多个设计点安全边界方程的重要抽样函数

AN IMPORTANCE SAMPLING FUNCTION FOR COMPUTING FAILURE PROBABILITY OF A LIMIT STATE EQUATION WITH MULTIPLE DESIGN POINTS

提出了一种新的适用于具有多个设计点的安全边界方程失效概率计算的重要抽样函数，其抽样估计值的方差小于现有方法，收敛速度也较现有方法快，抽样效率为５０％左右，且估计值收敛于真实值。

A new importane sapling function for computing failure probability f a limit state equation with multiple design points is presented. The efficiency, accuracy and versatility of this method are addressed.