基于有限元响应面法的重力坝抗拉可靠度分析

采用有限元方法计算坝体内的应力,以可能的拉应力范围作为作用效应,容许的拉应力范围作为抗力,建立了与重力坝设计规范中有限元分析结果相对应的抗拉极限状态方程.由于此极限状态方程为隐式,故采用一阶响应面法求解可靠度,并运用正交试验设计方法减少有限元分析次数.本文以龙滩碾压混凝土重力坝为例,给出了实例计算分析结果.

Tensile reliability analysis of gravity dams by FEM response surface method

In the paper, the FEM is used to obtain the dam stress, and the limit state equation of tensile reliability for gravity dams is established with the possible tensile stress distribution width being set as action effect and the allowable tensile stress distribution width being set as resistance. This limit state is implicit. The linear response surface method is applied and the orthogonal test design method is used to reduce the number of finite element analysis. The Longtan RCC gravity dam is taken as an example and the analysis results are also given.