Q460高强钢焊接箱形压弯构件极限承载力数值分析  

Numerical Analysis of the Ultimate Bearing Capacity of Welded Box-Section Columns Using Q460 High Strength Steel in Bending and Axial Compression

作　　者：闫晓雷[1] 李国强[2] 陈素文[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3期12-18,47,共8页Progress in Steel Building Structures

基　　金：国家自然科学基金(90815029)

摘　　要：为了考察国产Q460高强钢焊接箱形压弯构件的力学性能,以数值积分法和有限单元法对7个已有焊接箱形压弯构件试验进行了数值分析。试件宽厚比分别为8、12、18,长细比分别为35、50、80。介绍的数值模型中考虑了实测的初始挠度、初始偏心及残余应力对构件极限承载力的影响,采用简化的残余应力分布模型、实测残余应力分布与理想弹塑性材料模型、线性强化材料模型相组合,对Q460高强钢焊接箱形压弯构件的极限承载力与荷载-挠度曲线进行了数值计算。为了验证数值分析的准确性,将预测结果与已有试验结果进行了对比,分析结果表明:采用相同模型的数值积分法分析结果与有限元分析结果吻合良好;采用理想弹塑性材料模型的计算结果优于采用线性强化材料模型。通过对比采用简化残余应力分布模型与采用实测残余应力分布模型的有限元分析结果,验证了简化残余应力分布模型的准确性。因此,可以利用数值计算方法,采用理想弹塑性材料模型与简化残余应力分布模型进行Q460高强钢压弯构件极限承载力的数值分析,以此作为相对较少的试验数据补充。This paper presents a numerical analysis of the ultimate bearing capacity of Q460 high strength steel columns in bending and axial compression.Numerical analysis was performed with both numerical integration method (NIM) and finite element method (FEM).The numerical models are based on the previous experiments conducted by authors.The measured initial geometric imperfections and simplified distributions of residual stresses are taken into account in the numerical models.The predicted results obtained through NIM and FEM show a good agreement with each other.The comparison of test results with numerical results was presented for verifying the NIM program.It is demonstrated that both NIM and FEM,which take initial imperfections into account,could predict reliable results on the behavior of Q460 high strength steel welded box columns under bending and axial compression.Moreover,the accuracy of the simplified distributions of residual stresses was verified by comparing the FEM results considering measured distributions with FEM results considering simplified distributions.The results predicted by numerical analysis fit well with those obtained from the tests,which validates the numerical analysis models are suitable for further parameter studies.

关 键 词：高强钢 焊接箱形截面 压弯构件 极限承载力 数值积分法 有限元分析 

分 类 号：TU391[建筑科学—结构工程] TU312