As the limit state equation of concrete dam is highly nonlinear and can t be expressed in an explicit form,the adaptive importance sampling method is suggested in this paper.

• 在大坝可靠度计算中,其功能函数具有高度非线性和无法显式表达的特性,解决此类问题的常用方法有响应面法、蒙特卡罗法、重要抽样法等。