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Fibers 2017, 5(2), 16; doi:10.3390/fib5020016

Investigation on Strengthening Approaches Adopted for Poorly Detailed RC Corbels

1
Shimizu Corporation, International Division, Singapore 339509, Singapore
2
Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Bencardino
Received: 19 February 2017 / Revised: 10 April 2017 / Accepted: 21 April 2017 / Published: 1 May 2017
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Abstract

Poor detailing of the position of bearing pad over reinforced concrete (RC) corbel may lead to premature failure, which is undesired and structurally vulnerable. An appropriate retrofitting solution is necessary to ensure the functionality of such RC corbels. Considering the growing popularity of external carbon fiber-reinforced polymer (CFRP) in retrofitting, this research examines the effectiveness of an externally wrapped unidirectional CFRP sheet and compares its performance against traditional retrofitting methods. Moreover, it is intended to fulfill the lack of extensive research on external CFRP application for corbel strengthening. A total of eight medium-scale corbel specimens were tested on vertical load. Observed premature failure due to placing the bearing pad near the edge of corbel was verified and the effectiveness of the proposed structural strengthening solutions was studied. Experimental results show that although the loading capacity of the damaged corbel due to the poor detailing of bearing pad position could not be fully recovered, the external CFRP wrapping method demonstrated superior performance over RC jacketing and was able to prevent localized failure. Further study based on non-linear 3D finite element analysis (FEA) was carried out to identify the governing parameters of each retrofitting solution. Numerical studies suggested important parameters of various retrofitting alternatives for higher capacity assurance. View Full-Text
Keywords: reinforced concrete (RC) corbels; retrofitting; carbon fiber-reinforced polymer; finite element analysis; residual capacity reinforced concrete (RC) corbels; retrofitting; carbon fiber-reinforced polymer; finite element analysis; residual capacity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Neupane, R.C.; Eddy, L.; Nagai, K. Investigation on Strengthening Approaches Adopted for Poorly Detailed RC Corbels. Fibers 2017, 5, 16.

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