Abstract
The post-earthquake repairability of building structures is attracting attention as much as its safety properties. Concrete-filled steel tube (CFT) columns are widely used for high-rise buildings in earthquake areas due to their excellent seismic performance. In this paper, through experimental and numerical analysis, the seismic behavior and deformation performance of steel-reinforced CFT (RCFT) and X steel-reinforced CFT (XRCFT) columns using ultra-high-strength steel rebar are studied, and the influence of built-in steel bars on the seismic performance of traditional CFT columns is studied. A simple cumulative numerical analysis model is proposed to predict the seismic capacity curve of these built-in reinforced CFT columns. Experimental results verify that the use of ultra-high-strength steel bars greatly improves the resistance of the traditional CFT columns under an earthquake load. Their energy absorption properties are reduced, however, the buckling of the steel tubes was delayed and the peak deformation and the ductility of the columns all increase significantly. The model proposed is proven to reasonably predict the seismic capacity curves of RCFT and XRCFT columns. Compared with other cases, the ultra-high-strength steel bars can present a better-enhancing effect on the seismic performance of the long-span CFT columns dominated mainly by bending deformation.
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The authors are grateful for the grant support from the Obayashi Foundation (Japan).
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The research funding of the paper was provided by the Obayashi Foundation.
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Cai, G., Fujinaga, T., Si Larbi, A. et al. Cyclic behavior of RCFT columns with large D/t ratio steel tubes: Effect of reinforcement arrangement. Bull Earthquake Eng 21, 4565–4588 (2023). https://doi.org/10.1007/s10518-023-01696-w
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DOI: https://doi.org/10.1007/s10518-023-01696-w