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Polymers 2016, 8(9), 323; doi:10.3390/polym8090323

Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak Directions

1
Technical and Vocational University (TVU), Brazil St., No. 4, Tehran 1435761137, Iran
2
Istanbul Technical University, Ayazaga, Sariyer, Istanbul 34469, Turkey
*
Author to whom correspondence should be addressed.
Academic Editors: Alexander Böker and Frank Wiesbrock
Received: 14 July 2016 / Revised: 19 August 2016 / Accepted: 22 August 2016 / Published: 2 September 2016
View Full-Text   |   Download PDF [5632 KB, uploaded 2 September 2016]   |  

Abstract

Although many theoretical and experimental studies are available on external confinement of columns using fiber-reinforced polymer (FRP) jackets, as well as numerous models proposed for the axial stress-axial strain relation of concrete confined with FRP jackets, they have not been validated with a sufficient amount and variety of experimental data obtained through full-scale tests of reinforced concrete (RC) columns with different geometrical and mechanical characteristics. Particularly, no systematical experimental data have been presented on full-scale rectangular substandard RC columns subjected to reversed cyclic lateral loads along either their strong or weak axes. In this study, firstly, test results of five full-scale rectangular substandard RC columns with a cross-sectional aspect ratio of two (300 mm × 600 mm) are briefly summarized. The columns were tested under constant axial load and reversed cyclic lateral loads along their strong or weak axes before and after retrofitting with external FRP jackets. In the second stage, inelastic lateral force-displacement relationships of the columns are obtained analytically, making use of the plastic hinge assumption and different FRP confinement models available in the literature. Finally, the analytical findings are compared with the test results for both strong and weak directions of the columns. Comparisons showed that use of different models for the stress-strain relationship of FRP-confined concrete can yield significantly non-conservative or too conservative retrofit designs, particularly in terms of deformation capacity. View Full-Text
Keywords: column; confinement; FRP; reinforced concrete; retrofitting; seismic; substandard column; confinement; FRP; reinforced concrete; retrofitting; seismic; substandard
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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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Farrokh Ghatte, H.; Comert, M.; Demir, C.; Ilki, A. Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak Directions. Polymers 2016, 8, 323.

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