Fatigue Modeling of Concrete-Filled Fiber-Reinforced Polymer Tubes
Publication: Journal of Composites for Construction
Volume 13, Issue 6
Abstract
Field applications and laboratory research have shown the feasibility of concrete-filled fiber-reinforced polymer (FRP) tube (CFFT) in bridges. Yet, their widespread applications require developing appropriate design and analysis tools for different types of loading, particularly fatigue loads. An analytical tool is developed to trace the response of CFFTs under fatigue loading. The FRP material models are calibrated against fatigue and creep coupon tests. Material models are cast into a fiber element analysis, with an algorithm to simulate strain profile, moment-curvature and residual bending strength at any given time or after any number of fatigue cycles in a single or multiple stages of loading. Comparisons with available test data show good agreement with model predictions. A detailed parametric study shows that fatigue response of CFFT beams can improve by either increasing the reinforcement index or the effective modulus of FRP tube in the longitudinal direction. Higher load ranges may drastically reduce fatigue life. Therefore, it is important to limit the load level on CFFTs for a reliable and predictable member performance. The study also recommends reducing fiber orientation in angle plies with respect to the axis of the beam to improve fatigue performance of the CFFT member.
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Acknowledgments
Financial support for this study was provided by the National Science Foundation (Grant No. NSFNSF 0296217) and the Florida Department of Transportation (Grant No. UNSPECIFIEDFDOT 0510700). Findings and opinions expressed here are however those of the authors alone, and not necessarily the views of the sponsoring agencies.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 13 • Issue 6 • December 2009
Pages: 582 - 590
Copyright
© 2009 ASCE.
History
Received: Mar 17, 2008
Accepted: Nov 25, 2008
Published online: Nov 13, 2009
Published in print: Dec 2009
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