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Ferdosi, Ehsan

University of British Columbia

This research provides a damage assessment for balloon-type CLT shear wall systems in two different seismic hazard levels. Engineered Wood Products are growing heavily in large and tall structural applications due to their high strength-to-weight ratio, versatility for prefabrication, and carbon and energy efficiency. However, for more widespread adoption, more comprehensive assessments are required to address all sensitive aspects of using this material. For instance, the performance of the structures that utilize heavy or mass timber products in their Seismic Force Resistant Systems (SFRS) in seismic-prone areas is still widely unknown. In addition, with the new seismic performance measures, like seismic resilience, more effort is needed to assess the seismic performance of engineered timber structures. This study focuses on damage assessment for engineered timber structures after a seismic event as a significant contributor to seismic resilience. In this regard, the performance of a conventional timber-based structural system and a more resilient hybrid option are compared in terms of the damage state in the structural elements. A cantilevered balloon-type CLT shear wall system with dowel-type hold-downs represents the conventional construction practice. In contrast, a coupled CLT shear wall system with link beams and the same hold-downs represents the hybrid option. For comparison, 10-story archetypes are designed and modelled for each structural system. Afterward, probabilistic seismic performance evaluation for each structural system is performed at two hazard levels, one representing a Magnitude 9.0 shaking in the Cascadia Subduction Zone and the other representing the design earthquake in the Canadian Building Code. The analysis considered uncertainty in the hazard source, structural performance, and occurrence of the damage. The results showed that the elements of the coupled system sustained far less damage than the cantilevered system, demonstrating the effectiveness of the resilient solutions. Additionally, the study confirms that reducing damage in connections leads to achieving more resilience in timber-based structures. Overall, this study provides important insights into the seismic performance of timber-based structures in seismic-prone areas and highlights the need for further research.

Text

2024-03-15

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/87577

Forestry

University of British Columbia

UBCV

http://creativecommons.org/licenses/by-nc-nd/4.0/