基于特征灵敏度的Benchmark结构损伤诊断

为准确地评估结构的健康状况,提出了一种两阶段损伤诊断方法.引入柔度差值斜率的概念确定结构可能出现损伤单元的位置,采用基于二阶特征灵敏度的方法确定可能损伤单元的损伤程度.应用该方法对由国际结构控制协会与美国土木工程学会(IASC-ASCE)提出的健康监测Benchmark结构进行了分析.结果表明,两阶段损伤诊断方法能够准确地定出可能损伤单元的位置与损伤程度,识别结果与真实的损伤接近,说明该诊断方法是有效的.

Damage Diagnosis of a Benchmark Structure Based on the Eigen-Sensitivity Analysis

In order to evaluate structural health status accurately, a two-stage damage diagnosis was proposed. The slope of flexibility difference was introduced to locate possible damage elements, and the damage extent was estimated using the second order eigen-sensitivity approximation method. This damage diagnosis was employed to analyze Benchmark model structure proposed by the International Association for Structural Control and the American Society of Civil Engineers (IASC-ASCE) Task Group on Structural Health Monitoring. The results show that the location and extent of possible damage elements are determined by this two-stage damage diagnosis method, pretty close to the real damage values. So this method is effective and the diagnosis results are satisfactory.