Restraining Steel Brace Buckling Using a Carbon Fiber-Reinforced Polymer Composite System: Experiments and Computational Simulation
Publication: Journal of Composites for Construction
Volume 12, Issue 5
Abstract
This paper presents an experimental and computational study of the buckling behavior of steel members strengthened with carbon fiber-reinforced polymer (CFRP) wraps. In the proposed strengthening system, steel members are first sandwiched within a core comprised of mortar or PVC blocks and then the entire system is wrapped with CFRP sheets. A matrix of specimens is tested under monotonic compression to investigate the parameters that influence system response. Test results show that the proposed strengthening method can provide enough lateral support to a steel bar member to allow it to reach yield in compression and to continue deforming inelastically beyond. Key failure modes are identified in the test program. Important parameters that influence behavior are also pinpointed and studied in more detail through a computational simulation model that is validated using the test data. Parameters identified as influential in the experimental and computational studies include: number of CFRP layers, core thickness, bond between CFRP layers and the core, bond between the core and the inner steel member, and strength of transverse sheets at the member ends.
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Acknowledgments
The research presented in this paper was supported in part by the Department of Civil and Environmental Engineering at the University of Michigan and the Michigan Department of Transportation. Carbon fiber polymer sheets and epoxy were provided by Degussa, Inc. Any opinions, findings, conclusions, and recommendations expressed in this paper are those of the writers alone and do not necessarily reflect the views of the sponsoring agencies.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 12 • Issue 5 • October 2008
Pages: 562 - 569
Copyright
© 2008 ASCE.
History
Received: Feb 15, 2007
Accepted: Nov 20, 2007
Published online: Oct 1, 2008
Published in print: Oct 2008
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