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Teweldebrhan, Biniam Tekle

University of British Columbia

This thesis aims to advance the seismic design of mass timber buildings by developing a resilience-based design framework based on a multi-objective optimization approach. The utility of the framework is applied to design a 20-storey resilient timber-based structural system. Initially, this thesis studied the mechanics of a cross-laminated timber coupled walls (CLTCWs) system and a dual system made up of CLT balloon shear-wall and a glulam moment-resisting frame (CLTW-GMRF) system. The study established their seismic design procedure and conducted parametric studies on various design parameters. As the proposed design methods are based on continuum medium method and equivalent static force procedure, rigorous non-linear static and dynamic analyses were performed, using numerical models developed in OpenSees, to examine the performance of the proposed systems. Based on the findings of the two structural systems, this thesis introduces a resilient coupled CLTCWs-GMRF system that integrates the unique features of CLTCWs and GMRF systems. A 20-storey baseline system was designed using the proposed seismic design procedures for CLTCWs and CLTW-GMRF systems. The numerical model of the system was developed in OpenSees and its structural performance was examined using non-linear analyses. Based on the results of the analyses, key design variables were identified, multiple objective functions were defined, and a deep learning-based surrogate model was trained to optimize the seismic design of the system. Next, the thesis focuses on evaluating the seismic resilience of the proposed CLTCWs-GMRF system. Accordingly, the fragility and consequence functions of key structural components of the building were defined, allowing a probabilistic assessment of seismic loss and resilience based on the FEMA P-58 methodology and a state-of-the-art repair time model. The results, from quantifying the damage states of individual structural and non-structural components to post-earthquake recovery trajectories of the entire system, were obtained and discussed. Insights from the resilience assessment were then used to develop a resilience-based design framework, leveraging multi-objective optimization to balance the trade-off between shorter post-earthquake recovery and efficient structural design. Overall, the framework underscores the potential of timber-based structural systems, particularly CLTCWs integrated with GMRF, to deliver sustainable and resilient solutions for modern high-rise timber construction.

Text

2025-04-25

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/90780

Civil Engineering

University of British Columbia

UBCO

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