区间可靠性分析方法及在地下隧道结构计算中的应用

基于工程结构不确定性的区间分析方法,本文将区间分析方法与可靠性分析方法相结合,探讨了一种可以获得区问可靠指标的可靠性分析方法.依据结构失效准则确定的功能函数在一定区间内变化,进而得出了可靠指标的变化区间,在得到区间可靠指标的同时也得到了一种反映结构稳健性的稳健可靠指标.结合区间有限元的优化计算方法,对某地下隧道结构进行了区间可靠性分析,所得区间可靠性指标合乎规律.

Interval reliability analysis method and its application to underground tunnel structure

Based on the interval analysis method of the uncertainty problems for engineering structures.In this paper,a new reliability analysis method for interval reliability index is gained by combining interval analysis method and reliability analysis method.The performance functions that are defined by the failure criteria of structures change in some certain intervals,so the reliability indexes change in some certain intervals.The robust reliability indexes are gained during computing interval reliability indexes.By combining interval finite element optimization computation method,the underground tunnel is analyzed by using interval reliability analysis method.The outputs indicate the tunnel is safe and reliable under given boundary water load interval and parameter intervals.The reliability indexes of top and bottom elements of tunnel structure are low,and the reliability indexes of mid elements of tunnel structure are high.That accords with the general rules.