变电站混凝土构架梁的损伤识别

Damage Identification of Concrete Frame Beam in Substations

我国早期建设的变电站多为混凝土结构,且已持续使用20年以上,结构损伤是不可避免的.介绍了两种基于频率的无损伤检测法:正则化频率变化率法可以识别构架梁的单一损伤,低阶的正则化频率变化率曲线及其组合曲线单调性好,损伤识别较准确.多裂缝识别法能够识别单一损伤和多处损伤的情况,尤其中度损伤的识别效果好.

Most substations built in China were concrete structures which have been in use for over 20 years. It indicates the inevitable structural damage. Two non-destructive testing methods based on frequency were introduced. The results show that the regularization frequency rate method can identify the single damage of frame beams. The monotonicity of the low-order regularization frequency rate curve and its combination curve are better, and the damage identification more accurate. Multi-fractures identification method can identify single damage and multiple damages, especially in the recognition of moderate damage.