Seismic Performance Assessment of Low-Ductility Concentrically Braced Frames
Publication: Journal of Structural Engineering
Volume 145, Issue 4
Abstract
Current US seismic design provisions allow structures in areas of lower seismicity (e.g., the Midwest and eastern North America) to be designed with modest seismic requirements as compared with the requirements that must be satisfied in areas of higher seismicity (e.g., western North America). Because of the reduced seismic detailing and proportioning requirements in these areas of moderate seismicity, seismic force–resisting systems (SFRSs) within these regions are classified as low-ductility, in contrast to the high-ductility systems common in areas of higher seismicity. Considering the prevalence of low-ductility concentrically braced frames (CBFs) in moderate seismic regions of the US, a thorough performance assessment of these low-ductility CBFs was conducted using detailed OpenSees building models and dynamic numerical simulations. A matrix of 12 buildings was assessed, which varied by number of stories (3, 6, and 9), system configuration (chevron and split-x), and system type [ CBF and ordinary CBF (OCBF)]. An additional set of six buildings was designed, using with modified seismic detailing and proportioning, to investigate an alternate prototype low-ductility SFRS with improved seismic performance. Using the established seismic performance evaluation framework, CBF systems did not pass, whereas all but one of the OCBF systems passed. All but one of the prototype CBF systems passed the seismic performance evaluation, and for the majority of cases, the weight-normalized performance was better than the corresponding OCBF systems.
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Acknowledgments
This study was supported by the National Science Foundation (Grant No. CMMI-1207976) and the American Institute of Steel Construction. The first author was partially supported by a National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144245. This work used the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation Grant No. ACI-1548562. The opinions, findings, and conclusions in this paper are those of the authors and do not necessarily reflect the views of those acknowledged here.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 4 • April 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jan 10, 2018
Accepted: Aug 30, 2018
Published online: Feb 15, 2019
Published in print: Apr 1, 2019
Discussion open until: Jul 15, 2019
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