Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak Directions
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...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2016-09-01
|
Series: | Polymers |
Subjects: | |
Online Access: | http://www.mdpi.com/2073-4360/8/9/323 |
id |
doaj-6c5b10633dfd4bb980266b4d50bacc2e |
---|---|
record_format |
Article |
spelling |
doaj-6c5b10633dfd4bb980266b4d50bacc2e2020-11-24T22:08:33ZengMDPI AGPolymers2073-43602016-09-018932310.3390/polym8090323polym8090323Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak DirectionsHamid Farrokh Ghatte0Mustafa Comert1Cem Demir2Alper Ilki3Technical and Vocational University (TVU), Brazil St., No. 4, Tehran 1435761137, IranIstanbul Technical University, Ayazaga, Sariyer, Istanbul 34469, TurkeyIstanbul Technical University, Ayazaga, Sariyer, Istanbul 34469, TurkeyIstanbul Technical University, Ayazaga, Sariyer, Istanbul 34469, TurkeyAlthough 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.http://www.mdpi.com/2073-4360/8/9/323columnconfinementFRPreinforced concreteretrofittingseismicsubstandard |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hamid Farrokh Ghatte Mustafa Comert Cem Demir Alper Ilki |
spellingShingle |
Hamid Farrokh Ghatte Mustafa Comert Cem Demir Alper Ilki 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 column confinement FRP reinforced concrete retrofitting seismic substandard |
author_facet |
Hamid Farrokh Ghatte Mustafa Comert Cem Demir Alper Ilki |
author_sort |
Hamid Farrokh Ghatte |
title |
Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak Directions |
title_short |
Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak Directions |
title_full |
Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak Directions |
title_fullStr |
Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak Directions |
title_full_unstemmed |
Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak Directions |
title_sort |
evaluation of frp confinement models for substandard rectangular rc columns based on full-scale reversed cyclic lateral loading tests in strong and weak directions |
publisher |
MDPI AG |
series |
Polymers |
issn |
2073-4360 |
publishDate |
2016-09-01 |
description |
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. |
topic |
column confinement FRP reinforced concrete retrofitting seismic substandard |
url |
http://www.mdpi.com/2073-4360/8/9/323 |
work_keys_str_mv |
AT hamidfarrokhghatte evaluationoffrpconfinementmodelsforsubstandardrectangularrccolumnsbasedonfullscalereversedcycliclateralloadingtestsinstrongandweakdirections AT mustafacomert evaluationoffrpconfinementmodelsforsubstandardrectangularrccolumnsbasedonfullscalereversedcycliclateralloadingtestsinstrongandweakdirections AT cemdemir evaluationoffrpconfinementmodelsforsubstandardrectangularrccolumnsbasedonfullscalereversedcycliclateralloadingtestsinstrongandweakdirections AT alperilki evaluationoffrpconfinementmodelsforsubstandardrectangularrccolumnsbasedonfullscalereversedcycliclateralloadingtestsinstrongandweakdirections |
_version_ |
1725816006948945920 |