高温下焊接Q960钢H形截面柱局部稳定设计方法  

Local Buckling Design Method of Welded Q960 Steel H-section Column at Elevated Temperatures

作　　者：王卫永[1,2] 杨启波 李翔 WANG Weiyong;YANG Qibo;LI Xiang(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area(Ministry of Education),Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]山地城镇建设与新技术教育部重点实验室(重庆大学),重庆400045

出　　处：《防灾减灾工程学报》2024年第1期183-191,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金(52178110);重庆市自然科学基金杰出青年基金(cstc2021jcyj-jqX0021)资助。

摘　　要：为考察焊接Q960钢H形截面轴心受压柱局部稳定性能,采用ABAQUS软件建立有限元模型,经试验数据验证后,分析翼缘宽厚比、腹板高厚比、构件温度、构件长细比、初始几何缺陷和残余应力等参数对焊接Q960钢H形截面轴心受压柱局部屈曲强度的影响。研究表明,轴心受压柱的局部屈曲承载力主要与截面尺寸及构件温度有关。采用多国规范对试验试件的局部屈曲承载力进行计算,发现现有规范的设计方法不适用于高温下焊接Q960钢H形截面轴心受压柱局部屈曲承载力的计算。根据有限元分析结果提出焊接Q960钢H形截面轴心受压柱局部屈曲设计方法,与试验数据和有限元分析结果的对比表明所提方法能较准确地计算焊接Q960钢H形截面轴心受压柱不同温度下的局部屈曲承载力。In order to study the local stability of Q960 welded H-section axial compression columns,ABAQUS software package is employed to establish the finite element model.After verified by the experimental data,the effects of different parameters,such as flange width to thickness ratio,web height to thickness ratio,member temperature,member slenderness ratio,initial geometric imperfec-tion and residual stress,on the local buckling ultimate strength of Q960 welded H-section axial com-pression columns are analyzed.The results show that the local buckling capacity of axially compressed columns is mainly related to the section dimension and member temperature.It is found that the design method of current codes is not suitable for estimating the local buckling capacity of welded Q960 steel H-section axial compression columns at high temperatures.According to test data and finite element analysis results,a local buckling design method for welded Q960 steel H-section axial compression columns is proposed.The comparison with experimental data and finite element analysis results shows that the proposed method can accurately calculate the local buckling capacity of welded Q960 steel H-section axial compression columns at different temperatures.

关 键 词：局部屈曲 高强Q960钢 有限元分析 设计方法 

分 类 号：TU391[建筑科学—结构工程]