Seismic design and performance evaluation of novel dual-pinned self-centering coupled CLT shear walls

Abstract

The use of mass timber structures has considerably grown in recent years. This has increased the demand for sustainable, resilient and high-performance mass timber structural systems. In this paper, a novel self-centering balloon-type cross-laminated timber (CLT) shear wall system, called the dual-pinned self-centering coupled CLT shear wall (DSCW), is proposed for tall building applications. The DSCW consists of two sets of CLT panels that are coupled to one another using self-centering friction dampers and are either pinned at their base or sit on V-shaped truss assemblies. This paper also introduces an equivalent energy design procedure (EEDP) that can be used to design the DSCW such that it meets different performance objectives and roof displacement targets at various earthquake intensities. The procedure was used to design the DSCWs of a 12-story prototype building located in Vancouver (Canada). The DSCWs of the prototype building were numerically modeled and subjected to extensive nonlinear time history and incremental dynamic analyses. The results of these analyses show that the proposed EEDP can be efficiently used to design the DSCW such that it achieves the target roof displacements and performance objectives. The results also show that the DSCWs of the prototype building meet the seismic performance requirements of FEMA P695. Overall, the results presented in this paper demonstrate that EEDP-designed DSCWs have excellent seismic performance and can be safely used in tall buildings located in high-seismicity regions.