Official website of the New Zealand Farm Forestry Association

Experimental studies on Douglas-fir CLT connections and core-walls

By Minghao Li & Justin Brown, June 2019.

Download SWP-T082 (pdf)

Executive summary

This project report summarizes the experimental testing results of Douglas-fir Cross-laminated Timber (CLT) connections and core-walls. 54 screwed connection tests were performed under both monotonic and cyclic loading, and 31 castellated connection tests were performed under monotonic loading. A total of 18 tests were performed in the core-wall system testing phase. It was found that mixed angle screwed connections showed significant displacement capacity, high strength and stiffness and are suitable for seismic design of CLT buildings with moderate or high ductility in New Zealand. Castellated connections showed high strength capacity and are an efficient connection type for transferring shear loads between CLT panels. The core-wall testing results showed that significant increases in strength and stiffness are achievable when considering the contribution from orthogonal walls. Meanwhile, it was found that mixed angle screwed connections were able to increase the robustness of the connections between CLT wall panels, thus increasing the coupling effect or composition action in the core-walls as well as energy dissipation of the core-wall system. The experimental testing results provided strong technical evidence that the CLT core-walls can provide more efficient lateral load resisting systems for mid-rise and high-rise timber buildings.


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