深圳大学学报（理工版）Issue(5)：504-512,9.DOI:10.3724/SP.J.1249.2014.05504
改进敏感性指标法的杆系结构易损性分析
Vulnerability analysis of truss structure by an improved sensitivity index method
摘要
Abstract
To analyze the vulnerability of truss structure, the structural sensitivity index suggested by the Japan Steel Construction Society was replaced by a member sensitivity index for reflecting the influences of removing bars. The member sensitivity index of a trapezoid truss in two dimensions was calculated by finite element software ALGOR un-der five working conditions of removing bars. The feasibility of member sensitivity index method was validated in de-termining the destroyed sequences of structural members and identifying the mode of structural collapse. Vulnerabili-ty analysis of truss structure was conducted by using the member sensitivity index method, structural member sensi-tivity indexes of remained bars. The structural vertical displacements under different working conditions of truss string structure with double cables were analyzed to illustrate the mechanism of vulnerability changes of truss string structure with the help of redundant cable. A dynamic progressive collapse characteristic analysis of truss string structure with double cables was carried out by the member sensitivity index method through finite element software ANSYS, by which the dynamic failure mode and progressive collapse characteristic of truss string structure with double cables were obtained. The results show that the member sensitivity index method is effective in analyzing vulnerability of spatial truss structure. The structural redundancy degree is increased by setting redundant cable and X-type supporting bars, which decrease member sensitivity index and structural vulnerability and enhance structural anti-progressive collapse ability under dynamic loads. The member sensitivity index method is verified to be feasible in analyzing vulnerability of truss structure.关键词
空间结构/杆系结构/张弦桁架结构/易损性分析/敏感性指标/抗连续倒塌Key words
spatial structure/truss structure/truss string structure/vulnerability analysis/sensitivity index/anti-progressive collapse分类
建筑与水利引用本文复制引用
刘国光,武志玮,程国勇,陈琦..改进敏感性指标法的杆系结构易损性分析[J].深圳大学学报（理工版）,2014,(5):504-512,9.基金项目
国家自然科学基金资助项目(51008065) （51008065）
中国民航大学青年骨干教师资助项目(10700222)@@@@National Natural Science Foundation of China (51008065) （10700222）
Young Teacher Training Plan of Civil Aviation University of China (10700222) （10700222）
