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Computers and Concrete Volume 31, Number 2, February 2023 , pages 123-137 DOI: https://doi.org/10.12989/cac.2023.31.2.123 |
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Composite effects of circular concrete-filled steel tube columns under lateral shear load |
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Faxing Ding, Changbin Liao, Chang He, Wei Gao, Liping Wang, Fei Lyu, Yuanguang Qiu and Jianjun Yang
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| Abstract | ||
| To fully understand shear mechanisms and composite effects of circular concrete-filled steel tube (CFST) columns, systematic numerical investigations were conducted in this paper by improved finite element models. The triaxial plasticdamage constitutive model of the concrete and the interactions between the concrete and steel tube were considered. Afterwards, the critical and upper bound shear span ratios of the circular CFST column under lateral shear loading were determined. The composite effects between the two materials were analyzed by comparing the shear resistance with plain concrete column and hollow steel tube. In addition, a method that predicts the shear bearing capacity of a circular CFST column was proposed. The confining effects on the concrete core and the restraining effects on the steel tube were considered in this method. The proposed formula can predict more accurate results than the methods in different codes and references. | ||
| Key Words | ||
| circular concrete-filled steel tube column; composite effect; critical shear span; finite element model; shear strength | ||
| Address | ||
| Faxing Ding: 1) School of Civil Engineering, Central South University, 22 South Shanshan Rd., Changsha, China, 2) Engineering Technology Research Center for Prefabricated Construction Industrialization of Hunan Province, 22 South Shaoshan Rd., Changsha, China Changbin Liao, Chang He, Wei Gao, Liping Wang, and Fei Lyu: School of Civil Engineering, Central South University, 22 South Shanshan Rd., Changsha, China Yuanguang Qiu and Jianjun Yang: China Railway Urban Construction Group Co., Ltd., 693 Yanghu Rd., Changsha, China | ||