厚板焊接柱残余应力的有限元分析

厚板焊接柱极限承载力研究的关键是焊接残余应力的确定.本文应用热弹塑性应力分析理论,有限元法计算了厚板焊接箱形截面的残余应力分布.结果表明:由于三维残余应力的影响,厚板焊接箱形截面中纵向残余拉应力的峰值略高于钢材的屈服点,残余压应力分布区的大小及压应力峰值不仅与焊接输入热量有关,而且与截面积的大小有直接关系.受厚板截面本身的几何形状所影响,箱形截面有焊缝一侧壁板与另一侧壁板残余应力分布及大小有明显的不同.两个1/4箱形截面的焊接残余应力实测基本上验证了理论分析.

A FINITE ELEMENT ANALYSIS OF RESIDUAL STRESS INDUCED IN HEAVY PLATE WELDED COLUMN

For analysing the collapse load of heavy plate welded steel column, it is important to obtain the residual stress distribution in the cross section of the column. Using the theory of thermal elastic梡lastic stress analysis, this paper calculates the residual stress distribution in the heavy plate welded box-section by finite element method.The studing results indicate that the maximum tensile residual stress in the box-section is slightly higher than the yield strength of the parent metal due to the influence of three-dimensional residual stresses. The magnitude and distribution of compressive residual stress are relate to the heat input created by welding process and the cross section geometry. Affected by the geometry of box-section, the residual stress distribution of plate with welding passes is different from that of another plate. Residual stress measurement is made by the sectioning method, the agreement between the calculated and tested results gives confirmation to the analytical method.