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<p>The behavior of reinforced concrete (RC) square columns strengthened with self-compacting concrete (SCC)-filled steel tubes under cyclic loading was experimentally investigated. Tests were carried out on eleven reinforced columns and one unreinforced column. The parameters studied for the strengthened columns included axial compression ratio, reinforcement rate, defect rate, strength of SCC, and the section form of a reinforced steel tube. The results show that the steel tube SCC reinforcement method can effectively strengthen RC columns, exert the restraint effect of steel tube, and delay the development of internal concrete cracks. The method can also significantly improve the bearing capacity of RC columns. Regarding ductility, the improvement of the reinforced column is obvious, the deformation resistance of the specimen is enhanced, and the degradation of stiffness and strength is relatively slow, indicating that it has good seismic performance.</p>

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Seismic performance of RC square columns strengthened with self-compacting concrete-filled steel tubes

  • 期刊论文

  • 发表日期：

    2025年7月26日

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  • Zhaoqiang Zhang,
  • Yang Cao,
  • Yanru Sa,
  • Huiyu Mu,
  • Xiaowei Li

摘要

The behavior of reinforced concrete (RC) square columns strengthened with self-compacting concrete (SCC)-filled steel tubes under cyclic loading was experimentally investigated. Tests were carried out on eleven reinforced columns and one unreinforced column. The parameters studied for the strengthened columns included axial compression ratio, reinforcement rate, defect rate, strength of SCC, and the section form of a reinforced steel tube. The results show that the steel tube SCC reinforcement method can effectively strengthen RC columns, exert the restraint effect of steel tube, and delay the development of internal concrete cracks. The method can also significantly improve the bearing capacity of RC columns. Regarding ductility, the improvement of the reinforced column is obvious, the deformation resistance of the specimen is enhanced, and the degradation of stiffness and strength is relatively slow, indicating that it has good seismic performance.