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Experimental testing of high capacity screwed and nailed connections in Douglas-fir CLT

By Minghao Li, Justin Brown and Wenchen Dong, April 2020.

Download SWP-T098- (pdf)

Executive summary

This report presents experimental results of two project tasks. The first task is to study withdrawal behaviour of self-tapping screws (STS) in Douglas-fir CLT by conducting 167 withdrawal tests. It is very common to install STS with inclined angles to transfer shear loads between CLT panels in CLT buildings. Thus the screw withdrawal behavior needs to be well understood as it may govern the connection strength and stiffness. The second task is to study the ductility and overstrength properties of nailed hold-down connections in Douglas-fir CLT by conducting 40 hold-down connection tests. Nailed CLT hold-downs are commonly used in CLT shear wall structures to resist seismic loads. Ductility and overstrength properties of the hold-down connections are critical to achieve robust seismic design of CLT shear walls.

The experimental results demonstrated generally excellent connection behaviour in Douglas-fir CLT and the research outcome will provide valuable technical information for engineers to specific Douglas-fir CLT in building design.

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