Combination of Bamboo Filling and FRP Wrapping to Strengthen Steel Members in Compression
Publication: Journal of Composites for Construction
Volume 17, Issue 3
Abstract
This paper reports on axial compression experiments on 18 specimens that were strengthened using fiber-reinforced polymer (FRP) fabric and bamboo sticks to improve buckling resistance. The core steel members were first bundled with bamboo sticks longitudinally using steel wire and were then wrapped longitudinally and laterally with FRP fabric. The bending stiffness and load-bearing capacity of the members were increased by the strengthening system, and the bamboo sticks acted as lightweight and free-shaped filling between the steel and FRP. Three major parameters were examined: (1) the cross-sectional shape; (2) the nominal slenderness ratio of the steel members; (3) the number of FRP fabric layers. Although global buckling that is analogous to that in unstrengthened specimens was observed, the strengthened specimens exhibited significant local deformation at the end of the steel member and rupture of the FRP fabric at midheight. The load-displacement results demonstrated an increase of 25–114% for load-bearing capacity and a maximum increase of up to times for ductility. The load-strain developments also evidenced a reduced effective compression stiffness of the strengthened section. Based on the test results, a calculation method for the load-bearing capacity of the strengthened specimens was proposed.
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Acknowledgments
The writers acknowledge funding support from the National Basic Research Program of China (973 Program, No. 2012CB026200) and the National Natural Science Foundation of China (NSFC, No. 50978149). The third writer is a recipient of the Australian Research Council Discovery Early Career Researcher Award. The writers also thank Monash University for supporting this collaboration.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 17 • Issue 3 • June 2013
Pages: 347 - 356
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 8, 2012
Accepted: Dec 14, 2012
Published online: Dec 17, 2012
Published in print: Jun 1, 2013
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