火灾下考虑震损的方垫板加强T型节点抗火性能

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (5): 130-137.

火灾下考虑震损的方垫板加强T型节点抗火性能

许继祥^*, 杨龙龙, 韩建平, 仝义鸽

兰州理工大学土木工程学院, 甘肃兰州 730050

收稿日期:2019-03-15 出版日期:2021-10-28 发布日期:2021-11-18
通讯作者: 许继祥(1979-),男,甘肃陇西人,博士,副教授.Email:xujixiangx@163.com
基金资助:
国家自然科学基金(51668040),中国博士后科学基金(2015M572664XB)

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

XU Ji-xiang, YANG Long-long, HAN Jian-ping, TONG Yi-ge

College of Civil Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2019-03-15 Online:2021-10-28 Published:2021-11-18

摘要/Abstract

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.

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

Abstract: 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 asdiameter 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.

Key words: post-earthquake fire, tubular T-joint, square doubler plate, damage variable, fire resistance, critical temperature

中图分类号:

TU391

许继祥, 杨龙龙, 韩建平, 仝义鸽. 火灾下考虑震损的方垫板加强T型节点抗火性能[J]. 兰州理工大学学报, 2021, 47(5): 130-137.

XU Ji-xiang, YANG Long-long, HAN Jian-ping, TONG Yi-ge. Fire resistance behavior of earthquake-damaged tubular T-joint reinforced with square doubler plate under fire[J]. Journal of Lanzhou University of Technology, 2021, 47(5): 130-137.

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