基于柔度变化率的独塔斜拉桥模型损伤识别试验研究

Experimental Study on Damage Identification of a Single Tower Cable-stayed Bridge Model with Flexibility Changing Ratio

基于动力测试采用柔度变化率对一座独塔斜拉桥模型进行了损伤识别实用性研究,识别过程基于动力模态分析,激励方式包括车辆激励、锤击激励和环境激励,传感器布置方式包括稀布传感器和密布传感器两种方案。试验研究结果表明:柔度变化率可以识别梁式结构主梁的损伤位置;锤击激励产生的加速度信号损伤识别的效果最好;传感器的密布可以增加环境激励和车辆激励进行损伤识别的精度;斜拉桥的索力大小不影响柔度变化率进行主梁的损伤识别的效果。

Flexibility changing ratio based on dynamic test was carried out on damage identification of a single tower cable-stayed bridge model.Recognition process was based on dynamic model analysis.Exciting ways included vehicle excitation,hammer excitation and environmental excitation.Sensor arrangement way included sparse sensor plan and dense sensor plan.The experimental study results indicated：The flexibility changing ratio could be used to distinguish the damage of beam structure.The identification effect based on acceleration signal produced by hammer excitation was best.The dense sensor plan could increase the precision of damage recognition of environment excitation and vehicles excitation.The values of cable force had little influence on the damage localization effect of beam by the flexibility changing ratio.