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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。
In order to investigate the axial compressive mechanical properties of domestic welded H-shaped columns of Q460 high-strength steel, the axial compressive tests of six existing welded H-shaped columns were carried out. Numerical analysis using the author’s numerical integration method of computer programs and general finite element software ANSYS. Considering the measured initial deflection, initial eccentricity and simplified numerical model of residual stress distribution, the ultimate bearing capacity and load-deflection curve of Q460 high-strength steel welded H-column were calculated. It is found that the numerical integration method and the finite element method calculate the load-deflection curves of the specimens basically coincide. In order to verify the accuracy of the numerical model, the results of numerical analysis are compared with those of the existing tests. The simplified residual test is simplified by comparing the residual stress distribution model with the measured residual stress distribution on the ultimate bearing capacity and load-deflection curves Accuracy of stress distribution model. The results show that both the numerical integration method and the finite element method which take into account the initial geometric defects and the simplified residual stress model can predict the compressive behavior of welded H-shaped columns of Q460 steel more accurately. The simplified residual stress model is used to predict the ultimate bearing capacity of welded H-shaped columns of Q460 steel to be more conservative than the measured residual stress distribution.