Techno Press

Steel and Composite Structures   Volume 20, Number 3, February29 2016, pages 599-621
Seismic experiment and analysis of rectangular bottom strengthened steel-concrete composite columns
Cun Hui, Yanzhi Zhu, Wanlin Cao and Yuanqing Wang

Abstract     [Full Text]
    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 loadbearing 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 highrise buildings.
Key Words
    composite column; steel-concrete; seismic experiment; rectangular section; load-bearing capacity calculation; numerical simulation; finite element
(1) Cun Hui, Yanzhi Zhu:
School of Architecture and Civil Engineering, Zhongyuan Univeristy of Technology, Zhengzhou, China;
(2) Wanlin Cao:
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, China;
(3) Yuanqing Wang:
Department of Civil Engineering, Tsinghua University, Beijing, China.

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