考虑震损的法兰板加强型梁柱边节点抗火性能  

Fire resistance of flange plate plate-strengthened beam-column joints considering seismic damage

作　　者：许继祥[1] 甘晓书 姜旺 XU Ji-xiang;GAN Xiao-shu;JIANG Wang(School of Civil Engineering,Lanzhou University of Technology,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》2025年第1期129-137,共9页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51668040)。

摘　　要：为研究地震后法兰板加强梁翼缘型梁柱边节点的耐火性能,利用有限元软件ANSYS建立计算模型,将计算结果与已有试验结果进行对比验证计算模型的准确性和有效性.利用PUSHOVER方法,引入损伤变量D模拟不同地震等级下的震损.通过重启动分析法,将地震作用产生的残余应力和残余变形全部传递给各个节点的升温加载中,并对不同参数和不同损伤变量下法兰板加强梁翼缘型梁柱边节点的耐火性能、极限位移和失效机理进行深入分析.结果表明:损伤变量对法兰板加强梁翼缘型梁柱边节点的耐火性能起着主要影响作用,随着损伤变量D的增加,各节点的临界温度大幅度降低.参数α和γ的增加均能提高法兰板加强梁翼缘型梁柱边节点的耐火性能.法兰板加强梁翼缘型梁柱边节点的耐火性能随着参数β的增加而降低.In order to study the fire resistance performance of the flange plate strengthened beam-column joints with flange-reinforced plate after an earthquake,this paper used the finite element software ANSYS was utilized to establish the computational calculation model,and the calculation results were compared with the existing test results to verify the accuracy and efficacy effectiveness of the calculation model.The pushover method was employedused to simulate the seismic damage under different earthquake levels by introducing damage variables D.The residual stress and deformation caused by earthquake were transferred to the heating process by restart analysis method.The fire resistance,ultimate displacement and failure mechanism of flange beam-column joints with flange flange-strengthened beams under different parameters and damage variables were analyzed.The results showed that the damage variable had a major effect on the fire resistance of flange plate plate-strengthened beam-column joints.With the increase of damage variable D,the critical temperature of each connection was decreased greatly.Increasing the parameter α and γ can enhance the fire resistance of flange plate strengthened beam-column joints.While the increase of the β can impair the fire resistance of flange plate plate-strengthened beam-column joints.

关 键 词：震后火灾 法兰板加强梁翼缘 梁柱边节点 损伤变量 耐火性能 

分 类 号：TU391[建筑科学—结构工程]