Compressive Behavior of Concrete Confined by Mechanism-Based Fiber Composite Bistable Structure
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 12
Abstract
The application of fiber-reinforced polymer (FRP) composites in civil engineering has advanced drastically in recent years, especially in the retrofit of concrete bridge columns. However, composite’s typical nonductile behavior and low-energy absorption are some of the concerns that have yet to be fully addressed. The objective of this research is to investigate a new mechanism-based bistable composite structure as the wrapping system for concrete columns to improve the energy absorption and damage tolerance. The bistable structure consists of energy-absorbing main links (primary load carrier) and waiting links (secondary load carrier to be activated after main link fails). A series of uniaxial compression tests on cylindrical concrete members wrapped with hybrid carbon-glass FRP bistable structure were conducted to demonstrate the concept and study the effect caused by link geometry. The results showed that a controlled failure with signs of failure (warning) was achieved in the system and both the ductility and energy absorption were enhanced. The effectiveness of the confinement depended on the number of links and the energy absorption relied on the size of the links.
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Acknowledgments
This research is partially funded by the Hellman Foundation Board (2008-2009 UC Davis Hellman Fellows). Their financial support is gratefully acknowledged.
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© 2011 American Society of Civil Engineers.
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Received: Mar 9, 2010
Accepted: May 4, 2011
Published online: May 6, 2011
Published in print: Dec 1, 2011
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