基于可能失效模式的拱坝安全度评价  

Safety analysis of arch dam based on possible failure modes

作　　者：夏雨[1,2] 张仲卿 赵小莲[2] 黄俊[1] 

机构地区：[1]广西工学院,柳州545006 [2]广西大学,南宁530004

出　　处：《应用力学学报》2011年第3期313-317,330,共5页Chinese Journal of Applied Mechanics

基　　金：广西工学院博士科研基金(11Z02);广西科学基金(桂科0991063);中国博士后基金(20080440813)

摘　　要：复杂结构的安全度取决于主要失效模式,但现有的拱坝安全度评价方法较少考虑失效模式。本文基于非概率理论的结构体系安全度评价方法,考虑坝体初始开裂位置的随机性,由非概率可靠度指标最小来搜索拱坝所有可能的失效模式。分别对各种失效模式利用给出的结构体系安全度评价方法进行计算,最小值即为拱坝的非概率可靠度。算例综合考虑拱坝的各种可能失效模式,得到整个拱坝的非概率可靠指标为1.84,更全面合理地给出拱坝的安全度。The safety of complex structures depends on the main failure mode.Up to the present,the safety analysis of arch dam seldom consider failure mode.A new method to analyze the safety of dam by applying theories of non-probability and the convex set model is developed.By considering randomness of dam＇s initial cracking position and the idea that element of the smallest reliability index will fail firstly and then the next smallest,it may find probable failure modes of dam,then calculates reliability index of each mode using the given method,the minimum one is the reliability index of the dam.The analysis considers all possible failure modes,which can offer more reasonable and scientific results.

关 键 词：凸集模型 非概率 结构可靠性 拱坝 安全度评价 

分 类 号：TV642.4[水利工程—水利水电工程]