Behavior of CFSC-Encased Shear Connectors in Steel-Concrete Joints: Push-Out Tests
Publication: Journal of Structural Engineering
Volume 146, Issue 4
Abstract
A concrete-filled steel cell (CFSC) is commonly used in steel-concrete joints of hybrid girders. The performance of shear connectors embedded in CFSCs has been investigated in the current study in which a series of push-out tests were performed in order to assess the mechanical behavior of a perfobond strip connector (PBL) and headed steel studs. The failure modes, load-slip relations, load-strain relations, and the influence of the push-out test arrangement on such behaviors are presented and discussed in this study. Comparisons between the current experimental results and those presented in previous studies by the authors demonstrate that the average peak bond and residual bond strength at the interface between the perforated steel plate and the concrete in CFSC are 1.0 and 1.4 times higher than those derived from the plug-in type of push-out specimens (PI type), respectively. Moreover, it is found that the steel cell confinement has little impact on the performance of the transverse steel rebars of the PBL and the behavior of steel studs. Because the confinement provided by the steel cell is able to improve the shear capacity of the concrete dowel in the PBL, the ultimate shear capacity of the PBL encased in CFSC is 31% higher than that of the PBL without confinement. It is also discovered that the ultimate strengths of the PBL and the steel studs fabricated in CFSC could not be reached at the same time. Furthermore, the experimental results are compared to the shear resistances predicted by the available analytical equations for the PBLs without confinements. It is found that the ultimate shear resistances of the PBLs under the confinement are underestimated by the existing equations.
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Data Availability Statement
All data used during the study appear in the published article.
Acknowledgments
This work is supported by the National Natural Science Foundation of China (Grant No. 51908138), the Guangdong Provincial Education Bureau (Grant No. 2018KQNCX071), and the program of One-hundred Talents Program of Guangdong University of Technology (Grant No. 220413603). The support from Prof. Ayman Soliam Mosallam at UCI is also acknowledged.
References
Ahn, J., C. Lee, J. Won, and S. Kim. 2010. “Shear resistance of the perfobond-rib shear connector depending on concrete strength and rib arrangement.” J. Constr. Steel Res. 66 (10): 1295–1307. https://doi.org/10.1016/j.jcsr.2010.04.008.
Al-Darzi, S. Y. K., A. R. Chen, and Y. Q. Liu. 2007. “Finite element simulation and parametric studies of perfobond rib connector.” Am. J. Appl. Sci. 4 (3): 122–127. https://doi.org/10.3844/ajassp.2007.122.127.
Aly, T., M. Elchalakani, P. Thaylan, and I. Patnaikuni. 2010. “Incremental collapse threshold for pushout resistance of circular concrete filled steel tubular columns.” J. Constr. Steel Res. 66 (1): 11–18. https://doi.org/10.1016/j.jcsr.2009.08.002.
BSI (British Standard Institution). 2005. Design of composite steel and concrete structures: General rules and rules for buildings. EN 1994-1-1. London: BSI.
Candido-Martins, J. P. S., L. F. Costa-Neves, and P. C. G. S. Vellasco. 2010. “Experimental evaluation of the structural response of perfobond shear connectors.” Eng. Struct. 32 (8): 1976–1985. https://doi.org/10.1016/j.engstruct.2010.02.031.
Han, L. H., Z. B. Wang, X. Wu, and T. Zhong. 2015. “Behavior of concrete-encased CFST members under axial tension.” J. Struct. Eng. 142 (2): 04015149. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001422.
He, J., Y. Liu, and B. Pei. 2014. “Experimental study of the steel-concrete connection in hybrid cable-stayed bridges.” J. Perform. Constr. Facil. 28 (3): 559–570. https://doi.org/10.1061/(ASCE)CF.1943-5509.0000444.
He, S., Z. Fang, Y. Fang, M. Liu, L. Liu, and A. S. Mosallam. 2016. “Experimental study on perfobond strip connector in steel-concrete joints of hybrid bridges.” J. Constr. Steel Res. 118 (Mar): 169–179. https://doi.org/10.1016/j.jcsr.2015.11.009.
He, S., Z. Fang, and A. Mosallam. 2017. “Push-out tests for perforbond strip connectors with UHPC grout in the joints of steel-concrete hybrid bridge girders.” Eng. Struct. 135 (C): 177–190. https://doi.org/10.1016/j.engstruct.2017.01.008.
He, S., A. Mosallam, Z. Fang, C. Zou, W. X. Feng, and J. Su. 2018. “Experimental study on CFSC encased shear connectors in steel-concrete composite joints with UHPC grout.” Constr. Build. Mater. 173 (Jun): 638–649. https://doi.org/10.1016/j.conbuildmat.2018.04.086.
JSCE (Japan Society of Civil Engineers). 2009. Standard specifications for steel and composite structures. 1st ed. Tokyo: JSCE.
Leonhard, F., W. Andra, H. P. Andra, and W. Harre. 1987. “New, improved bonding means for composite load bearing structures with high fatigue strength.” Beton-Stahlbetonbau. 82 (12): 325–331. https://doi.org/10.1016/0142-1123(89)90207-7.
Liu, R., and Y. Liu. 2015. “Analysis of auxiliary ribs in steel-concrete joint of hybrid girder.” J. Constr. Steel Res. 112 (Sep): 363–372. https://doi.org/10.1016/j.jcsr.2015.05.015.
Ma, Y., and Y. Wang. 2012. “Creep of high strength concrete filled steel tube columns.” Thin Walled Struct. 53 (Apr): 91–98. https://doi.org/10.1016/j.tws.2011.12.012.
Medbery, S. B., and B. M. Shahrooz. 2002. “Perfobond shear connectors for composite construction.” Eng. J. 39 (1): 2–12.
Nie, J. 2011. Steel-concrete composite bridges. Beijing: China Communications Press.
Oguejiofor, E. C. and M. U. Hosain. 1993. “A parametric study of perfobond rib connectors.” Can. J. Civ. Eng. 21: 614–625. https://doi.org/10.1139/l94-063.
Oguejiofor, E. C., and M. U. Hosain. 1997. “Numerical analysis of push-out specimens with perfobond rib connectors.” Comput. Struct. 62 (4): 617–624. https://doi.org/10.1016/S0045-7949(96)00270-2.
Roeder, C. W., B. Cameron, and C. B. Brown. 1999. “Composite action in concrete filled tubes.” J. Struct. Eng. 125 (5): 477–484. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:5(477).
Shakir-Khalil, H. 1993. “Pushout strength of concrete-filled steel hollow sections.” J. Struct. Eng. 71 (13): 230–243.
Studnicka, J., J. Machacek, and A. Krpata. 2002. “Perforated shear connector for composite steel and concrete beams.” In Proc., Composite Construction in Steel and Concrete IV, 367–378. Reston, VA: ASCE.
Su, Q., W. Wang, H. Luan, and G. Yang. 2014. “Experimental research on bearing mechanism of perfobond rib shear connectors.” J. Constr. Steel Res. 95 (Apr): 22–31. https://doi.org/10.1016/j.jcsr.2013.11.020.
Su, Q., G. Yang, and M. A. Bradford. 2016. “Bearing capacity of perfobond RIB shear connectors in composite girder bridges.” J. Bridge Eng. 21 (4): 06015009. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000865.
Valente, I., and P. J. S. Cruz. 2004. “Experimental analysis of perfobond shear connection between steel and lightweight concrete.” J. Constr. Steel Res. 60 (3–5): 465–479. https://doi.org/10.1016/S0143-974X(03)00124-X.
Valente, I., and P. J. S. Cruz. 2009. “Experimental analysis of shear connection between steel and lightweight concrete.” J. Constr. Steel Res. 60 (3): 465–479. https://doi.org/10.1016/j.jcsr.2009.06.001.
Vianna, J. C., S. A. L. Andrade, P. C. G. S. Vellasco, and L. F. Costa-Neves. 2013. “Experimental study of perfobond shear connectors in composite construction.” J. Constr. Steel Res. 81 (Feb): 62–75. https://doi.org/10.1016/j.jcsr.2012.11.002.
Vincent, T., and T. Ozbakkaloglu. 2015. “Influence of shrinkage on compressive behavior of concrete-filled FRP tubes: An experimental study on interface gap effect.” Constr. Build. Mater. 75 (Jan): 144–156. https://doi.org/10.1016/j.conbuildmat.2014.10.038.
Wang, W., C. Zhao, Q. Li, and W. Zhuang. 2014. “Study on load-slip characteristic curves of perfobond shear connectors in hybrid structures.” J. Adv. Concr. Technol. 12 (10): 413–424. https://doi.org/10.3151/jact.12.413.
Xu, C., C. Huang, D. Jiang, and Y. Song. 2009. “Push-out test of pre-stressing concrete filled circular steel tube columns by means of expansion cement.” Constr. Build. Mater. 23 (1): 491–497. https://doi.org/10.1016/j.conbuildmat.2007.10.021.
Yoshitaka, U., H. Tetsuya, and M. Kaoru. 2001. “An experimental study on shear characteristics of perfobond strip and its rational strength equations.” In Int. Symp. on Connections between Steel and Concrete, 1066–1075. Paris: RILEM Publications SARL.
Zheng, S., Y. Liu, T. Yoda, and W. Lin. 2016. “Parametric study on shear capacity of circular-hole and long-hole perfobond shear connector.” J. Constr. Steel Res. 117 (Feb): 64–80. https://doi.org/10.1016/j.jcsr.2015.09.012.
Zhong, T., T. Song, B. Uy, and L. Han. 2016. “Bond behavior in concrete-filled steel tubes.” J. Constr. Steel Res. 120 (Apr): 81–93. https://doi.org/10.1016/j.jcsr.2015.12.030.
Zhouhong, Z., and C. Huimin. 1999. “Experimental study of shear connector under static and fatigue loading.” J. Fuzhou Univ. (Nat. Sci.) 27 (6): 61–66. https://doi.org/10.3969/j.issn.1000-2243.1999.06.014.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Dec 10, 2018
Accepted: Sep 10, 2019
Published online: Jan 17, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 17, 2020
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