Seismic Strengthening of Severely Damaged Beam-Column RC Joints Using CFRP
Publication: Journal of Composites for Construction
Volume 18, Issue 2
Abstract
This article investigates the seismic behavior of three full-scale exterior reinforced concrete (RC) beam-column joints rehabilitated and strengthened with externally bonded carbon fiber–reinforced polymers (CFRP). The specimens had inadequate detailing in the core zone and replicated joints of a real substandard building tested as part of the EU-funded project BANDIT. Seven tests were performed in two successive phases. The bare joints were first subjected to reversed cyclic loading tests to assess their basic seismic performance. As these initial tests produced severe damage in the core, the damaged concrete was replaced with new high-strength concrete. The specimens were subsequently strengthened with CFRP sheets and the cyclic tests were repeated. The results indicate that the core replacement with new concrete enhanced the shear strength of the substandard joints by up to 44% over the bare counterparts. ASCE guidelines predict accurately the shear strength of the bare and rehabilitated joints. The CFRP strengthening enhanced further the joint strength by up to 69%, achieving a shear strength comparable to that of joints designed according to modern seismic provisions. Therefore, the rehabilitation/strengthening method is very effective for postearthquake strengthening of typical substandard structures of developing countries.
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Acknowledgments
R. Garcia thankfully acknowledges the financial support provided by CONACYT and DGRI-SEP (Mexico). Y. Jemaa and Y. Helal thankfully acknowledge the financial support provided by Al-Baath University and Damascus University (Syria), respectively. The CFRP system (Tyfo SCH-41.5X) was kindly provided by Fyfe Europe S.A.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 18 • Issue 2 • April 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 21, 2013
Accepted: Oct 8, 2013
Published online: Nov 26, 2013
Published in print: Apr 1, 2014
Discussion open until: Apr 26, 2014
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