摘要
Abstract
In the safety analysis of engineering structures,it is a challenging frontier topic to quantitatively assess the structural robustness.The prime points of the study are how to quantify the structure ability to avoid disproportional consequences under sudden local damage,and how to identify the critical part inside the structure that may seriously affect the whole system.According to the characteristics of direct and indirect consequences by sudden events,the perturbation of member sections and the variation of nodal potential energy were chosen to describe the structural disturbance and nodal interaction change,respectively.A transfer matrix was used to establish the relationship between the two quantities.The member influence could be quantified by the 2-norm of matrix column vector,and the member with the greatest influence was the most important part of the structure.The 2-norm of the matrix itself reflected the structural inhibition ability to disturbances,and the index of structural robustness was defined accordingly.The study on an underground frame structure in Minhang Shanghai verifies the rationality of the analytical method.At the same time,in the purpose of guiding the practical engineering design,the research shows that the robustness of underground structures can be increased by reducing the buried depth and stories,adding spans,making the configuration symmetrical and enhancing the key member.关键词
结构鲁棒性/定量分析/构件影响性/关键部位/结构扰动/节点势能/传递矩阵/地下框架结构Key words
structural robustness/quantitative analysis/member influence/critical part/structural disturbance/nodal potential energy/transfer matrix/underground frame structure分类
建筑与水利
