基于易损性与冗余度分析的构件重要性评价方法

为合理评价构件在结构中的重要性，以构件材料的弹性模量为基本参数，并考虑构件刚度变化产生的影响，基于构件应变能对材料弹性模量的敏感性，建立了构件冗余度及其易损性评价指标，以衡量构件的脆弱性和冗余特性。在此基础上将构件的重要性指标定义为构件易损性系数与冗余度系数的比值，实现构件重要性的分类量化。结果表明，采用的构件重要性评价指标能正确反映构件在结构中的重要性，重要性系数高的构件为结构的高易损-低冗余构件，是结构的关键部位和薄弱环节所在，其失效后对结构整体性能的影响较大。加强高易损-低冗余关键构件对于提高结构的整体性能和抗连续倒塌的能力具有重要作用。

The importance evaluation of structural components based on the analysis of vulnerability and redundancy

In order to evaluate the importance of the components in a structure,the modulus of elasticity of the material was taken as a basic sensitivity parameter to cover the influence of the change of the component stiffness on the structure, then two indexes were established to measure the redundancy and the vulnerability of the structural component based on the sensitivity of the component strain energy to the modulus of elasticity,and the importance coefficient of the component was defined as the ratio of the vulnerability to the redundancy,which reflects the component fragility to structural damage and its failure effect on the structural performance respectively.The result shows that the importance evaluation index of the component can reflects its importance in the structure correctly.The components with high importance coefficient are the weak parts of the structure,and their failure will take a great influence on the overall structural overall performance.It plays an important role in the promotion of the structural performance and the ability to resist progressive collapse by strengthening the important components of the structure.