FAILURE MODE AND CRITICAL TEMPERATURE OF TUBULAR Y-JOINTS UNDER FIRE CONDITION

摘要：

　　The fire resistance of tubular Y-joints is investigated by using finite element software ABAQUS.Compared with the existing experimental results,the finite element method is verified to simulate tubular Y-joints properly under fire condition.According to numerical analysis,tubular Y-joints always fail at the intersection between the chord and the brace.The failure mode is influenced by geometrical parameters and load ratio of the joint.The critical temperature and the fire resistance limit time are also studied for the joint under fire condition.Parametric study is then conducted.The effect of geometrical parameters θ,β and γ,as well as load ratio n,on the fire resistance of tubular Y-joints is investigated.The fire resistance of the joint significantly reduces with the increase of the load ratio.In the condition of the same load ratio,the bigger β is,the better the performance of fire resistance is.When the load ratio is small,the bigger θ is,the better the performance of fire resistance is.However,the effect on fire resistance of the joint decreases as the load ratio increases.γ almost has no effect on the fire resistance of the joint.Chord axial reaction caused by expansion of steel material is greatly bigger than that caused by applied load and seriously affects the fire resistance of tubular Y-joints.It becomes smaller with the increase of load ratio.

关键词： Fire resistance tubular Y-joints finite element analysis failure mode critical temperature

作者: Fei Gao Shaobo Chu Miao Zhang Enxu Lu Xingquan Guan Zhigao Wu

作者单位: School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, P.R.China;Hubei Key Laboratory of Control Structure, Huazhong University of Science and Technology, Wuhan 430074, P.R.China

会议类型: 国际会议

会议名称: The Twelfth International Symposium on Structural Engineering (第十二届结构工程国际研讨会)

会议地点: 武汉

会议语种:英文

页码: 713-719

在线出版日期: 2012-11-17（万方平台首次上网日期，不代表论文的发表时间）