Strengthening of Laterally Restrained Steel Beams Subjected to Flexural Loading Using Low-Modulus CFRP
Publication: Journal of Performance of Constructed Facilities
Volume 33, Issue 3
Abstract
Upgrading the flexural design strength of the structural member for increased live load without disrupting the functionality of the structure is an arduous task. One such problem was investigated in this study by using low-modulus () carbon fiber–reinforced polymer (CFRP) for retrofitting of structural steel members. Although most researchers use normal (up to 250 GPa) or high-modulus (above 250–640 GPa) CFRP for flexural strengthening of steel structures, the use of low-modulus CFRP for such applications has been largely unexplored. The present study demonstrated the feasibility of low-modulus CFRP by experimental testing using different retrofitting techniques such as flange wrap, flange-web wrap, and closed wrap. A total of 18 steel beams were tested under four-point bending that includes two control specimens and 16 CFRP-strengthened specimens. In each strengthening scheme, enhanced CFRP wrapping configurations were introduced based on the failure modes observed from the previous wrapping configurations, thereby the strength, as well as the failure mode, improved. In general, the experimental results indicate that the design strength of the structural steel member subjected to flexural loading can be increased up to by using the low-modulus CFRP strengthening schemes.
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Acknowledgments
The investigation reported in this paper was funded by a research grant (SB/FTP/ETA-93/2013) from the Department of Science and Technology (DST), Government of India. The authors would like to gratefully acknowledge Pennar Engineered Building Systems Ltd., Hyderabad, India, for their help in fabricating the test specimens required for experimental investigation.
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Published In
Journal of Performance of Constructed Facilities
Volume 33 • Issue 3 • June 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Apr 24, 2018
Accepted: Oct 22, 2018
Published online: Mar 19, 2019
Published in print: Jun 1, 2019
Discussion open until: Aug 19, 2019
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