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Skandalos, Konstantinos

University of British Columbia

This dissertation examines the seismic design and demand assessment of isolated and innovative timber lateral load resisting systems for buildings. The dissertation begins by examining the optimal stories of installation and the effective stiffness and damping properties of a single and multiple isolation layers installed at a case study building, using an Inter-Story Isolation (ISI) configuration. As result of this study, the optimal stories of installation of the isolation layers are identified and the decrease in response with increasing the number of isolation layers is quantitatively assessed. Then, a framework is presented for conducting seismic reliability analysis using a multi-fidelity surrogate model. The presented approach features an expensive high-fidelity model and a cheap low-fidelity model and it is illustrated for an example base-isolated building. The multi-fidelity approach provides good accuracy in assessing the probability of failure of the system by utilizing only minimal high-fidelity model evaluations. Next, the dissertation investigates the design and seismic demand assessment of innovative timber lateral-load resisting systems. First, a novel dual system is examined, comprising a Light Timber Frame (LTF) which is equipped with friction connections and coupled to a rocking Cross-Laminated Timber (CLT) wall equipped with self-centering hold-downs. LTF works as the energy-dissipating sub-system or fuse, while CLT helps in imposing a uniform drift distribution throughout building elevation and in self-centering the system at the end of the seismic event. The dissertation closes by examining the effect of Soil-Structure Interaction (SSI) and frequency dependence of soil-foundation dynamic behavior on the seismic demand of CLT walls coupled with dissipating connectors. The effect of SSI is shown to be significant for a five-story coupled CLT wall frame founded on heterogeneous soil with a soft upper layer.

Text

2021-12-20

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/80470

Civil Engineering

University of British Columbia

UBCO

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