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荷载随机过程具有明显的相关性,但在现有研究中被假设为独立无相关的过程,这会导致分析结果不准确。该文基于Monte Carlo数值模拟的方法讨论了荷载过程相关性对结构时变可靠度的影响。模拟中,荷载事件的随机性通过Poisson过程进行描述,其大小服从正态分布;荷载相关性在时间域上的变化用指数衰减模型描述。为了克服荷载相关性模拟的困难,该文给出了简化的荷载过程模拟方法。该方法仅涉及简单的代数运算,应用简便,结果准确。研究发现:若不考虑荷载过程相关性,会低估结构的可靠度;并且,荷载过程相关性越大,低估的效果越明显。
Stochastic processes with load are obviously correlated, but in the current study, they were assumed to be independent and irrelevant processes, which would result in inaccurate results. Based on Monte Carlo numerical simulation, the paper discusses the influence of load correlation on the time-dependent reliability of structures. In the simulation, the randomness of load events is described by Poisson process, whose size follows a normal distribution. The change of load correlation in time domain is described by exponential decay model. In order to overcome the difficulties of load correlation simulation, this paper gives a simplified simulation of load process. The method involves only simple algebraic operations, the application is simple and the result is accurate. The study found that if the correlation of load process is not considered, the reliability of the structure will be underestimated. And the greater the correlation of load process, the more obvious the effect of underestimation.