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Computers and Concrete Volume 33, Number 6, June 2024 , pages 643-658 DOI: https://doi.org/10.12989/cac.2024.33.6.643 |
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Refined finite element modelling of circular CFST bridge piers subjected to the seismic load |
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Faxing Ding, Qingyuan Xu, Hao Sun and Fei Lyu
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| Abstract | ||
| To date, shell-solid and fibre element model analysis are the most commonly used methods to investigate the seismic performance of concrete-filled steel tube (CFST) bridge piers. However, most existing research does not consider the loss of bearing capacity caused by the fracture of the outer steel tube. To fill this knowledge gap, a refined finite element (FE) model considering the ductile damage of steel tubes and the behaviour of infilled concrete with cracks is established and verified against experimental results of unidirectional, bidirectional cyclic loading tests and pseudo-dynamic loading tests. In addition, a parametric study is conducted to investigate the seismic performance of CFST bridge piers with different concrete strength, steel strength, axial compression ratio, slenderness ratio and infilled concrete height using the proposed model. The validation shows that the proposed refined FE model can effectively simulate the residual displacement of CFST bridge piers subjected to highintensity earthquakes. The parametric analysis indicates that CFST piers hold sufficient strength reserves and sound deformation capacity and, thus, possess excellent application prospects for bridge construction in high-intensity areas. | ||
| Key Words | ||
| bridge piers; concrete-filled steel tube; concrete crack; finite element model; metal ductile damage; seismic | ||
| Address | ||
| Faxing Ding: 1) School of Civil Engineering, Central South University, Changsha, Hunan Province, 410075, P.R. China, 2) Engineering Technology Research Center for Prefabricated Construction Industrialization of Hunan Province, Changsha, 410075, P. R. China Qingyuan Xu, Hao Sun and Fei Lyu: School of Civil Engineering, Central South University, Changsha, Hunan Province, 410075, P.R. China | ||