基于轨道交通斜拉桥应力监测的荷载识别技术  

Load Identification and Health Threshold Alarm of the Metro Bridge

作　　者：程辉[1,2] 钟继卫[1,2] 杨晓燕[1,2] 梅秀道[1,2] 王翔[1,2] 郭翠翠[1,2] 

机构地区：[1]中铁大桥局集团桥梁科学研究院有限公司,湖北武汉430034 [2]桥梁结构安全与健康湖北省重点实验室,湖北武汉430034

出　　处：《江南大学学报（自然科学版）》2015年第6期804-809,共6页Joural of Jiangnan University (Natural Science Edition)　

基　　金：湖北省自然科学基金项目(2013CFA135;2013CFB457;2015CFC887)

摘　　要：通过对轨道交通桥梁健康监测系统应力监测响应中温度及列车荷载响应进行分离,获得列车荷载作用下的桥梁应力响应时程曲线,提出利用列车通过桥上不同监测断面的时间间隔及信号互相关方法对车流量及行车速度进行识别,并提出了桥上列车交会的自动化分析和判断方法。采用轨道交通桥梁空车荷载作为基准荷载,对比分析列车正常运营时应力响应,对列车荷载进行识别,实现对客流量变化估计。将提出的方法应用于实桥监测数据的分析,验证了方法的有效性和可行性。By decomposing the temperature and the train load in the stress monitoring response for the rail bridge health monitoring system,we can obain the bridge stress reponse curve under the train load. Then the time interval of different sections and the signal cross-correlation coefficient are applied to identify the train traffic speed.Furthermore,the identification results of comparison are applied to judge whether two trains meet the bridge or not and to estimate the train traffic. Using the empty load of the rail bridge as the datum,comparing and analyzing the stress response of the train operation in common to identify train load and to estimate the changes of traffic. All the methods are used in the analysis of the actual bridge monitoring data to verify the effectiveness and feasibility of the methods.

关 键 词：轨道交通 应力响应 速度识别 荷载识别 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]