Seismic loss and resilience assessment of tall-coupled cross-laminated timber wall building

Abstract

Balloon-type cross-laminated timber coupled-wall (CLT-CW) structure is an emerging and sustainable option for constructing tall timber buildings. The structure features buckling restrained brace (BRB) hold-downs, balloon-type CLT walls, and coupling beams with replaceable shear links. This study investigates the probabilistic seismic performance (including economic loss, downtime, and resilience index) of a 20-story CLT-CW building. A three-dimensional (3D) structural model is developed to perform incremental dynamic analysis using 30 pairs of ground motion records that represent the seismicity of Vancouver, Canada. Intensity- and time-based loss assessments are conducted to estimate probability distributions of seismic losses according to the FEMA P-58 methodology. Post-earthquake recovery trajectories of the housing function are also presented to calculate the seismic resilience indices under different intensities. The results reveal that the coupling beams contribute the most to repair cost among all structural components. In light of the replaceability and energy dissipating role of coupling beams, the efficiency and resiliency of the CLT-CW building are validated.

Multi-variate seismic fragility assessment of CLT coupled wall systems

“…The seismic performance of individual CLT panels and platform-framed CLT shear walls has been widely explored in literature (e.g. Shahnewaz et al, 2020;van de Lindt et al, 2019); however, the seismic research on balloon-framed CLT systems remains incomplete and there remain research topics worthy of investigation (Shahnewaz et al, 2021;Tesfamariam and Teweldebrhan, 2023). Given CLT-CW systems are a relatively new structural solution, with unique structural characteristics and energy dissipation mechanism , their performance under seismic loading, including responses to varying seismic hazard levels and the impact of different design parameters, has not yet been thoroughly investigated.…”

“…In the PSFA of CLT- CW system, both MaxISDR and ResISDR hold importance. A recent study by You et al (2023) indicates that although MaxISDR is the primary damage indicator for CLT-CW system, ResISDR also plays a significant role from a resilience-focused perspective. Remarkably, nearly 80% of total repair costs of damaged structural components are attributed to the damage of coupling beams due to residual deformation.…”

Functional recovery evaluation of hybrid self‐centering piston‐based braced frames

“…Furthermore, the F-Rec framework, designed to calculate performance metrics, including post-earthquake functionality, recovery time, and trajectory, as established by Cimellaro et al, 2 addresses assumptions in the REDi model. Within these frameworks, studies have explored the functional recovery of various structural archetypes, including concrete shear walls, [14][15][16][17] moment frames, 18 cross-laminated timber walls, 19,20 seismically isolated buildings, 21,22 retrofitted systems, 23 and viscously damped steel frames. 24,25 The research findings underscore the need to refine current design codes to enhance post-earthquake functionality, as the conventional buildings designed to meet life-safety criteria may still experience substantial recovery time after a severe earthquake.…”