Q460高强钢焊接H形柱轴心受压力学性能数值分析  

Numerical Analysis on Q460High Strength Steel Welded H-Shaped Columns under Axial Compression

作　　者：王彦博[1] 李国强[2] 陈素文[2] 孙飞飞[2] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《建筑钢结构进展》2013年第5期1-7,共7页Progress in Steel Building Structures

基　　金：国家科技支撑计划(2012BAJ13B02)

摘　　要：为了考察国产Q460高强钢焊接H形柱的轴心受压力学性能,对6个已有焊接H形柱的轴心受压试验进行了数值分析。数值分析采用作者编制的数值积分法电算程序和通用有限元软件ANSYS。以考虑了实测初始挠度、初始偏心及简化残余应力分布的数值模型,计算Q460高强钢焊接H形柱轴心受压的极限承载力与荷载-挠度曲线。发现数值积分法与有限单元法所计算试件的荷载-挠度曲线基本重合。为了验证数值模型的准确性,将数值分析结果与已有试验结果进行对比;并通过对比简化残余应力分布模型与实测残余应力分布对试件极限承载力、荷载-挠度曲线的影响,检验简化残余应力分布模型的准确性。结果表明:考虑了初始几何缺陷及简化残余应力模型的数值积分法与有限单元法均可较为准确地预测Q460钢焊接H形柱的受压力学行为。采用简化残余应力模型预测Q460钢焊接H形柱极限承载力较实测残余应力分布偏保守。This paper presents a numerical model for evaluating the behavior of Q460 high strength steel columns under axial compression.The model is based on numerical integration method(NIM),and it accounts for initial geometric imperfections,eccentricity,and residual stresses in the column.In addition,numerical analysis was performed by using commercial finite element software ANSYS,and the predictions obtained from NIM model reasonably agree with finite element analysis results.The numerical model is further validated against the test data on ultimate capacity and loaddeflection relations of the specimens.The analysis results indicate that NIM model and finite element model,both of which account for initial geometric imperfections and residual stresses distribution,are capable of predicting structural response of H-shaped columns made of Q460 high strength steel under axial compression.Compared to the actually measured residual stresses,the utilizing of the simplified residual stress pattern gives a conservative prediction on axial strength capacity of high strength steel column.

关 键 词：高强钢 焊接H形柱 轴心受压 数值积分法 有限元分析 

分 类 号：TU391[建筑科学—结构工程]