刚架系统稳定可靠性分析

Analysis on Stable Reliability of Rigid Frame

目前定义刚架系统失效是由于产生一定数量的塑性铰组合,使结构成为机构而造成的,没有考虑失稳的影响。本文采用分支限界法研究了刚架系统的可靠度,在计算中将失稳作为失效模式。构件失稳或形成塑性铰的顺序不同即失效路径不同,失效模式的安全余量也不同。因此,考虑失稳后结构的失效模式数明显增多。算例表明,稳定失稳的影响不可忽略。

At present,the failure of rigid frame system is defined due to the combination of some plastic hinges and the structure turning into mechanism, without taking into account the influence of member buckle. The reliability of the rigid frame system is studied by employing the method of branch boundary and the buckle of member is regarded as failure model in this paper. If the order of buckle or plastic kings is different, the failure modal is different. The number of failure modal increases obviously when thinking about buckle.The example indicates that the influence of buckle can't be ignored.