COMPUTING RELIABILITY INDEX OF STRUCTURE BY USE OF LAGRANGE MULTIPLIER METHOD

In this paper, the problem of conditional extreme-value of solving structural reliability index is transformed into the problem of non-conditional extreme-value by use of Lagrange Multiplier Method. It is pointed out that mean values and standard deviations of the effective normal distribution random variables which replace non-normal distribution random variables must have enough accuracy. The results of the examples in this paper show that the speed of convergence and computing accuracy for the method are satisfied.