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Steel and Composite Structures Volume 38, Number 4, February25 2021 , pages 431-445 DOI: https://doi.org/10.12989/scs.2021.38.4.431 |
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Shear behavior of concrete-encased square concrete-filled steel tube members: Experiments and strength prediction |
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Yong Yang, Xin Chen, Yicong Xue, Yunlong Yu and Chaorui Zhang
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| Abstract | ||
| This paper presents experiments and theoretical analysis on shear behavior of eight concrete-encased square concrete-filled steel tube (CECFST) specimens and three traditional reinforced concrete (RC) specimens. A total of 11 specimens with the test parameters including the shear span-to-depth ratio, steel tube size and studs arrangement were tested to explore the shear performance of CECFST specimens. The failure mode, shear capacity and displacement ductility were thoroughly evaluated. The test results indicated that all the test specimens failed in shear, and the CECFST specimens enhanced by the interior CFST core exhibited higher shear capacity and better ductility performance than that of the RC specimens. When the other parameters were the same, the larger steel tube size, the smaller shear span-to-depth ratio and the existence of studs could lead to the more satisfactory shear behavior. Then, based on the compatible truss-arch model, a set of formulas were developed to analytically predict the shear strength of the CECFST members by considering the compatibility of deformation between the truss part, arch part and the steel tube. Compared with the calculated results based on several current design specifications, the proposed formulas could get more accurate prediction. | ||
| Key Words | ||
| concrete-encased square concrete-filled steel tube members (CECFST); shear capacity; experimental study; compatible truss-arch model; calculation method | ||
| Address | ||
| Yong Yang and Yunlong Yu: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, P.R. China; Key Lab of Structural Engineering and Earthquake Resistance of the Ministry of Education, Xi'an University of Architecture and Technology, Xi'an, Shaanxi, P.R. China Xin Chen, Yicong Xue and Chaorui Zhang: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, P.R. China | ||