Effect of Chloride Corrosion on Eccentric-Compression Response of Concrete Columns Reinforced with Steel-FRP Composite Bars
Publication: Journal of Composites for Construction
Volume 26, Issue 4
Abstract
This paper presents test results of eccentrically loaded concrete columns reinforced with steel fiber–reinforced polymer (FRP) composite bars (SFCBs) subjected to chloride corrosion. The first stage of the experimental work explored the tensile and compressive tests of various reinforcements (SFCBs with different cross section, steel, and FRP bars) used in the large reinforced-concrete (RC) columns after chloride corrosion with or without sustained stresses. The results showed that the tensile and compressive stress–strain relationships of SFCBs are characterized by stable secondary (post-yield) stiffness. The second stage of the testing investigated the structural performance of RC columns with various amounts and types of reinforcements, slenderness ratio, applied load eccentricity, and chloride corrosion rate. The results showed that the effect of reinforcements on eccentric compression behavior is significant. The deformation and crack width of SFCB-RC columns, respectively, decreased by 12.2%–52.6% and 8.5%–71.0%, while the load capacity improved by 0.9%–18.8%, when compared with the corresponding FRP-RC columns having the same eccentricity and reinforcement ratio. The use of SFCBs as the reinforcement of RC columns, especially with high reinforcement ratio or SFCBs having high area ratio of inner steel to SFCB, is beneficial to reducing the deflection and crack width as well as improve the bearing capacity utilization coefficients under a serviceability limit state.
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Acknowledgments
The authors would like to acknowledge the financial support provided by the Natural Science Foundation of Jiangsu Province, China (BK20201436), the China Postdoctoral Science Foundation (2018M642335), the National Natural Science Foundation of China (51678514, 51878315), the Science and Technology Project of Jiangsu Construction System (2018ZD047, 2021ZD06), the Science and Technology Project of Gansu Construction System (JK2021-19), the Blue Project Youth Academic Leader of Colleges and Universities in Jiangsu Province (2020), the Opening Foundation of Jiangsu Province Engineering Research Center of Prefabricated Building and Intelligent Construction, the Science and Technology Cooperation Fund Project of Yangzhou City, and Yangzhou University (YZU212105).
Notation
The following symbols are used in this paper:
- a
- parameter related to the shape of concrete compressive stress–strain curve;
- Asc
- sectional area of the reinforcing bars near the eccentric load;
- Ast
- sectional area of the reinforcing bars far from the eccentric load;
- asc
- distance between the centroid of compressive bars and its nearest section edge;
- ast
- distance between the centroid of tensile bars and its nearest section edge;
- d
- nominal diameter of each bar;
- dc
- corrosion duration;
- dlim
- deflection under serviceability limit state;
- dq
- deflection under quasi-permanent combination of loads;
- dr
- depth of outer rib;
- ds
- inner steel diameter of each SFCB;
- dt
- damage parameter of concrete under uniaxial tension;
- du
- ultimate deflection of column specimen;
- dy
- yield deflection of column specimen;
- d1
- spacing of dial gauges Type I;
- d2
- vertical distance between the end of the specimen and its nearest gauge;
- EI
- modulus of elasticity of SFCB;
- EII
- secondary stiffness of SFCB;
- Ec
- modulus of elasticity of concrete;
- EsI
- modulus of elasticity of steel rebar;
- EsII
- secondary stiffness of steel rebar;
- e0
- distance between the sectional centroid and compression loading point;
- fc
- compressive strength of concrete;
- fcu
- compressive strength of concrete cube;
- ffu
- ultimate strength of FRP rebar;
- frcu
- compressive ultimate strength of rebar;
- frcy
- compressive yield strength of rebar;
- frtu
- tensile ultimate strength of rebar;
- frty
- tensile yield strength of rebar;
- fsfu
- ultimate strength of SFCB;
- fsfy
- yield strength of SFCB;
- fsu
- ultimate strength of steel rebar;
- fsy
- yield strength of steel rebar;
- ftu
- concrete tensile strength;
- H
- height of specimen;
- h0
- sectional effective height;
- l0
- initial length;
- li
- measured length under ith loading stage;
- m0
- initial mass of specimen;
- mn
- mass of corroded specimen;
- Nωlim
- load corresponding to the crack width under serviceability limit state;
- Ndlim
- load corresponding to the deflection under serviceability limit state;
- Nq
- quasi-permanent combination of loads;
- Nu
- tested bearing capacity of the column specimen;
- Ny
- yield load of the column specimen;
- ra
- sectional area ratio of the inner steel core to SFCB;
- rav
- average value;
- rl
- sustained load level on column specimen;
- rm
- mass loss rate;
- rs
- stress level sustained in the tensile reinforcements;
- rsd
- standard deviation;
- sr
- spacing of outer rib;
- tf
- thickness of out-wrapped FRP layer;
- ud
- deflection ductility of column specimen;
- vt
- test value;
- εc0
- concrete compressive strain corresponding to fc;
- εci
- concrete strain under ith loading stage;
- εcu
- ultimate compressive strain of concrete;
- εfu
- ultimate strain of FRP rebar;
- εsf
- strain in SFCB;
- εsfc
- compressive strain in rebar near the eccentric load;
- εsft
- tensile strain in rebar far from the eccentric load;
- εsfu
- ultimate strain of SFCB;
- εsfy
- yield strain of SFCB;
- εsu
- ultimate strain of steel rebar;
- εsy
- yield strain of steel rebar;
- εt0
- concrete tensile strain corresponding to ftu;
- εtu
- ultimate tensile strain of concrete;
- ηd
- bearing capacity utilization coefficient controlled by the deflection under serviceability limited state;
- ηω
- bearing capacity utilization coefficient controlled by the crack width under serviceability limited state;
- λ
- slenderness ratio;
- ρsc
- area ratio of compressive bars to effective cross section;
- ρst
- area ratio of tensile bar to effective cross section;
- σsf
- stress in SFCB;
- ωlim
- crack width under serviceability limit state;
- ωq
- crack width under quasi-permanent combination of loads; and
- ωNaCl
- mass fraction of sodium chloride solution.
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Published In
Journal of Composites for Construction
Volume 26 • Issue 4 • August 2022
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© 2022 American Society of Civil Engineers.
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Received: Aug 28, 2021
Accepted: Apr 12, 2022
Published online: Jun 15, 2022
Published in print: Aug 1, 2022
Discussion open until: Nov 15, 2022
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- Wenjie Ge, Sukang Zhang, Zhiwen Zhang, Zhongwei Guan, Ashraf Ashour, Chuanzhi Sun, Weigang Lu, Dafu Cao, Eccentric compression behavior of Steel-FRP composite bars RC columns under coupling action of chloride corrosion and load, Structures, 10.1016/j.istruc.2023.02.090, 50, (1051-1068), (2023).