Steel and Composite Structures

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Seismic experiment and analysis of rectangular bottom strengthened steel-concrete composite columns

  • Hui, Cun (School of Architecture and Civil Engineering, Zhongyuan University of Technology) ;
  • Zhu, Yanzhi (School of Architecture and Civil Engineering, Zhongyuan University of Technology) ;
  • Cao, Wanlin (College of Architecture and Civil Engineering, Beijing University of Technology) ;
  • Wang, Yuanqing (Department of Civil Engineering, Tsinghua University)
  • Received : 2015.09.11
  • Accepted : 2015.11.14
  • Published : 2016.02.29
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Abstract

In order to study the working mechanism of rectangular steel-concrete composite columns subjected to compression-bending load and further determine the seismic performance index, a bottom strengthened rectangular steel reinforced concrete (SRC) column with concealed steel plates and a bottom strengthened rectangular concrete filled steel tube (CFST) columns were proposed. Six column models with different configurations were tested under horizontal low cyclic loading. Based on the experiments, the load-bearing capacity, stiffness and degradation process, ductility, hysteretic energy dissipation capacity, and failure characteristics of the models were analyzed. The load-bearing capacity calculation formulas for a normal section and an oblique section of bottom strengthened rectangular steel-concrete composite columns were pesented and a finite element (FE) numerical simulation of the classical specimens was performed. The study shows that the load-bearing capacity, ductility, and seismic energy dissipation capacity of the bottom strengthened rectangular steel-concrete composite columns are significantly improved compared to the conventional rectangular steel-concrete composite columns and the results obtained from the calculation and the FE numerical simulation are in good agreement with those from the experiments. The rectangular steel-concrete composite column with bottom strengthened shows better seismic behavior and higher energy dissipation capacity under suitable constructional requirements and it can be applied to the structure design of high-rise buildings.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Education Commission

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