Rate-Dependent Progressive Collapse Resistance of Beam-to-Column Connections with Different Seismic Details
Publication: Journal of Performance of Constructed Facilities
Volume 31, Issue 2
Abstract
The seismic behaviors of different steel beam-to-column moment connections have been fully described by many researchers. Some researchers focus on their progressive collapse resistances by static and rate-independent analyses. However, the influence of strain-rate effect should not be neglected when the main column is removed instantaneously in a progressive collapse analysis. In this paper, the progressive collapse performances of typical steel moment connections with different seismic details, including the welded unreinforced flange-bolted web (WUFB), the welded cover plated flange (WCPF), and the reduced beam section (RBS) connections, are studied by numerical analyses. The rate-dependent stress–strain curves of Q345 steel were obtained from a high-speed tensile machine first. Static push-down analyses were applied to investigate the progressive collapse resistances of beam-to-column connections with different seismic details. The numerical results show that the WCPF connection has the best progressive collapse resistance owing to its strong rotational and bond capacity. For the RBS connection, the reduced beam section contributes to the increased rotational capacity but limits the improvement of its ultimate capacity, especially its dynamic capacity. Strain-rate effects show different influences on the dynamic behaviors of beam-to-column connections. The WUFB and RBS connections are more sensitive to strain-rate effects than the WCPF connection. The bearing and deformation capacities of WUFB and RBS connections increase by more than 40% and 30%, respectively, when the strain-rate effect is considered.
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Acknowledgments
The writers appreciate the support from the Natural Science Foundation of China (NFSC) under Grant 51378381. Any opinions, findings, conclusions, and recommendations expressed in this paper are those of the writers and do not represent the views of the sponsor.
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Published In
Journal of Performance of Constructed Facilities
Volume 31 • Issue 2 • April 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jun 29, 2015
Accepted: Mar 28, 2016
Published online: Jul 21, 2016
Discussion open until: Dec 21, 2016
Published in print: Apr 1, 2017
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