ABSTRACT

An experimental programme and nonlinear finite element analysis are carried out to examine the ultimate strength characteristics of stiffened panels with a crack and pits, under uni-axial longitudinal compressive loads. The test results are used to validate the finite element models. A series of nonlinear finite element analysis is performed with the validated models to illustrate the ultimate strength reduction by varying the relative position between crack and pits, length of crack and pit characteristics. The present results are compared with the earlier results with either crack or pits, confirming the complexity of stiffened panel collapse behaviour. Including the effect of the crack and pits on the plate and column slenderness ratio, a formula has been introduced to predict the ultimate strength of the stiffened panel with the average error less than 10%.

摘要

进行了实验程序和非线性有限元分析，以检查带有裂缝和凹坑的加筋板在单轴纵向压缩载荷下的极限强度特性。测试结果用于验证有限元模型。使用经过验证的模型执行一系列非线性有限元分析，以通过改变裂纹和凹坑之间的相对位置、裂纹长度和凹坑特征来说明极限强度降低。目前的结果与早期的裂缝或凹坑结果进行了比较，证实了加筋板倒塌行为的复杂性。包括裂缝和凹坑对板柱长细比的影响，