中文摘要：

对典型焊接方法下的厚钢板构件焊接性能进行实验和数值模拟研究.首先采用磁弹仪获得MP-σ标定曲线,通过磁弹性法测量得到厚钢板焊接接头残余应力;然后基于ABAQUS及其子程序DFLUX,模拟了厚钢板对接焊接全过程.对比数值模拟和实验结果表明：构件焊接接头纵向应力大于横向应力;沿Y轴的纵向焊接残余应力随着板厚度的增加而增加,厚度小于60mm焊件增加尤为明显.此外,本文耦合了焊接过程中的温度场、应力场,并考虑了积累损伤的影响,完成了焊接构件在低周往复荷载作用下的计算分析,结果表明,在低周往复荷载作用下焊接构件中的残余应力对累积损伤分布有较大影响.

英文摘要：

This paper focused on numerical and experimental research on mechanical behavior of thick steel plate members.Firstly,the magneto-elastic equipment was used to obtain the MP-σcurve,and the residual stress of thick plate welded joints was measured by using magneto-elastic method.Secondly,based on the ABAQUS finite element code and subroutine DFLUX,the welding procedure on the butt weld of thick steel plates was simulated.The numerical and experimental results show that：1）the welding longitudinal residual stress is bigger than the transverse residual stress as a whole;2）the welding longitudinal residual stress along Yaxis increases with the increase of plate thickness,especially when the thickness is less than 60 mm.Moreover,coupling temperature field and stress field,and also considering damage accumulation,weld thick plate members under low-cycle loading were analyzed.The result shows that welding residual stress has a big influence on the distribution of accumulative damage under low-cycle loading.