损伤结构为基准态的单元模态应变能损伤识别

以有损伤结构为基准模型,以单元模态应变能变化率为损伤识别指标对新发展损伤进行识别。通过理论分析和一连续箱梁桥的数值模拟,结果表明该方法对旧损伤的增长和新发展的单一损伤、密集损伤、多处损伤的识别都很敏感,原有损伤不会干扰新发展损伤的识别,这对于桥梁结构特别是在役桥梁结构的损伤识别和健康监测具有实用价值。

Damage Identification Based on Element Modal Strain Energy When Damage Structurs is Taken as Baseline Model

When the damaged structure is taken as the baseline model,new developed damages can be identified using the change of element model strain energy（MSE） as damage index.The theory analyses and numerical simulation of a continuous box beam bridge show that the MSE is sensitive to growth of old damage,single damage,intensive damage and multiple injuries.The original damage doesn＇t interfere the identification of new developed damage.It can be demonstrated that the method given has practical value in damage identification and health monitoring of bridges which have served for a long time.