Residual Performance of FRP-Retrofitted RC Columns after Being Subjected to Cyclic Loading Damage
Publication: Journal of Composites for Construction
Volume 10, Issue 4
Abstract
Numerous recent research findings evidenced the success of retrofitting existing RC columns using fiber-reinforced plastic (FRP) jacketing. However, little is known about the residual performance of FRP-retrofitted RC columns following limited seismic damage. In this paper, the residual performance of FRP-retrofitted columns damaged after simulated seismic loading is studied. Eight model columns with a shear aspect ratio of 5.0 were tested first under cyclic lateral force and a constant axial load equal to 20% of the column gross axial load capacity. The main parameters considered were the type of FRP jacket and peak drift ratio where the lateral loading was interrupted. Glass fiber-reinforced plastic (GFRP) and carbon fiber-reinforced plastic (CFRP) were both used for retrofitting. Five of the model columns were subjected to long-term axial loading after being subjected to limited damage by lateral cyclic loading. From the results of long-term loading test, it was found that FRP-retrofitted columns had much smaller creep deformation than the counterpart as-built model. The deformation of retrofitted columns under long-term axial loading depended on the previous damage intensity and the modulus of elasticity of FRP. The effective creep Poisson’s ratios of the retrofitted columns were much smaller than the as-built column but identical for GFRP and CFRP retrofitted columns. Under the testing conditions of this study, the long-term axial deformation of retrofitted columns tends to be sufficiently stable, despite the simulated earthquake damage.
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Acknowledgments
Main support for this study was provided by the Natural Science Foundation of China (NSFC Grant No. NSFC50278032). Supplemental and travel support for the second writer were provided by the Chong Kong Scholarship and the National Science Foundation US–China Exchange Program managed by MCEER at State University of New York at Buffalo. The writers would like to thank the following gentlemen for their help during the study: Professor Yijiang Liu, Dr. Xiaoyong Mao, Mr. Wenhui He, Mr. Guowei Zhang, Mr. Weifeng Mao, Mr. Xuhua Dong, and Mr. Xian Li of Hunan University. Particular appreciation is extended to Professor Zhenyu Huang and Professor Weijian Yi of the Center for Integrated Protection Research of Engineering Structures (CIPRES), Hunan University for providing the writers with useful input.
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Information
Published In
Journal of Composites for Construction
Volume 10 • Issue 4 • August 2006
Pages: 304 - 312
Copyright
© 2006 ASCE.
History
Received: Jul 18, 2005
Accepted: Dec 14, 2005
Published online: Aug 1, 2006
Published in print: Aug 2006
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