噪音环境下桥梁损伤声发射定位技术研究  

Research on the location technology of bridge damage based on acoustic emission under ambient noise

作　　者：刘茂军[1] 葛若东[2] 王根伟[1] 

机构地区：[1]桂林理工大学南宁分校,广西南宁530001 [2]广西大学土木建筑工程学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2015年第1期155-162,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：广西自然科学基金项目(2011GXNSFA018031);2014年度广西高校科研项目(YB2014169)

摘　　要：为研究噪音环境下桥梁损伤的声发射定位方法,并获取相应的技术参数,在一座运营中的预应力钢筋混凝土桥梁的箱梁内部进行了声发射定位试验,通过定位参数的选取、断铅模拟损伤的声发射定位试验、声发射信号的滤波除噪、定位图聚类等一系列试验,达到了比较满意的定位效果,定位误差控制在50 mm以内,并获得了桥梁检测中的声发射门槛值、定位波速以及三个定位时间参数值[峰值定义时间(PDT)、撞击定义时间(HDT)、撞击锁闭时间(HLT)]。试验结果表明,在运营桥梁上进行声发射损伤定位时,门槛值设为40 d B可以滤除大部分环境噪音,同时通过关联图对比分析、利用数字滤波除噪,并对定位图进行聚类,可以进一步提高定位精度,最终误差可以控制在50 mm以内。研究结果可为声发射损伤定位技术在桥梁检测及监测方面的推广应用提供借鉴。In order to develop abridge damage location method under ambient noise and to obtain corresponding acoustic emission parameters,an acoustic emission location test was performed in the box girder of an in-service pre-stressed concrete bridge.By selecting location parameters,by performing acoustic emission location test and breaking leads to simulate damage,by filtering acoustic emission signal and locating graph clustering,a relatively satisfying location effect is obtained with the location error controlled in less than 50 mm.The acoustic emission detection threshold,the wave velocity,as well as the three location time values including the peak definition time（PDT）,hit definition time（HDT） and hit locking time（HLT） were obtained.The test shows that,during the location of damage by acoustic emission on an in-service bridge,most of the ambient noise can be filtered out by setting the threshold value to 40 d B,and through the correlation diagram analysis,the use of digital filtering,and clustering location graph,the location accuracy can be further improved.The final error can be controlled within 50 mm.The research results can provide reference for acous-tic emission damage location technology in bridge inspecting and monitoring.

关 键 词：环境噪音 桥梁 损伤 声发射 定位 聚类 

分 类 号：U446.3[建筑科学—桥梁与隧道工程]