSTALLATION WF BM SEE PLAN STRINGER UP CONNECTION L6x4x3/8 (LLV) CONT BETWEEN STRINGERS W/ (2) 7/8" Ø x 1 1/2" A325 T.C. BOLTS (1 BOLT W/IN 4" OF EA STRINGER) 3/8" STIFFENER PL ES 1 1/2" 5 1/2" L6x4x3/8(LLH) 1/4 1/4 TYP EA END 4 3/16 2-12 3/16 TYP AT END PLATE 3/16 ANGLE TO STR 2 1/2 3/16
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