摘 要： 本文介绍了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，得到了各种失效模式，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了范例。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。

Abstract: In this paper, The theory of structural vulnerability is introduced. The vulnerability of several truss structures were analyzed, clustering process and unzipping process were statements and receive a variety of failure scenario. The Analysis of truss structure verify the structure vulnerability theory and provide a model for structural vulnerability. By analysis of stress ratio under load, it is found that the bars which have the larger stress are also relative to deteriorating bars in structural vulnerability. It provides a new approach for structural vulnerability analysis. By analyzing the structure of the limit load under the action of concentrated force and vulnerability analysis of characteristic parameters, it is found that if clustering process is similar, the critical load increases with well-formedness.