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Steel and Composite Structures Volume 47, Number 1, April10 2023 , pages 121-134 DOI: https://doi.org/10.12989/scs.2023.47.1.121 |
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Seismic performance and damage evaluation of concrete-encased CFST composite columns subjected to different loading systems |
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Xiaojun Ke, Haibin Wei, Linjie Yang and Jin An
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| Abstract | ||
| This paper tested 11 concrete-encased concrete-filled steel tube (CFST) composite columns and one reinforced concrete column under combined axial compression and lateral loads. The primary parameters, including the loading system, axial compression ratio, volume stirrup ratio, diameter-to-thickness ratio of the steel tube, and stirrup form, were varied. The influence of the parameters on the failure mode, strength, ductility, energy dissipation, strength degradation, and damage evolution of the composite columns were revealed. Moreover, a two-parameter nonlinear seismic damage model for composite columns was established, which can reflect the degree and development process of the seismic damage. In addition, the relationships among the inter-story drift ratio, damage index and seismic performance level of composite columns were established to provide a theoretical basis for seismic performance design and damage assessments. | ||
| Key Words | ||
| composite column; concrete-filled steel tube; damage model; loading system; performance level | ||
| Address | ||
| Xiaojun Ke:1)College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China 2)Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China Haibin Wei, Linjie Yang and Jin An:College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China | ||