Self-Centering Energy Dissipative Bracing System for the Seismic Resistance of Structures: Development and Validation
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Volume 134, Issue 1
Abstract
Buildings designed according to modern seismic codes are expected to develop a controlled ductile inelastic response during major earthquakes, implying extensive structural damage after a design level earthquake, along with possibly substantial residual deformations. To address this drawback of traditional yielding systems, a new bracing system that can undergo large axial deformations without structural damage while providing stable energy dissipation capacity and a restoring force has recently been developed. The proposed bracing member exhibits a repeatable flag-shaped hysteretic response with full recentering capabilities, therefore eliminating residual deformations. The mechanics of this new system are first explained, the equations governing its design and response are outlined, and one embodiment of the system, which combines a friction dissipative mechanism and Aramid tensioning elements, is further studied. Results from component tests, full-scale (reduced length) quasi-static axial tests, and quasi-static and dynamic seismic tests on a full-scale frame system are presented. Experimental results confirm the expected self-centering behavior of the self-centering energy dissipative (SCED) bracing system within the target design drift. Results also confirm the validity of the design and behavior equations that were developed. It is concluded that the proposed SCED concept can represent a viable alternative to current braced frame systems because of its attractive self-centering property and because the simplicity of the system allows it to be scaled to any desired strength level.
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Acknowledgments
Financial support for this project was provided by the Natural Sciences and Engineering Research Council of CanadaNRC under the Idea to Innovation (I2I) program and the Canada Research Chair Program. In-kind contributions from Carlsile Group Inc. and Linear Composites Ltd. are gratefully acknowledged. The writers wish to acknowledge the most valuable contributions of the technical staff of the Structures Laboratories at the University of Toronto and École Polytechnique of Montreal throughout this project.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 1 • January 2008
Pages: 96 - 107
Copyright
© 2008 ASCE.
History
Received: Oct 26, 2006
Accepted: Mar 27, 2007
Published online: Jan 1, 2008
Published in print: Jan 2008
Notes
Note. Associate Editor: Akshay Gupta
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