1.前言在焊接杆件中,杆件截面内存在的残余应力和初始变形,致使压屈荷重降低。在公路桥规范里,是假定杆件有初始变形及截面内存在有残余应力,而定出轴向压应力和梁的受压翼缘的容许应力值。 1. Introduction In the welding rod, the residual stress and initial deformation in the cross-section of the rod lead to the reduction of buckling load. In the highway bridge code, it is assumed that the rod has initial deformation and there is a residual stress in the cross section, and the axial compressive stress and the allowable stress value of the flange of the beam are determined.