Hysteresis behavior of bracket connection in cross-laminated-timber shear walls

Cross Laminated Timber (CLT), a new generation of engineered wood-based products, provides promising solutions to the mid- and high-rise wood building. A series of connection tests and CLT shear walls tests subjected to general quasi-static monotonic and cyclic loading protocols have been undertaken at FPInnovations of Canada to gain comprehensive understanding of its structural properties. Using these testing results, two hysteretic models (Saws model and Pinching4 model) in OpenSees are calibrated in this paper. For both models, pinching behavior, strength and stiffness degradation have been taken into consideration. Both models are compared with three kinds of connection load-slip tests for CLT shear wall under monotonic and cyclic loading protocols. From the results, Pinching4 model showed better performance than Saws model in accounting for rapid degradation of reloading stiffness and unloading stiffness of the bracket connection. Finally, the wall modeling results, based on three types of connections, are compared with the corresponding full scale CLT wall tests results. Utility of Pinching4 model is illustrated to predict the wall response under general monotonic and cyclic loading protocols.