Seismic Design and Performance of Steel Moment-Resisting Frames with Nonlinear Replaceable Links
Publication: Journal of Structural Engineering
Volume 137, Issue 10
Abstract
Although moment resisting frames (MRFs) designed according to the latest seismic codes can provide life safety during a design level earthquake, they are expected to sustain significant damage at flexural yielding locations in the beams. The design of the beams for strength and drift control considerations are also interlinked, often resulting in overdesign of other elements, such as diaphragms and foundations. These drawbacks can be mitigated by introducing replaceable links at the locations of expected inelastic action. A five-story prototype MRF building with replaceable links in a high-seismic zone was designed. Four full-scale beam-to-column subassemblages representing the first floor exterior connections in the prototype building were experimentally evaluated. The results demonstrated that MRFs with replaceable flexural links can provide strength and ductility equivalent to existing MRFs while minimizing the effect of the added links on the elastic stiffness of the system. Finite-element models were then developed to capture the observed experimental responses, including local buckling, bolt slipping, and bolt bearing.
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Acknowledgments
Financial support for this study was provided by the National Science and Research Council of Canada (NSERC) under the Collaborative Research and Development Grant Program, the Steel Structures Education Foundation (SSEF), and the Canadian Institute of Steel Construction (CISC). Test specimens were donated by Walters Inc., Hamilton, Canada. This in-kind support is kindly appreciated and gratefully acknowledged. The authors also express their appreciation to the technical staff of the Structural Engineering Laboratory at the University of Toronto for their invaluable assistance in the test program.
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Published In
Journal of Structural Engineering
Volume 137 • Issue 10 • October 2011
Pages: 1107 - 1117
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Oct 4, 2009
Accepted: Dec 15, 2010
Published online: Dec 17, 2010
Published in print: Oct 1, 2011
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