Journal of South China University of Technology (Natural Science Edition) ›› 2017, Vol. 45 ›› Issue (12): 135-142.doi: 10.3969/j.issn.1000-565X.2017.12.020

• Architecture & Civil Engineering • Previous Articles     Next Articles

Influence of Connection Behavior on Anti-Collapse Performance of Composite Frames

GAO Shan1,2 GUO Lan-hui3 ZHANG Su-mei3   

  1. 1.Postdoctoral Station of Civil Engineering,Chongqing University,Chongqing 400045,China; 2.Shaanxi Key Laboratory of Safety and Durability of Concrete Structures,Xijing University,Xi'an 710123,Shaanxi，China; 3.School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,Heilongjiang,China
  • Received:2016-12-14 Revised:2017-02-28 Online:2017-12-25 Published:2017-10-31
  • Contact: 高山(1985-)，男，博士，副教授，主要从事钢与组合结构抗连续倒塌性能研究． E-mail:gaoshan@hit.edu.cn
  • About author:高山(1985-)，男，博士，副教授，主要从事钢与组合结构抗连续倒塌性能研究．
  • Supported by:
    Supported by the National Natural Science Foundation of China(51408106)，the National Key Ｒ＆D Program of China (2016YFC0701203)，China Postdoctoral Science Foundation (2017M622965) and Chongqing Postdoctoral Special Foundation (Xm2017095)

PDF

337

Abstract: The beam-column connection plays a key role in the redistribution of internal force,and its behavior has a significant influence on the performance of structures in resisting progressive collapse.In this paper,a finite ele- ment model is constructed for a three-storey steel-concrete composite frame,and the influence of the connection stiffness and strength on the anti-collapse behavior of the composite frame is analyzed by means of the dynamic-col- umn-removal method.The results show that (1) the influence of the connection stiffness and strength on the com- posite effect between the floors in a side span is greater than that on the catenary action in inner spans; (2) the development of the axial force in the beams depends on the connection stiffness,rather than the connection strength; (3) the change of the connection behavior has no influence on the load-carrying independence of each floor; and (4) the improvement in the connection behavior can reduce the demand for the boundary restraint con- dition during the redistribution of internal force.

Key words: composite structures, progressive collapse, dynamic analysis, beam-column connection, catenary action