Benchmark模型结构两阶段损伤诊断

Two-stage damage diagnosis for the benchmark model structure

为准确地评估结构健康状况,提出了一种基于结构振动特性的两阶段损伤诊断方法。由归一化的损伤指标确定可能出现损伤的单元位置,采用二阶特征灵敏度分析法确定可能损伤单元的损伤程度。考虑3种对称损伤模式和1种非对称损伤模式,对由国际结构控制协会与美国土木工程学会(IA SC-A SCE)提出的健康监测B enchm ark模型结构第二阶段有斜撑的情况进行模拟分析。结果表明:该方法能够有效地识别出结构损伤单元的位置与严重程度。

A two-stage damage diagnosis method was developed to evaluate the structural health of various types of buildings. A normalized damage index was used in the first stage to locate possibly damaged elements. The damage extent was estimated in the second stage using the second-order eigen-sensitivity approximation method. Four known damage cases （3 symmetric and 1 asymmetric） for braced structures were analyzed for the analytical benchmark problems 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 indicate that this method effectively identifies the location and severity of the damage in all the benchmark problems.