To solve such problems as inaccurate results and sensitivity to model parameters in structural reliability evaluation based on random load and strength degradation,a modeling method based on random distribution characteristics was proposed.The distribution characteristics of random load were considered,and the load-strength model and stochastic process theory were used to improve the accuracy of reliability calculation.Taking the counting model of random load as the Poisson process for example,the distribution characteristics of random load arrival time were analyzed and proved.Based on this,the reliability formula of the first load was derived,and the calculation formula of structural reliability was derived theoretically according to the total probability formula.An example analysis showed that the proposed method is consistent with Monte Carlo simulation results,which verifies the correctness of the proposed method and improves the accuracy of reliability calculation compared with the other methods.
structural reliabilityrandom distributiondegraded structureload-strength modelMonte Carlo
NETL
NSTL
万方数据
