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电除尘器是用于消除大气烟尘的重要环保设备,壳体是其中最重要的工艺部分。壳体墙板为加劲钢板,与立柱连续焊接连接,组成共同承载的结构体系。壳体承受的横向荷载为负压与风荷载,作用在墙板上,壳体承受的竖向荷载主要作用在立柱上。墙板的初始缺陷会影响立柱的承载能力。该文通过非线性有限元方法,研究不同缺陷幅值时,完善结构极值点变形缺陷模态、完善结构非线性分岔点变形缺陷模态、特征值屈曲缺陷模态、墙板正弦波形缺陷模态以及墙板安装过程中的焊接收缩残余变形与残余应力对立柱承载力的影响。当缺陷幅值一定时,各种初始几何缺陷形式中,以完善结构的极值点变形缺陷模态为最不利。墙板安装过程中的焊接收缩引起的残余应力对于立柱承载是有利的,但是提高承载力很小。随着焊接收缩量的增大,残余应力值增大,同时考虑残余应力和残余变形影响得到的立柱承载力比仅考虑残余变形得到的承载力的增加量变大。
ESP is an important environmental protection equipment used to eliminate atmospheric smoke and dust, the shell is one of the most important part of the process. Shell wall panels for the stiffened plate, and the column continuous welding connection, composed of co-bearing structural system. The lateral load that the shell endures is the negative pressure and wind load, act on the wall board, the vertical load that the shell endures mainly acts on the column. The initial defects of the wallboard will affect the carrying capacity of the column. In this paper, by means of nonlinear finite element method, when the amplitude of different defects is studied, the modes of deformation and extremum deformation at the extremum point of structure are improved, the mode of deformation and deformation of nonlinear bifurcation point, the mode of buckling of eigenvalue buckling, Modal and the influence of residual shrinkage and residual shrinkage on the bearing capacity of column during the process of wallboard installation. When the defect amplitude is constant, the deformation mode of the extreme points in the perfect structure is the most unfavorable among the various forms of initial geometric defects. Residual stresses caused by weld shrinkage during wallboard installation are beneficial for column loading, but increase bearing capacity is small. As the amount of welding shrinkage increases, the residual stress increases, and the bearing capacity of the column obtained by considering the residual stress and residual deformation becomes larger than the increase of the bearing capacity obtained by considering only the residual deformation.