Hysteretic behavior of encased CFST column bases |
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| Authors: | KUANG Xiaobo LI Xian LI Jian |
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| Affiliation: | 1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of
Mining and Technology, Xuzhou 221116, China;
2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China;
3. CRRC Construction Engineering Co., Ltd, Beijing 100078,China; |
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| Abstract: | To study the effects of encased depth and wraping types on hysteretic behavior of encased concrete-filled steel tubular (CFST) column bases, four specimens were tested under cyclic loading and simulated by ABAQUS. Experimental and analytical results indicate that specimens with an encased depth of 2.5 times of the diameter of CFST column exhibit higher load-carrying capacity than those with an encased depth of 1.8 times of the diameter of CFST column. However, the ductility and energy dissipation capacity of specimens are reduced with the increase of encased depth. The specimens with surrounding reinforced concrete confined by steel wraps fail with plastic hinging of the CFST columns at the top of surrounding reinforced concrete, and exhibit higher strength but lower ductility when compared with the specimens with unconfined surrounding reinforced concrete. The finite element simulation can predict the test results well. |
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| Keywords: | concrete-filled steel tube encased column base quasi-static test finite element analysis hysterestic behavior |
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