Modeling of a shake‐table tested retrofitted wood‐frame building subjected to subduction ground motions: Fid-Bau Portal

Modeling of a shake‐table tested retrofitted wood‐frame building subjected to subduction ground motions

Pan, Yuxin / Ventura, Carlos E. / Bebamzadeh, Armin / Motamedi, Mehrtash

In 2004 , the provincial government of British Columbia in Canada initiated a seismic retrofit program to quantify the seismic risk and to implement a seismic mitigation plan over 750 school buildings located in high seismic hazard regions of the province. The current phase of the program focuses on conducting a series of full‐scale shake‐table tests of a retrofitted two‐story wood‐frame school building prototype as part of the performance‐based Seismic Retrofit Guidelines (SRG). This paper presents the numerical modeling and seismic assessment of the tested building. A detailed two‐dimensional model and a computationally efficient three‐dimensional model were developed. By performing nonlinear dynamic analyses, both models predicted the building responses accurately when compared with the experimental tests in terms of roof drift, energy dissipation, and global hysteresis behavior. The retrofitted school building showed a large overstrength that mainly came from the unblocked walls. Empirical equations based on the FEMA P‐807 guidelines and a simplified method developed in the SRG, called Toolbox Approach were investigated for estimating its overstrength and ultimate capacity. Finally, following a performance‐based tri‐hazard probabilistic methodology proposed in the SRG, the seismic risk of the building was assessed by performing incremental dynamic analysis using 30 ground motion records that were selected based on a multiple event‐based conditional mean spectrum (CMS) approach. The results indicated that the subduction motions posed higher probability of drift exceedance and collapse risk of the retrofitted school building than crustal and subcrustal motions.