基于动挠度监测的桥梁异常车辆荷载识别关键技术研究

发布时间：2018-04-16 15:02

本文选题：大跨度桥梁 + 挠度　；参考：《重庆交通大学》2015年硕士论文

【摘要】：近年来,国内部分桥梁在运营阶段由于缺乏有效的监测措施和必要的维修、养护出现了开裂、结构损伤、破坏倒塌等现象,引起了社会和政府的高度重视。所以,尽早发现并及时处理病害至关重要,对新建大跨度桥梁建设理论的发展也具有重要意义。本文以云南蒙新高速公路黑冲沟大桥项目为依托,开展了挠度监测、视频分析、车辆荷载与动挠度预警设计等研究,并设计了一套基于动挠度监测的桥梁异常车辆识别系统。主要研究内容:(1)基于北斗系统的挠度实时监测系统在黑冲沟大桥左右幅桥的中跨1/2处部署北斗系统对桥梁挠度进行实时监测,结合其他监测成果,构建桥梁健康监测大系统。(2)基于关键截面动挠度分析的桥梁预警模型和分级设置通过桥梁截面位移和动挠度理论分析、黑冲沟大桥有限元仿真,获取各种冲击荷载作用下桥梁结构动力响应的动挠度的信号,创建基于动挠度的安全预警模型和预警分级设置。(3)基于动挠度实时监测的结构安全风险溯源系统在动挠度监测数据和动挠度预警模型的基础上,将挠度监测系统数据和信息触发机制下的视频抓拍成果结合,构建基于结构动挠度响应的实时通行视频抓拍系统,分析通行车辆超载对桥梁的影响,实现高危车辆风险溯源。本文针对山区公路连续刚构大桥在运营阶段结构安全状态评估的需要,通过监测方法的选用和工程验证,实现了对桥梁的实时动态监测,并开发了一套可用于该型桥梁的挠度监测和结构安全溯源系统,为桥梁健康监测系统的发展提供了一种借鉴和参考。
[Abstract]:In recent years, due to the lack of effective monitoring measures and necessary maintenance, cracks, structural damage and collapse occurred in maintenance of some domestic bridges, which caused great attention by the society and the government.Therefore, it is very important to find and deal with the disease as soon as possible, which is of great significance to the development of the theory of new long span bridge construction.Based on the project of Heigonggou Bridge of Yunnan Mongol New Expressway, this paper studies deflection monitoring, video analysis, vehicle load and dynamic deflection early warning design, and designs a bridge abnormal vehicle identification system based on dynamic deflection monitoring.The main research content: 1: 1) the deflection real-time monitoring system based on Beidou system is deployed at 1 / 2 of the middle span of the left and right bridge of Heigonggou Bridge to monitor the deflection of the bridge in real time, combined with other monitoring results.The bridge early warning model based on dynamic deflection analysis of key sections and the hierarchical setting are constructed. The bridge displacement and dynamic deflection theory are analyzed and the finite element simulation of Heigonggou Bridge is carried out, which is based on the theoretical analysis of bridge cross-section displacement and dynamic deflection.The signal of dynamic deflection of bridge structure under various impact loads is obtained.Based on the dynamic deflection monitoring data and the dynamic deflection warning model, the structural safety risk traceability system based on the dynamic deflection real-time monitoring system is established, which is based on the dynamic deflection monitoring data and the dynamic deflection warning model.A real-time video capture system based on the structural dynamic deflection response is constructed by combining the video capture results of the deflection monitoring system with the information trigger mechanism. The influence of overloading on the bridge is analyzed to realize the risk traceability of high risk vehicles.In order to meet the need of structural safety assessment of continuous rigid frame bridge in mountain area, the real-time dynamic monitoring of the bridge is realized through the selection of monitoring methods and engineering verification.A set of deflection monitoring and structural safety traceability system for this type of bridge is developed, which provides a reference and reference for the development of bridge health monitoring system.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446

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