公路桥梁运营安全监测技术研究

发布时间：2018-01-06 18:22

本文关键词：公路桥梁运营安全监测技术研究　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着使用年限增长、环境条件变化、材料性质退化、车辆超载和交通量剧增等因素影响，公路桥梁结构性能都会经历一个逐渐衰减的过程，当桥梁发生各种病害、构件损伤或构件局部破坏等情况时，则需要对此类桥梁进行必要的运营阶段监测，其目的在于保障桥梁安全运营的前提下，并为下一步的结构维修或加固提供决策依据。与新建桥梁施工监控技术相比，对于服役年限较长且发生各种病害的桥梁进行运营阶段的使用性能监测，需要考虑的监测内容和对象都存在很大的不同，因此针对目前我国公路桥梁的现状开展既有公路桥梁运营阶段的安全监测技术研究具有一定的实际意义。本文以广东省内三种典型形式的既有桥梁结构为工程背景，，在桥梁病害和结构现状调查工作的基础上，利用空间结构有限元方法对桥梁结构整体受力性能进行了研究，制定了符合实际情况的桥梁运营阶段安全监测技术方案和预警指标阈值，从而为评估桥梁结构状况提供了可靠依据。本文主要研究内容如下：（1）针对既有桥梁安全监测的主要工作内容、监测设计原则、主要监测技术和监测系统涉及的传感器网络、桥梁结构状况的可靠性评估的研究现状进行了简述。（2）针对既有桥梁结构有限元分析方法进行了研究。针对混凝土桥梁构件病害类型、形成原因及其危害程度进行了分级和归类，总结和归纳了混凝土收缩徐变特性的计算模型并进行了对比分析，阐述了带裂缝工作的混凝土构件有限元分析模型和计算方法。（3）以广东省境内三种典型公路桥梁结构为工程背景，针对公路桥梁运营监测技术、既有桥梁运营安全性分析方法及其实施进行了研究。在对桥梁实际病害和构件力学性能进行详细检测的基础上，建立了考虑桥梁现状的三维有限元分析模型并采用MIDAS/FEA有限元分析软件进行了仿真分析，根据计算得到的结构最不利荷载效应分布规律和数值范围，确定了运营阶段桥梁安全监测的变形、受力控制部位和监测传感器的选型依据，从而为制定既有桥梁运营阶段监测技术方案、确定桥梁健康状况监测预警指标提供了科学依据。本文开展有监测工作实践验证了相关研究成果的有效性和合理性。
[Abstract]:With the increase of service life, the change of environmental conditions, the degradation of material properties, the overloading of vehicles and the increase of traffic volume, the structural performance of highway and bridge will undergo a process of gradual decay. When there are various diseases, component damage or local damage of the bridge, it is necessary to monitor the necessary operation stage of the bridge, the purpose of which is to ensure the safe operation of the bridge. Compared with the new bridge construction monitoring technology, it monitors the service performance of the bridges with long service life and various diseases. The monitoring contents and objects that need to be considered are very different, so it is of certain practical significance to study the safety monitoring technology of existing highway bridges in view of the present situation of highway bridges in China. Based on the engineering background of three typical forms of existing bridge structures in Guangdong Province, this paper is based on the investigation of bridge diseases and structures. The finite element method of spatial structure is used to study the overall mechanical performance of bridge structure, and the technical scheme of safety monitoring and the threshold value of early warning index are established according to the actual situation of the bridge operation phase. Thus it provides a reliable basis for the evaluation of bridge structure. The main contents of this paper are as follows: 1) aiming at the main work content of the existing bridge safety monitoring, the monitoring design principle, the main monitoring technology and the sensor network involved in the monitoring system. The research status of reliability assessment of bridge structure is briefly described. (2) the finite element analysis method of existing bridge structure is studied, and the causes and damage degree of concrete bridge member are classified and classified according to the type of disease of concrete bridge member. The calculation model of shrinkage and creep characteristics of concrete is summarized and compared. The finite element analysis model and calculation method of concrete members with cracks are expounded. Based on the engineering background of three typical highway bridge structures in Guangdong Province, this paper aims at the monitoring technology of highway bridge operation. The existing bridge operation safety analysis method and its implementation are studied. Based on the detailed detection of the actual bridge diseases and the mechanical properties of the components. The 3D finite element analysis model considering the current situation of bridge is established and the simulation analysis is carried out by using MIDAS/FEA finite element analysis software. According to the distribution law and numerical range of the most unfavorable load effect of the structure, the deformation of bridge safety monitoring, the force control position and the selection basis of the monitoring sensor are determined. Thus, it can be used to establish the monitoring technology scheme of the existing bridge operation stage. It provides a scientific basis to determine the monitoring and early warning index of bridge health condition. The effectiveness and rationality of the related research results are verified by the practice of monitoring in this paper.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446

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