عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Â Determination of the reliability index is an appropriate criterion for estimation of the failure probability of the structures. Therefore, some methods such as: Hasofe r-Lind and the Gradient method have been developed and commonly used to determine the reliability index of structures. In this paper, a new method is proposed for determination of the reliability index. This new method is based on the nonlinear conjugate gradient method. The algorithm of new method has been presented first and then, efficiency and runtime of the proposed method have been investigated with several examples. Convergence and run-times of the new method have been compared with the old methods for these examples. Although no convergence has been investigated in old methods for some examples, the results have shown good ability and efficiency of the new method for all problems. Also the proposed method has been converged with less number of iterations and run-times for some examples than the other methods.