Q460高强钢焊接箱形柱轴心受压力学性能数值分析

NUMERICAL ANALYSIS OF MECHANICAL PROPERTY OF Q460 HIGH STRENGTH STEEL WELDED BOX COLUMNS UNDER AXIAL COMPRESSION

为了解国产Q460高强钢焊接箱形柱轴心受压的力学性能,以数值积分法和有限单元法对7个已有焊接箱形柱轴心受压试验进行数值分析。试件宽厚比为8～12,长细比为35～70。数值模型中考虑了实测的初始挠度、初始偏心及简化的残余应力分布模型。分析预测Q460高强钢焊接箱形柱轴心受压的极限承载力和荷载-挠度曲线。数值积分法分析结果与有限元分析结果吻合。为验证数值分析的准确性,将预测结果与已有试验结果进行对比发现,考虑残余应力、初始偏心、初始挠度的数值积分法与有限元分析可以准确地预测Q460钢焊接箱形柱受压力学行为。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,验证简化残余应力分布模型的准确性。

In order to investigate the behavior of Q460 high strength steel welded box columns under axial compression,numerical analysis was performed with both numerical integration method（NIM）and finite element method（FEM）.The numerical models were based on the previous experiments conducted by authors.The measured initial geometric imperfections and simplified distributions of residual stresses were taken into account in the numerical models.The predicted results obtained through NIM and FEM showed a good agreement with each other.The comparison of test results with numerical results was presented for verifying the NIM program.It was demonstrated that both NIM and FEM,which took initial imperfections into account,could predict reliable results of the behavior of Q460 high strength steel welded box columns under 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.