混凝土电杆加固结构焊接残余应力的有限元分析

Finite Element Analysis of Welding Residual Stress of Concrete Pole Reinforcement Structure

依据热弹塑性理论,建立了混凝土电杆Q235钢加固结构对接接头的三维数值分析模型,利用ANSYS有限元软件对混凝土电杆Q235钢加固结构焊接残余应力场进行了模拟计算,并分析了其应力分布特征。结果表明:焊缝及附近区域产生应力集中;相较于横截面的x、y方向应力,z向(焊接方向)的残余应力峰值较大,其拉应力峰值高于屈服强度。焊缝中心内外表面残余应力沿平行于焊缝方向的分布均为起弧端和熄弧端位置波动比较明显,中间部分变化平缓,且外表面的z向等效应力较大,达到材料屈服强度,内表面应力均较小。

Based on thermal-elastic-plastic theory, a three dimensional numerical analysis model of butt welding joint of Q235 steel concrete pole reinforcement structure was established. The welding residual stress field of the Q235 steel concrete pole reinforcement structure was calculated by using ANSYS finite element software and its distribution was analyzed. The results show that, stress concentration is generated in the weld and near the weld. Compared with those in x and y directions of the cross section, the residual stress peak in z direction(welding direction) is bigger, and the peak tensile stress in z direction is higher than the yield trength of the base metal. The distribution of residual stress of the inner and outer surface of the weld center along the direction parallel to the weld is obviously fluctuating at the starting and extinguishing ends, and the change of the middle part is gentle, and the z-direction equivalent stress on the outer surface is larger, which reaches the yield strength of the material. The stress on the inner surface is smaller.