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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 understand the mechanical properties of the domestic Q460 high-strength steel welded box-shaped column under axial compression, numerical analysis was carried out on the axial compressive tests of seven existing welded box-shaped columns with numerical integration method and finite element method. Specimen aspect ratio of 8 to 12, slenderness ratio of 35 to 70. The numerical model takes into account the measured initial deflection, initial eccentricity and simplified residual stress distribution model. Analysis and Prediction of Ultimate Bearing Capacity and Load - Deflection Curve of Q460 High Strength Steel Welded Box Axle Under Axial Compression. Numerical integration analysis results and the finite element analysis of the results. In order to verify the accuracy of the numerical analysis, the predicted results are compared with the existing experimental results. The numerical integration and finite element analysis of residual stress, initial eccentricity and initial deflection can accurately predict the mechanical properties of Q460 steel welded box columns behavior. By comparing the simplified residual stress distribution model with the finite element analysis results of the measured residual stress distribution model, the accuracy of simplified residual stress distribution model is verified.