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基于试验研究(第1部分)给出的试验结果,使用ECBL(临界分叉荷载侵蚀)方法,对均匀压缩作用下穿孔和未穿孔截面耦合点处的初始缺陷对临界分叉荷载侵蚀的影响进行了数值分析。为确定显著性初始缺陷,进行了数值敏感性分析。将考虑试件显著初始缺陷的“理论”抗压能力与试验结果进行了对比。采用标准有限元(FE)模型和ECBL方法确定截面的屈曲曲线。最后,给出了同类型截面屈曲曲线的数值计算方法。
Based on the experimental results given in the experimental study (Part 1), the effects of initial defects at the coupling points of perforation and non-perforated cross-section under uniform compression on the critical furcation load erosion were studied using the ECBL (Critical Breaking Load Erosion) method Numerical analysis. To determine the significant initial defect, a numerical sensitivity analysis was performed. The “theoretical” compressive capacity considering the significant initial defect of the specimen is compared with the experimental results. Buckling curves of sections were determined using standard finite element (FE) models and ECBL methods. Finally, the numerical calculation method of the same type of section buckling curve is given.