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考虑初始缺陷对翼缘弹塑性屈曲荷载的影响,设计了3组翼缘宽厚比不同的试件,对其进行承载力试验。结果表明:翼缘的初始缺陷显著降低了波纹腹板梁翼缘的弹塑性屈曲荷载。将3组试件极限荷载的有限元分析结果与试验结果进行对比。有限元分析结果表明,满足弹性设计公式的试件分别考虑翼缘初始几何缺陷、残余应力将降低弹塑性屈曲应力,降幅约28%、14%。综合试验及有限元分析结果,考虑初始几何缺陷、残余应力对翼缘弹塑性屈曲应力的影响,对弹性设计公式中的弹性模量取折减系数0.62,得到可供工程设计参考的翼缘宽厚比限值计算式,并给出了该计算式的适用范围,认为波纹腹板梁翼缘钢板的局部平面度偏差限值可放宽至2 mm。
Considering the effect of initial defects on the elastic-plastic buckling loads of the flanges, three specimens with different flange width-thickness ratios were designed and their bearing capacity tests were carried out. The results show that the initial flaw of the flange significantly reduces the elastic-plastic buckling load of the flange of the corrugated web beam. The results of finite element analysis of the ultimate load of three groups of specimens were compared with the test results. The results of finite element analysis show that the residual stress will reduce the elastic-plastic buckling stress by about 28% and 14% respectively, considering the initial geometrical defects of the flange considering the elastic design formulas. According to the results of the comprehensive test and the finite element analysis, considering the influence of the initial geometric defects and residual stress on the elastic-plastic buckling stress of the flange, taking the modulus of elasticity of the elastic design formula as the deduction coefficient of 0.62, The formula of ratio is given and the applicable scope of this formula is given. The limit of partial flatness deviation of flange plate of corrugated web beam can be relaxed to 2 mm.