框架结构损伤识别的试验研究

Test Study on Frame Structural Damage Identification

结构损伤识别是开发结构安全监测系统中的一个重要课题。由于结构频率测试容易测试并且有较高的测量精度,因此成为损伤识别中广泛应用的模态参数。根据模态频率的灵敏度分析,本文提出了一种基于结构损伤前后频率变化测量的损伤参数识别方法,用于确定结构的损伤位置和损伤程度。多种工况的框架结构模型的损伤试验结果表明:对于层间剪切结构,通过结构频率变化率法可以确定结构的损伤位置和损伤程度。

The development of structural damage identification is an important theme in the structural safety monitoring system. The variation of structural frequency before and after the damage is believed to be a most available and widely used modal parameter because of its easy testability and high measure precision. According to the frequency sensitivity analysis, a damage parameter identification method is put forward in the present paper. The method uses only the frequency measurements before and after the damage occurred to locate the damage location and quantify the severity of the damage. Some models have been tested with a lot of cases including single - damage and multi - damage with different severity and locations. Test results show that for shear buildings, damage severity and location can be calculated using frequency change ratio method from structural frequency measurement.