These structural details illustrate various steel connections for stair landings and stringers utilizing channels and hollow structural sections. Detail A connects a C4 channel stair stringer with stiffeners to an MC12 or C12 stringer using a quarter-inch thick plate with three-quarter-inch machine bolts and a three-sixteenths-inch fillet weld. Detail B connects an MC12 or C12 stringer with a quarter-inch plate and three three-quarter-inch machine bolts welded with three-sixteenths-inch fillet welds. Detail C ties a four-by-four structural steel tube to a twelve-by-four structural steel stringer with a three-sixteenths-inch fillet weld. Detail D shows a twelve-by-four structural steel stringer with full penetration welds. Detail E displays a bolted connection using a quarter-inch plate with three three-quarter-inch machine bolts joining stair stringers at an angle. Detail F connects a C4 channel stringer with stiffeners to a C8 channel using a quarter-inch thick plate with three-quarter-inch machine bolts.
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