楔形体边坡的系统可靠度分析  

Reliability Analysis of Wedge Slopes

作　　者：谭晓慧[1] 宋传中[1] 侯晓亮[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009

出　　处：《土木建筑与环境工程》2013年第S1期90-95,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：中国博士后科学基金资助项目(2011M501039);国家自然科学基金资助项目(40972194);合肥工业大学博士后资助项目

摘　　要：楔形体边坡工程中存在着材料及几何参数的不确定性,而且具有多种失稳模式,需要进行楔形边坡的系统可靠度分析。视楔形体边坡为4个失稳模式组成的串联系统,再将每个失稳模式视为由3个元件组成的并联子系统,由系统可靠度分析的条件余量法及界限法进行了楔形体边坡稳定的可靠度分析。在进行并联子系统的可靠度分析时,提出了对非线性功能函数进行线性化的改进方法。计算表明:将楔形体边坡视为串并联系统进行可靠度分析是可行的;本文的线性化方法能够较准确地模拟原失效域,具有较高的计算精度;可靠度分析与定值法分析得到的边坡最可能失稳模式不一致;进行边坡的设计及治理时应进行边坡的可靠度分析。The material parameters and geometric parameters of wedge slopes have high variability,and there are several failure modes for a wedge slope.It is necessary to carry out system reliability analysis for wedge slopes.We consider a wedge slope as a series system which is composed of four failure modes,and we consider each failure mode as a parallel sub-system with three components.Then,the reliability analysis is carried out by using the product of conditional marginal method and bound method of system reliability analysis.A new method for the linearization of nonlinear performance function is proposed for computing the coefficient of correlation between each failure modes in the parallel sub-system.Through the reliability analysis of a wedge slope,it is illustrated that a wedge slope can be considered as a series-parallel system,and the new linearization method can simulate the failure domain accurately.The failure modes computed from the reliability analysis and the deterministic method is different.Reliability analysis method is suitable for the design and management of wedge slopes.

关 键 词：系统分析 可靠度分析 楔形体边坡 并联系统 串联系统 可靠指标 失效概率 

分 类 号：TU311.2[建筑科学—结构工程]