基于被动敲击扫描式检测方法的工程桥梁损伤检测  

DAMAGE DETECTION OF IN-SERVICE BRIDGES BASED ON THE PASSIVE TAP-SCAN METHOD

作　　者：林萍 胡祝友 郭河 乔磊 向志海[3] LIN Ping;HU Zhuyou;GUO He;QIAO Lei;XIANG Zhihai(CCCC Infrastructure Maintenance Group Co.,Ltd.,Beijing 100011,China;CCCC Road&Bridge Inspection&Maintenance Co.,Ltd.,Beijing 101300,China;School of Aerospace Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]中交基础设施养护集团有限公司,北京100011 [2]中交路桥检测养护有限公司,北京101300 [3]清华大学航天航空学院,北京100084

出　　处：《力学与实践》2023年第6期1355-1362,共8页Mechanics in Engineering

摘　　要：损伤检测技术对于桥梁健康评估和管理至关重要。近年来,基于移动车辆的桥梁损伤检测方法因其简单易行的优点已引起广泛关注。其中,敲击扫描式检测方法通过在敏感频率上施加激励,可以大大提高车辆加速度对桥梁局部刚度变化的灵敏度,而且由于敏感频率远离环境噪声频段,可以保证足够高的信噪比。如果采用车轮激励这种被动方式来产生敲击力,还可以进一步简化检测车的硬件系统,便于现场实施。本文报导了采用被动式敲击扫描检测车对两座在役桥梁的现场试验结果。实测数据表明,该方法不但可以定量地给出桥梁主梁刚度变化率的定量评估指标,还可以发现支座脱空类损伤。这些发现验证了被动敲击扫描式检测方法的实用性,展示了它在桥梁快速损伤检测方面的工程应用价值。Damage detection technology is vital for bridge health assessment and management.In recent years,the bridge damage detection method using moving vehicles has attracted widespread attention because of its simple and easy operation.Specifically,the tap-scan method can improve the sensitivity of vehicle acceleration to the bridge stiffness change by applying excitation around the sensitive frequency.Since the sensitive frequency is far away from the environmental noise frequency band,a high signal-to-noise ratio can be achieved.A more portable damage detection vehicle can be designed for on-site implementation if the specific toothed wheel is applied to generate tapping force.This paper reports the field test results for two bridges in service using the passive Tap-scan vehicle.The measured data show that this method can not only detect the stiffness change ratio of the main beam but also find the support emptying.These findings verify the practicability of the passive Tap-scan method and demonstrate its engineering application value in the rapid damage detection of bridges.

关 键 词：敲击扫描方法 桥梁损伤检测 被动式方法 工程应用 

分 类 号：O326[理学—一般力学与力学基础]