Experimental Study on FRP–Reinforced Concrete–Steel Double-Skin Tubular Columns under Eccentric Compression Loads
Publication: Journal of Composites for Construction
Volume 25, Issue 6
Abstract
Fiber-reinforced polymer (FRP) reinforced concrete-steel double-skin tubular columns (DSTCs) consist of an exterior glass FRP tube, an interior steel tube, and reinforced concrete in between. They have attracted the attention of researchers owing to their high ductility, lightweightedness, resistance to corrosion, and ease of construction. However, studies regarding FRP-reinforced concrete-steel DSTCs under eccentric loading are fewer compared with those regarding unreinforced DSTCs. To investigate the behavior of composite columns under eccentric compression, 12 circular cross-section columns with a height of 700 mm and an outer diameter of 210 mm were tested. They included two axial compression columns and 10 eccentric compression columns. The main parameters considered were the eccentricity, void ratio, longitudinal reinforcement ratio, and concrete strength. The results showed that the arrangement of steel bars inside the hybrid DSTCs could improve the eccentric carrying capacity and ductility of the composite columns. Furthermore, this study showed that the eccentric carrying capacity and initial stiffness decreased as the eccentricity and void ratio increased, whereas they increased with the longitudinal reinforcement ratio and concrete strength. The growth rate of the carrying capacity decreased when the longitudinal reinforcement ratio increased to 3.66%. When the void ratio exceeded 0.5 and the eccentricity ratio was 0.4, the ductility and carrying capacity decreased. Finally, a simplified model was proposed to predict the axial load–moment curves of reinforced DSTCs. The theoretical predictions were in good agreement with the experimental results of this study.
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Acknowledgments
This work was supported by the Youth Fund of Chinese National Natural Science Foundation (No. 51808100) and the Natural Science Foundation of Liaoning Province (No. 20170540303).
Notation
The following symbols are used in this paper:
- Acc
- sectional area of the concrete in the compression zone;
- Af
- sectional area of the GFRP tube;
- Afc, Aft
- sectional areas of the GFRP tube under compressive and tensile stresses, respectively;
- Ar
- sectional area of longitudinal reinforcement;
- As
- sectional area of the steel tube;
- Asc, Ast
- sectional areas of steel tube under compressive and tensile stresses, respectively;
- Eo
- secant modulus of unconfined concrete under peak stress;
- Es
- elastic modulus of steel tube;
- compressive strength of confined concrete;
- compressive strength of unconfined concrete;
- equivalent confining pressure provided by the GFRP tube;
- fyr, fys
- yield strength of reinforcement and steel tube, respectively;
- n
- number of longitudinal reinforcements;
- Pu
- ultimate load;
- q
- external pressure applied to the concrete cylinder;
- R
- section radius;
- Ro
- outer radius of sandwich concrete;
- r
- outer radius of steel tube;
- tfrp
- thickness of the GFRP tube;
- ts
- thickness of the steel tube;
- x
- height of the compression zone;
- ycon, yfc, yft, ysc, yst
- distances from centroid of areas Acc, Afc, yft, Asc and Ast to the center line;
- yi
- distance from the ith steel bar to the center line;
- ɛcc
- ultimate strain of confined concrete;
- ɛco
- ultimate strain of unconfined concrete;
- ɛh,rup
- rupture hoop strain of the GFRP tube;
- θ, θ′
- center angles of concrete height boundary line at the positions of the GFRP tube and steel tube;
- ρK
- stiffness constraint ratio expressed as ρK = (Eh,gfrptfrp/EoRo);
- ρɛ
- strain ratio expressed as ρɛ = (ɛh,rup/ɛco);
- σfc, σft
- axial compressive strength and axial tensile strength of the GFRP tube, respectively; and
- σrt,i, σrc,i
- stresses of the ith steel bar in tension and compression zones, respectively.
References
ASTM. 2014. Standard specification for hot-formed welded and seamless carbon steel structural tubing. ASTM A501/A501M-14. West Conshohocken, PA: ASTM.
ASTM. 2016. Standard test method for apparent hoop tensile strength of plastic or reinforced plastic pipe. ASTM D2290-16. West Conshohocken, PA: ASTM.
Chen, Z. L., J. Y. Wang, J. Chen, H. GangaRao, R. F. Liang, and W. Q. Liu. 2020. “Responses of concrete-filled FRP tubular and concrete-filled FRP–steel double skin tubular columns under horizontal impact.” Thin-Walled Struct. 155 (3): 106941. https://doi.org/10.1016/j.tws.2020.106941.
CNS (China National Standard). 2010. Metallic materials. Tensile testing. Part 1: Method of test at room temperature. GB/T 228.1. Beijing: China Standard Press.
CNS (China National Standard). 2019. Standard for test method of mechanical properties on ordinary concrete. GB/T 50081. Beijing: China Standard Press.
Fanggi, B. A. L., and T. Ozbakkaloglu. 2013. “Compressive behavior of aramid FRP–HSC–steel double-skin tubular columns.” Constr. Build. Mater. 48: 554–565. https://doi.org/10.1016/j.conbuildmat.2013.07.029.
Han, L. H., Z. Tao, F. Y. Liao, and Y. Xu. 2010. “Tests on cyclic performance of FRP–concrete–steel double-skin tubular columns.” Thin-Walled Struct. 48 (6): 430–439. https://doi.org/10.1016/j.tws.2010.01.007.
He, K., Y. Chen, and Y. Yan. 2020. “Axial mechanical properties of concrete-filled GFRP tubular hollow composite columns.” Compos. Struct. 243: 112174. https://doi.org/10.1016/j.compstruct.2020.112174.
Huang, Z. Y., Y. W. Zhou, G. T. Hu, W. Deng, H. Gao and L. Sui. 2021. “Flexural resistance and deformation behaviour of CFRP–ULCC–steel sandwich composite structures.” Compos. Struct. 257: 113080. https://doi.org/10.1016/j.compstruct.2020.113080.
Jamatia, R., and A. Deb. 2020. “FRP confined hollow concrete columns under axial compression: A comparative assessment.” Compos. Struct. 236: 111857. https://doi.org/10.1016/j.compstruct.2020.111857.
Lignola, G. P., A. Prota, G. Manfredi, and E. Cosenza. 2008. “Unified theory for confinement of RC solid and hollow circular columns.” Composites, Part B 39 (7–8): 1151–1160. https://doi.org/10.1016/j.compositesb.2008.03.007.
Liu, M., and J. Qian. 2009. “Moment–curvature relationship of FRP–concrete–steel double-skin tubular members.” Front. Archit. Civ. Eng. China 3 (1): 25–31. https://doi.org/10.1007/s11709-009-0012-7.
Ozbakkaloglu, T., and B. A. L. Fanggi. 2014. “Axial compressive behavior of FRP–concrete–steel double-skin tubular columns made of normal- and high-strength concrete.” J. Compos. Constr. 18 (1): 04013027. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000401.
Ozbakkaloglu, T., and B. A. L. Fanggi. 2015. “FRP–HSC–steel composite columns: Behavior under monotonic and cyclic axial compression.” Mater. Struct. 48 (4): 1075–1093. https://doi.org/10.1617/s11527-013-0216-0.
Ozbakkaloglu, T., B. A. L. Fanggi, and J. Zheng. 2016. “Confinement model for concrete in circular and square FRP–concrete–steel double-skin composite columns.” Mater. Des. 96: 458–469. https://doi.org/10.1016/j.matdes.2016.02.027.
Ozbakkaloglu, T., and Y. Idris. 2014. “Seismic behavior of FRP-high-strength concrete–steel double-skin tubular columns.” J. Struct. Eng. 140 (6): 04014019. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000981.
Talaeitaba, S. B., M. Halabian, and M. Ebrahim Torki. 2015. “Nonlinear behavior of FRP-reinforced concrete-filled double-skin tubular columns using finite element analysis.” Thin-Walled Struct. 95: 389–407. https://doi.org/10.1016/j.tws.2015.07.018.
Teng, J. G., T. Yu, Y. L. Wong, and S. L. Dong. 2007. “Hybrid FRP–concrete–steel tubular columns: Concept and behavior.” Constr. Build. Mater. 21 (4): 846–854. https://doi.org/10.1016/j.conbuildmat.2006.06.017.
Wang, R., L. H. Han, and Z. Tao. 2015. “Behavior of FRP–concrete–steel double skin tubular members under lateral impact: Experimental study.” Thin-Walled Struct. 95: 363–373. https://doi.org/10.1016/j.tws.2015.06.022.
Wang, W. Q., C. Q. Wu, and J. Li. 2018. “Numerical simulation of hybrid FRP–concrete–steel double-skin tubular columns under close-range blast loading.” J. Compos. Constr. 22 (5): 04018036. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000871.
Wang, W. Q., C. Q. Wu, Z. X. Liu, and K. X. An. 2020. “Experimental investigation on the hybrid FRP–UHPC–steel double-skin tubular columns under lateral impact loading.” J. Compos. Constr. 24 (5): 04020041. https://doi.org/10.1061/(ASCE)CC.1943-5614.0001057.
Wang, W. Q., C. Q. Wu, Y. Yu, and J. J. Zeng. 2021. “Dynamic responses of hybrid FRP–concrete–steel double-skin tubular column (DSTC) under lateral impact.” Structures 32: 1115–1144. https://doi.org/10.1016/j.istruc.2021.02.062.
Wong, Y. L., T. Yu, J. G. Teng, and S. L. Dong. 2008. “Behavior of FRP-confined concrete in annular section columns.” Composites, Part B 39 (3): 451–466. https://doi.org/10.1016/j.compositesb.2007.04.001.
Yu, T., and J. G. Teng. 2013. “Behavior of hybrid FRP–concrete–steel double-skin tubular columns with a square outer tube and a circular inner tube subjected to axial compression.” J. Compos. Constr. 17 (2): 271–279. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000331.
Yu, T., J. G. Teng, and Y. L. Wong. 2010a. “Stress–strain behavior of concrete in hybrid FRP–concrete–steel double-skin tubular columns.” J. Struct. Eng. 136 (4): 379–389. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000121.
Yu, T., Y. L. Wong, and J. G. Teng. 2010b. “Behavior of hybrid FRP–concrete–steel double-skin tubular columns subjected to eccentric compression.” Adv. Struct. Eng. 13 (5): 961–974. https://doi.org/10.1260/1369-4332.13.5.961.
Yu, T., Y. L. Wong, J. G. Teng, S. L. Dong, and E. S. Lam. 2006. “Flexural behavior of hybrid FRP–concrete–steel double-skin tubular members.” J. Compos. Constr. 10 (5): 443–452. https://doi.org/10.1061/(ASCE)1090-0268(2006)10:5(443).
Yu, T., B. Zhang, Y. B. Cao, and J. G. Teng. 2012. “Behavior of hybrid FRP–concrete–steel double-skin tubular columns subjected to cyclic axial compression.” Thin-Walled Struct. 61: 196–203. https://doi.org/10.1016/j.tws.2012.06.003.
Yu, T., S. Zhang, L. Huang, and C. Chan. 2017. “Compressive behavior of hybrid double-skin tubular columns with a large rupture strain FRP tube.” Compos. Struct. 171: 10–18. https://doi.org/10.1016/j.compstruct.2017.03.013.
Zeng, J. J., J. F. Lv, G. Lin, Y. C. Guo, and L. J. Li. 2018a. “Compressive behavior of double-tube concrete columns with an outer square FRP tube and an inner circular high-strength steel tube.” Constr. Build. Mater. 184: 668–680. https://doi.org/10.1016/j.conbuildmat.2018.07.034.
Zeng, J. J., Y. Z. Zheng, and Y. L. Long. 2021. “Axial compressive behavior of FRP–concrete–steel double skin tubular columns with a rib-stiffened Q690 steel tube and ultra-high strength concrete.” Compos. Struct. 268: 113912. https://doi.org/10.1016/j.compstruct.2021.113912.
Zeng, L., L. Li, Z. Su, and F. Liu. 2018b. “Compressive test of GFRP–recycled aggregate concrete–steel tubular long columns.” Constr. Build. Mater. 176: 295–312. https://doi.org/10.1016/j.conbuildmat.2018.05.068.
Zeng, L., L. Li, P. Xiao, J. Zeng, and F. Liu. 2020. “Experimental study of seismic performance of full-scale basalt FRP–recycled aggregate concrete–steel tubular columns.” Thin-Walled Struct. 151: 106185. https://doi.org/10.1016/j.tws.2019.106185.
Zhang, B., J. G. Teng, and T. Yu. 2015. “Experimental behavior of hybrid FRP–concrete–steel double-skin tubular columns under combined axial compression and cyclic lateral loading.” Eng. Struct. 99: 214–231. https://doi.org/10.1016/j.engstruct.2015.05.002.
Zhao, J. L., J. G. Teng, T. Yu, and L. J. Li. 2016. “Behavior of large-scale hybrid FRP–concrete–steel double-skin tubular beams with shear connectors.” J. Compos. Constr. 20 (5): 04016015. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000669.
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Published In
Journal of Composites for Construction
Volume 25 • Issue 6 • December 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 22, 2021
Accepted: Aug 6, 2021
Published online: Sep 24, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 24, 2022
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