A steel stair stringer formed from an L3x3x1/4 angle connects to a thickened slab on grade over a mat foundation. The angle is secured to the concrete using three-quarter-inch diameter by eight-inch expansion anchor bolts at each stringer. A three-sixteenths-inch fillet weld is applied on three sides of the stringer connection as shown. The slab features a two-foot typical thickened section, with mat thickness sized per plan and reinforced with number four bars at eighteen inches on center typical.
OR SLAB FIN GRADE THICKENED 2'-0" TYP 12" TYP 1 1 STEEL STRINGER L3x3x1/4 W/ 3/4"Ø x8" EXPANSION AB @ EA STRINGER TYP 3/16 3 SIDES STRINGER AS SHOWN SOG - SEE PLAN THICKEN AT SEE PLAN MAT THICKNESS TOP OF MAT FDN NOTE: FOR DETAILS NOT SHOWN, SEE / 11 S4-121 #4 @18"O.C. TYP
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