Structural · S-DKKJP

Typical Steel Column to CLT Slab Connection

Materials

Concrete Steel Timber / Wood Gypsum / Drywall

Elements

Columns Walls Stairs Roofs Floors / Slabs Arches Connections / Plates

Connections

HSS Connection Welded Connection Timber / Mass-Timber Connection

About this detail

A hollow structural section steel column passes through a cross-laminated timber slab, featuring an HSS 3 1/2 inches by 3 1/2 inches by 1/4 inch locator spigot complete with four 5/8-inch diameter threaded rods in 1-inch diameter holes within the cross-laminated timber panel above, secured with nuts and washers. A 1/16-inch thick by full column size washer plate is installed on the top side of the cross-laminated timber, featuring an oversized cutout in the middle to slip over the hollow structural section and 1/16-inch oversized holes for threaded rods, placed prior to landing the upper column. At the underside of the cross-laminated timber panel, a plate is locally dapped to maintain the gypsum encapsulation strategy. A 1/16-inch deep locating recess is machined into the top of the steel plate to ensure precise center location of the hollow structural section stub prior to welding. Fillet welds of 1/4-inch connect the inside wall of the spigot to the plate on two sides of the hollow structural section only, ground smooth with weld spray removed. Optional shop-installed structural screws at forty-five degrees are provided off each column face as detailed per plan. Concrete topping over an acoustic mat and typical architectural finishes complete the floor assembly above the cross-laminated timber panel.

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