Experimental and Analytical Responses of Hollow and Concrete-Filled GFRP Tube Columns under Impact
Publication: Journal of Composites for Construction
Volume 21, Issue 4
Abstract
Glass fiber-reinforced polymer (GFRP) composite fender systems, including FRP columns, protect vehicles from colliding with bridge piers. The FRP columns are either hollow (flexible) or filled with concrete (rigid). This paper presents the experimental and analytical results of tests with hollow and concrete-filled GFRP tubes under impact loads. The impact responses are evaluated as a function of fiber volume fraction and energy absorption, in addition to other common structural parameters. The test results reveal that increasing the longitudinal fiber volume fraction up to approximately 60% decreases deformation or failure of both the hollow and concrete-filled GFRP tubes and has an insignificant effect on the response of peak impact and energy absorption. This may be attributed to an inadequate bond strength between concrete and FRP at failure, or failure may be driven by local effects. Hollow GFRP tubes were damaged more seriously than concrete-filled GFRP tubes, and the peak impact loads of hollow tubes were lower by approximately 80% than those of concrete-filled GFRP tubes. However, the energy absorption capacities of hollow GFRP tubes were nearly identical to those of concrete-filled GFRP tubes under the same magnitude of impact energy. A three-dimensional finite-element model was developed to simulate the impact behavior of two types of GFRP tubes, and the numerical results agreed well with the test data. Analytical solutions from the Euler–Bernoulli beam equation for the lateral displacement of beams under sinusoidal impact loads were obtained for comparison with experimental results. These results showed that the maximum displacement could be accurately predicted by the proposed theoretical model.
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Acknowledgments
The financial support from the National Natural Science Foundation of China (Grant 51578283) and Key Program of the National Natural Science Foundation of China (Grant 51238003) is greatly appreciated. Partial funding of this research was provided by the U.S. National Science Foundation Grant IIP 1230351.
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Published In
Journal of Composites for Construction
Volume 21 • Issue 4 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 9, 2016
Accepted: Oct 31, 2016
Published online: Feb 15, 2017
Discussion open until: Jul 15, 2017
Published in print: Aug 1, 2017
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