论文部分内容阅读
在结构可靠性分析中,由于外载、材料性能参数等的随机性,在所有可能的失效模式中,必有少数几个失效模式其出现概率比其他失效模式要大得多,因此求取这为数不多的临界失效模式就是结构系统可靠性分析中一个主要课题.本文提出了求取杆系结构系统失效模式(即机构)的几何法.它是从几何方程出发,求得一机构,然后在此机构的基础上经过简单的矩阵相加.相乘就可得到其他机构.同时采用比例加载乘子λ这一物理意义明潦的参数来作为判别是否为临界机构的准则,效果很好.算例表明了此法的可行性,有效性.
In the structural reliability analysis, due to the randomness of the external load, material performance parameters, etc., in all possible failure modes, there must be a few failure modes whose probability of occurrence is much greater than other failure modes, so we must obtain this One of the few critical failure modes is a major issue in the structural system reliability analysis. This paper proposes a geometric method to determine the failure mode (ie, mechanism) of the bar system. It starts from the geometric equations and finds a mechanism. Based on this mechanism, a simple matrix addition and multiplication are used to obtain other mechanisms. At the same time, the physical meaning of the proportional load multiplier λ is used as a criterion for judging whether it is a critical mechanism, and the effect is very good. The example shows the feasibility and validity of this method.