Journal of South China University of Technology (Natural Science Edition) ›› 2015, Vol. 43 ›› Issue (7): 33-41.doi: 10.3969/j.issn.1000-565X.2015.07.006

• Architecture & Civil Engineering • Previous Articles     Next Articles

Seismic Behavior of Exterior Through －Beam Joint Between Concrete-Filled Steel Tubular Columns and Reinforced Concrete Beams

Chen Qing-jun1,2 Xue Hua1 Tang Xu-lin1 Zuo Zhi-liang1,2 Chen Ying-rui1   

  1. 1.School of Civil and Transportation Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. State Key Laboratory of Subtropical Building Science, Guangzhou 510640, Guangdong, China
  • Received:2014-12-02 Revised:2015-01-12 Online:2015-07-25 Published:2015-06-03
  • Contact: 汤序霖( 1986-) ，男，博士后，主要从事结构工程等研究． E-mail:ctxulintang@scut.edu.cn
  • About author:陈庆军( 1975-) ，男，副教授，主要从事结构理论、结构仿真分析等研究． E-mail: qjchen@scut.edu.cn
  • Supported by:
    Supported by the Youth Foundation of the National Natural Science Fundation of China ( 51408230) and the Natural Science Foundation of Guangdong Province of China ( S2013040015140)

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Abstract:

The low-cycle reversed loading experiments of four specimens were conducted to investigate the seismic behavior of the exterior through-beam joint between concrete-filled steel tubular (CFST) columns and reinforced concrete beams. Experimental results show that (1) as the relative reinforcement ratio ( the reinforcement ratio of ring beam / the reinforcement ratio of frame beam) and the relative radio width ratio ( the width of ring beam / the diameter of steel tube) decrease, the plastic hinge transfers from the frame beam to the ring beam, and three failure modes occur, which includes the failure at the frame beam root, the failure at the connection of the frame beam and the ring beam and the failure in the ring beam; (2) the internal force at the roots of the beams can be reliably transmitted to the joint, and the joint can work coordinately with the frame beam and the CFST column; and (3) for the specimens designed on the basis of the principle of“Strong Joint”, the plastic hinge appears at the frame beam root with plump hysteretic curves, relatively large ductility coefficient, concave and convergent stiffness curves and excellent energy dissipation ability, which means that the seismic behavior is good. Therefore, the exterior through-beam joint obtained through reasonable design is safe and reliable under stress, and it can realize the anti-seismic design principle of“Strong Column with Weak Beam is, Stronger in Joints”.

Key words: concrete-filled steel tubular, exterior joint, through-beam joint, seismic behavior