UBC Theses and Dissertations
Seismic performance evaluation of steel building systems in Canada Bagatini Cachuço, Fabrício
Steel building systems (SBS) are vastly used in North America for low-rise non-residential construction. SBS have many advantages, such as low cost, fast construction, and customizability. The structural components are optimized with usage of tapered steel plates. Despite its popularity, only a few studies have focused on SBS seismic response. In Canada, the seismic design of SBS often adopts equivalent static force procedure with force reduction factors (FRF) which are not developed for SBS. This practice may lead to unexpected seismic performance. In this research, the seismic performance of typical Canadian SBS is investigated through a series of numerical analyses. The complex cyclic behavior of SBS elements is evaluated with a detailed micro model developed in Abaqus and verified with available experimental results. Macro models are then developed with OpenSees to efficiently perform extensive system-level nonlinear time history analyses. A comprehensive seismic performance assessment procedure specially developed for Canadian SBS is proposed. The method accounts for SBS failure mechanisms and for exposure to multiple sources of seismic hazard in Canada. A set of 176 SBS designed with different geometries, types of cladding, force reduction factors (FRF), and locations are assessed with eigen, pushover, and incremental dynamic analyses (IDA). A 𝛾 factor is proposed to evaluate the seismic response, where 𝛾 is used to estimate the median collapse intensity of a SBS with a given base shear capacity. The variations in 𝛾 factor are presented for different geometric configurations. Furthermore, the adjusted collapse margin ratio (ACMR) is compared with acceptance thresholds presented in FEMA P695 document. The present study suggests that FRF = 1.3 can be adopted for designing typical SBS in Canada. The findings herein reduce the gap of knowledge on the seismic performance of SBS while providing crucial data for the development of seismic design guidelines in Canada.
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