火灾下考虑震损的方垫板加强T型节点抗火性能  

Fire resistance behavior of earthquake-damaged tubular T-joint reinforced with square doubler plate under fire

作　　者：许继祥[1] 杨龙龙 韩建平[1] 仝义鸽 XU Ji-xiang;YANG Long-long;HAN Jian-ping;TONG Yi-ge(College of Civil Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2021年第5期130-137,共8页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51668040);中国博士后科学基金(2015M572664XB)。

摘　　要：利用已有试验验证方垫板加强T型节点数值分析模型,引入损伤变量,考虑参数直径比、径厚比、壁厚比、垫板长度与支管直径比及垫板厚度与主管厚度比,对震后火灾作用下方垫板加强T型节点抗火性能进行分析研究.结果表明:损伤变量对方垫板加强T型节点的临界温度影响较大,临界温度随着损伤变量的增大呈线性减小趋势;直径比、径厚比、壁厚比及垫板厚度与主管厚度比对方垫板加强T型节点的临界温度影响较小;垫板长度与支管直径比对方垫板加强T型节点的临界温度影响较大,且随着该比值的增大方垫板加强T型节点的临界温度减小;径厚比和壁厚比的增大会使方垫板加强T型节点临界温度发生小幅度的上升.Based on the numerical analysis model of tubular T-joint reinforced with square doubler plate verified by existing experimental tests,by introducing damage variable and considering the parameters,such as diameter ratio,diameter-to-thickness ratio,wall thickness ratio,doubler plate length-to-brace diameter and doubler plate thickness-to-chord thickness,fire resistance of tubular T-joint reinforced with square doubler plate was analyzed under post-earthquake fire.The results show that the critical temperature of tubular T-joint reinforced with square doubler plate is affected by the damage variable,and the critical temperature decreases linearly with the increase of the damage variable;diameter ratio,diameter-to-thickness ratio,wall thickness ratio and doubler plate thickness-to-chord have little influence on the critical temperature of the tubular T-joint reinforced with square doubler plate;doubler plate length-to-brace diameter has a great influence on the critical temperature of the tubular T-joint reinforced with square doubler plate,and the critical temperature of the tubular T-joint reinforced with square doubler plate decreases with the increase of this ratio.

关 键 词：震后火灾 T型节点 方垫板 损伤变量 耐火性能 临界温度 

分 类 号：TU391[建筑科学—结构工程]