失效路径长度对结构系统安全可靠性的影响

Influence of length of failure road for failure mode and safety reliability for complex steel structure system

运用钢结构系统可靠性的安全评定原则,以立体车库钢结构系统为研究对象,建立主要失效模式安全余量方程,计算失效概率。在对风载荷和地震载荷分布进行模拟的基础上,通过对立体车库大型钢结构系统的算例进行分析,探讨了失效路径长度对大型钢结构系统失效准则与安全可靠性的影响,提出在结构整体承载能力未出现下降的情况下,失效路径长度取得越大越好的结论。该结论对大型钢结构可靠性的工程应用有指导意义。

The present paper is aimed at studying the influence of length of failure road on the failure mode and safety reliability of the complex steel structure system in the complex mechanical structures. It is commonly known that the current reliability theory of the mechanical load is used in a variety of combinations. According to the failure features and failure modes, the probability of failure of a structure system can be determined by means of the probability theory. In addition, finite element method can also be used to identify the structural system failure and the reliability demands. In case of the largescale complex mechanical structure of the load, it is a necessity to take it as a standard to determine the practical specific application failure and failure characteristics to use the probability theory. When the system reliability safety assessment principles are used and the space parking steel structure system is taken as research object, it is necessary to discuss how to establish the safety equation of the main failure modes to explore the distribution of the wind loads and the seismic loads of space parking steel structure system by means of simulating the influence of failure load length on the failure rule and safety reliability. Thus it can be concluded that if the failure road length is greater, it would be easier to find the result of the problem. This conclusion proves to be a guide significant for the reliability engineering application of large steel structure system.