通过极限状态的局部近似对失效概率的评估

• 作 者: C.Proppe
• 出 处: 钢结构
• 发表日期: 2004年期
• 关键词: 极限状态 失效概率 移动最小二乘法 反应面法 重要性抽样 超曲面 大型结构 预测方法 计算方法 系统失效

对大型结构系统失效的可能性预测方法中,基于极限功能的数值评估将被适应性近似方法所取代。到目前为止,文献中所列出的大部分方法可以对超曲面的失效作出整体近似。本文基于移动最小二乘法提出的一个计算方法,主要针对极限状态进行适应性局部近似,而不是用于超曲面失效问题的计算。它与现有方法能很好地结合,并且能对失效概率作出有效评估。

In the prediction of the possibility of failure of large structural systems, the numerical evaluation based on the limit function will be replaced by the adaptive approximation method. So far, most of the methods listed in the literature can make a global approximation to the failure of a hypersurface. In this paper, a calculation method based on moving least square method is proposed, which is mainly for adaptive local approximation of limit state, rather than for the calculation of hypersurface failure. It is well integrated with existing methods and can effectively assess the probability of failure.