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- 저자 : Fabrício Bagatini-Cachuço (검색결과 1 건)
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Seismic performance assessment of pre-engineered steel buildings on the west coast of Canada
Fabrício Bagatini-Cachuço,T.Y. Yang 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.3
This paper focuses on the seismic performance of typical pre-engineered steel buildings (PSB) on the west coast of Canada. PSB are widely adopted for commercial and industrial long span low-rise constructions. Their structural system consists of a moment resisting frame made of built-up tapered I-beam elements, which often have slender and/or non-compact sections to minimize steel consumption. Typical seismic design of PSB consists of elastic analysis with force reduction factors (FRF) that assume some ductility. However, failure mechanisms in PSB are usually governed by flange local buckling and lateral torsional buckling, which might not provide the expected ductility. This paper presents an extensive series of numerical analyses to evaluate the seismic performance of four PSB prototypes designed for the city of Victoria on the west coast of Canada. Prototypes have similar general dimensions, while members’ sizes vary due to usage of different FRF. A finite element model (FEM) has been calibrated based on experiments to capture the post-buckling response of tapered built-up steel elements under cyclic load. Furthermore, seismic performance of each PSB prototype has been assessed with incremental dynamic analysis procedure. Structural characteristics, such as ductility and overstrength, are identified. In addition, the prototypes’ probability of collapse is assessed under a set of 33 ground motions from multiple sources of hazard. The resultant collapse margin ratio is compared with the acceptance criterion per FEMA P695 recommendation. The study concludes proposing FRF=1.3 for the efficient design PSB on the west coast of Canada.
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