框架机构的自动生成及体系可靠度

本文针对框架结构体系．基于结构矩阵分析来自动生成机构的极限状态方程，提出了寻找主要机构的失效树路径即“机构产生阶段分枝法”．通过对一个两跨十层框架结构主要失效模式的寻找及体系可靠度的计算说明了方法的可行性与实用性。

Automatic Generation of Mechanisms and System Reliability of Frames

The reliability analysis of frames mainly involves identification of the dominant failure modes and estimation of the system reliability.But it is very difficult and rather impossible to identify these dominant mechanisms.Many methods of searching for dominant mechanisms have been pro- posed.But most of them are not feasible in practice for large structures with high degrees of redundan- cy and complex loads because of theoretical and technical problems.For these problems,this paper proposes a practical method for reliability analysis of frame structures.It involves automatic genera- tion of dominant mechanisms and their safety margin equations by matrix method and failure tree paths.The bounds and point estimations are given to estimate the system reliability of frames.The re- suits of examples show very good agreement with those of other studies.The example of a tow-bay ten-storey frame is provided to further illustrate the validity and practicability of the proposed method.