【摘要】 考虑到地震动的随机性对结构响应造成的变异性以及不同截面损伤模型对结构失效的影响,有必要对不同地震动作用下结构的失效模式进行统计分析.以一个钢筋混凝土平面框架为例,采用三种截面损伤模型来研究结构在不同地震动作用下的失效模式,基于加权秩和比的统计方法得出新的失效模式,通过定义相似度来描述其与最弱失效模式的差异性.结果表明,截面损伤模型对结构失效模式的影响有限,不同截面损伤模型得到的失效模式大体相近.基于规范设计反应谱,当输入的不同地震动之间的离散性较小时,首个失效截面位置都相同;所提出的失效模式与最弱失效模式有着较大的差异,前者具有统计意义,更便于工程实际应用.更多还原

【Abstract】 With considering the variance of structural response caused by the randomness in ground motions and the effect of different sectional damage models on the structural failure,it is necessary to perform the statistical analysis for the failure modes of structures under the action of different ground motions. Through taking a planar reinforced concrete frame as example,the failure modes of structures under the action of different ground motions were investigated with three sectional damage models. A new failure mode was obtained with the statistical method based on the weighted rank sum ratio. The differences between the new failure mode and the weakest failure mode were described through defining the similarity. The results show that the sectional damage models have limited influence on the failure modes of structures,and the failure modes obtained with different sectional damage models are generally similar. Based on the standard design response spectrum,the position of the first failed section is the same when the discreteness between the different input ground motions is smaller. The proposed failure mode shows significant differences from the weakest failure mode. Moreover,the proposed failure mode exhibits statistical significance,and is more convenient for engineering practice application.更多还原