中小桥梁群运营期结构状态监测系统研究

发布时间：2018-02-08 13:52

本文关键词： 中小桥梁监测评估应用　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国交通事业的飞速发展,桥梁数量日益增多,其中中小桥数量占到桥梁总数的90%以上,在公路运输系统中发挥着重要作用,其运营安全对于保障交通运输通畅、促进社会经济发展具有重要意义。目前,中小桥主要采用人工检查的方式来检测和评估其运营过程中的技术状况,这种方式的局限性使得桥梁安全得不到很好的保障,而传统的桥梁健康监测系统费用昂贵,难以在中小桥梁上推广应用。故本文在传统桥梁监测技术基础上,引入云计算技术,利用云计算技术在IT资源成本和效率等方面的优势,降低中小桥梁监测系统的建设成本,提升系统的部署效率,使得中小桥运营监测得以实现。论文具体研究内容如下:①基于云平台的中小桥梁群监测系统实现。主要对系统架构方案和系统软件进行简介。其中基于云平台的系统架构方案是采用虚拟机替代传统的物理服务器,具有硬件成本低、软件易于开发、系统部署效率高、系统运行稳定性好等优点,这些优点使得中小桥梁运营监测得以实现;在此基础上简介了系统软件的组成及其各自的功能。②基于静态有限监测数据的中小桥梁运营状况评估技术。首先从理论上介绍了裂缝的分类、成因和一般形成位置,然后选取300余座各类型的中小桥梁,对其裂缝位置和裂缝数量进行统计,找出最易发生裂缝病害的桥梁类型及其部位,最后提出了基于多数据源的中小桥梁结构安全评估技术。③传感器对结构响应敏感性分析。以实桥新村中桥为对象,采用有限元模拟的方式,研究桥梁结构在恒载作用下,主梁之间的横向联系发生变化或主梁自身承载力下降时,引起的各片主梁之间的挠度、应变差值变化情况以及主梁自身挠度、应变变化情况,最后通过现有传感器的识别精度来判断桥梁的此类损伤是否能被监测系统识别。④数据异常和温度效应分析。主要对新村中桥2014年6月至11月的应变监测数据进行了异常分析和温度影响分析,监测数据异常分析的主要内容有预警值设置、大于200με较大应变统计和交通量调查;温度影响分析首先是判断温度与应变的关系,再指出传统仪器温度修正的不足,最后提出了一种基于最小二乘法的新的修正方法。
[Abstract]:With the rapid development of transportation in our country, the number of bridges is increasing day by day, in which the number of medium and small bridges accounts for more than 90% of the total number of bridges, which plays an important role in the highway transportation system. It is of great significance to promote the social and economic development. At present, the medium and small bridges mainly use manual inspection to detect and evaluate the technical situation in their operation, and the limitations of this way make the bridge safety not well guaranteed. The traditional bridge health monitoring system is expensive and difficult to be popularized on medium and small bridges, so this paper introduces cloud computing technology on the basis of traditional bridge monitoring technology, and makes use of cloud computing technology in IT resource cost and efficiency. Reduce the construction cost of small and medium-sized bridge monitoring system, improve the system deployment efficiency, The main contents of this paper are as follows: 1. Implementation of small and medium bridge group monitoring system based on cloud platform. The system architecture scheme and system software are introduced. The architecture of the system is to replace the traditional physical server with virtual machine. It has the advantages of low hardware cost, easy development of software, high efficiency of system deployment, good stability of system operation and so on. On this basis, the composition of the system software and its respective functions are briefly introduced. 2. Based on the static limited monitoring data, the evaluation technology of the operation condition of small and medium-sized bridges is introduced. Firstly, the classification, cause of formation and general position of the cracks are introduced theoretically. Then, more than 300 small and medium-sized bridges of various types are selected, and the crack position and the number of cracks are counted to find out the bridge types and their parts that are most prone to crack diseases. Finally, a multi-data source based safety assessment technique for small and medium sized bridges is proposed. The sensitivity of the sensor to the structural response is analyzed. The bridge structure under dead load is studied by finite element simulation with the real bridge Xincun bridge as an object. When the transverse connection between the main beams changes or the bearing capacity of the main beams decreases, the deflection, the strain difference between the main beams and the deflection and strain changes of the main beams are changed. Finally, the identification accuracy of the existing sensors is used to determine whether the bridge damage can be identified by the monitoring system. The strain monitoring data of Xincuanqiao from June 2014 to November are analyzed. Anomaly analysis and temperature impact analysis, The main contents of abnormal analysis of monitoring data include the setting of early warning value, the statistic of large strain greater than 200 渭蔚 and the investigation of traffic volume, the analysis of temperature effect is to judge the relationship between temperature and strain, and the deficiency of temperature correction of traditional instrument is pointed out. Finally, a new correction method based on least square method is proposed.
【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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