基于结构构形易损性理论的桁架结构分析

Analysis of truss structures based on vulnerability theory

介绍基于结构构形的易损性理论,具体分析了几种桁架结构的易损性,详细表述了结构集簇解簇过程,得到各种失效模式,验证了基于结构构形的易损性理论,为结构易损性分析提供范例。发现结构应力较大的杆件与易损性分析的失效杆件有对应关系,为结构易损性分析提供了新的思路;通过分析结构在集中力作用下极限荷载与易损性分析特征参数,发现如果结构形式相同、集簇过程类似,那么随着连接能力的增大结构临界荷载增大。

The theory of structural vulnerability was introduced. The vulnerability of several truss structures were analyzed, the clustering process and unzipping process were described and a variety of failure scenario were presented. Through the analysis of truss structure, the structure vulnerability theory was verified and a model for structural vulnerability analysis Was provided. By the analysis of stress ratio, it is found that the highly stressed bars usually correspond to the deteriorated bars in the analysis of structural vulnerability. With this idea, a new approach for structural vulnerability analysis was provided. By analyzing the structure under the action of limited concentrated force and considering the vulnerability under different characteristic parameters, it is found that with the same clustering process, the critical load increases with the increase of connection capability.