Parametric Collapse Performance of Low-Ductility Concentrically Braced Frames with Reserve Capacity
Publication: Journal of Structural Engineering
Volume 147, Issue 8
Abstract
In moderate-seismic regions, cost-effective steel building design solutions such as the and ordinary concentrically braced frame (OCBF) systems do not consistently provide reliable life-safety protection. The collapse performance behaviors of these systems are not thoroughly substantiated by experimental or historical evidence. Thus, a numerical study consisting of 2 conventional and 216 parameterized variations of a prototype seismic force–resisting system (SFRS) was developed to (1) investigate low-ductility braced frame failure mechanisms and collapse performance capabilities; (2) quantify the influences of key design parameters on probabilistic collapse capacity; and (3) provide the basis for development of a robust and socioeconomically viable design alternative for low-ductility concentrically braced frame (CBF) systems. Collapse probabilities were assessed through numerical simulations of ground motion excitations using incremental dynamic analysis (IDA), and variations in collapse probabilities were quantified with respect to five design parameters using an ANOVA model. The results indicate that the collapse probabilities of low-ductility CBF systems can be substantially reduced through design parameters that promote favorable failure hierarchies and provide deliberately engineered reserve capacity.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. In particular, this includes source code and analysis results for the angle, connection, and building models and their corresponding analyses.
Acknowledgments
This study was supported by the National Science Foundation (Grant No. CMMI-1207976) and the American Institute of Steel Construction.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 8 • August 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Nov 15, 2019
Accepted: Feb 12, 2021
Published online: Jun 10, 2021
Published in print: Aug 1, 2021
Discussion open until: Nov 10, 2021
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