验证荷载法的推广及其验证效率分析

Extension of proof load method and analysis of its proof efficiency

介绍了验证荷载法的基本原理,讨论了验证荷载法有效性的根本判别原则。通过在二维标准正态随机空间中对确定性验证荷载效应的考察,分析了验证荷载法能够对结构可靠度产生影响的实质。根据数值计算结果结合理论分析,探讨了确定性验证荷载效应的影响因素及其变化规律,从而得出了验证荷载法的适用范围,并给出了一般情况下能够对结构可靠度评估结果产生有效影响的确定性验证荷载水平的下限值。在确定性验证荷载法基础上,通过分析,将验证荷载法予以推广,给出了广义验证荷载法的一般性定义,并通过在三维标准正态随机空间内对随机性验证荷载的效应考察,探讨了随机性验证荷载的有效性问题。

The basic principle of proof load method is introduced and the ultimate principle for distinguishing the validity of proof load method is discussed. Through the survey of proof load＇s validity in the two-dimensional space of standard normal distribution, the essential that proof load method can have an effect on structure＇s reliability is analyzed. Based on the results of numerical calculation combining with theoretical analysis, the factors that affect the validity of assured proof load and the rules of the validity＇s changing are discussed. Accordingly, the confines that proof load method can be applied is obtained and the lower limit of an assured proof load that can have an effective influence on structure reliability in common states is given too. Based on the assured proof load method, the proof load method is extended and the universal definition of broad proof load method is given. By the survey of stochastic proof load＇s effect in the three-dimensional space of standard normal distribution, the validity of stochastic proof load is discussed.