Stair stringers frame into an HSS8x4x3/8 support tube. The assembly utilizes an L6x4x3/8 angle member welded to the support with a quarter-inch fillet weld, paired with 10-gauge bent plates and small L1-1/2x1-1/2x3/16 by zero-foot-eight-inch angle segments typically spaced throughout. A quarter-inch by five-inch by zero-foot-five-inch plate sits atop the landing with specific dimensions detailed across the ten-inch width. Fillet welds of quarter-inch and three-sixteenth-inch sizes secure the steel plates and angles together at the landing and stringer junctions.
2" L1-1/2x1-1/2x3/16 x 0'-8" TYP 10GA BENT PLATE 1'-8" 1'-6" 2" 1/4" PLATE 2" 3" 6" L6x4x3/8 HSS8x4x3/8 CLR 1/4" 1/4 1/4 1/4" PLATE 2" 3" 6" L6x4x3/8 HSS8x4x3/8 1/4 TYP CLR 1/4" 1'-4 1/2" 2" 1'-2 1/2" 10GA BENT PLATE 1/8 1-1/2 TYP 1/8 1-1/2 TYP L1-1/2x1-1/2x3/16 x 0'-8" TYP 1/8 1-1/2 -12 TYP HSS8x4x3/8 3/16 TYP 10" 3 1/8" 3 3/4" 3 1/8" 1 7/8" 1 7/8" 1/4x5x0'-5" PLATE LANDING EL SEE PLAN 1/4 TYP 1/4 1/4 3/16 TYP PP
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