双塔混合梁斜拉桥结构监测的易损件分析
本文关键词: 桥梁健康监测 易损件分析 正常运营 极端荷载 出处:《福州大学》2014年硕士论文 论文类型:学位论文
【摘要】:近三十年来,为了满足国民经济发展的需要,我国建立了大量的铁路、公路、桥梁。然而,频繁发生的桥梁安全事故给我们敲响了警钟。桥梁结构在投入运营之后,将不可避免的发生超载以及材料性能退化等现象,这将使桥梁结构的安全受到挑战。因此,通过对具体桥型进行具体分析,了解桥梁结构的易损件和易损部位,从而便于桥梁结构后期的日常管理、养护、监测以及预警的工作具有很大的意义。首先,简单介绍了易损性的定义及其影响因素,并深入总结了桥梁健康监测与易损件分析之间的关系,阐述了本文的研究目的和主要内容。其次,本文详细探讨了斜拉桥各个构件的有限元模拟方法,以淮安闽江大桥(45+67+416+67+45m)为工程背景,通过有限元分析软件ANSYS10.0建立斜拉桥的计算模型,并利用实测数据对有限元模型进行调整。然后,分析了桥梁在正常运营情况下的车辆荷载效应,并对斜拉桥在正常运营情况下进行结构易损件分析,找到斜拉桥在正常运营情况下的易损件和易损部位。而且利用IBIS-S微变形远程监测雷达系统对斜拉桥在正常运营情况的变形进行实时监测,获得了桥梁主跨各点在正常运营情况下的动挠度时程曲线及竖向频率,介绍了如何利用这些实测数据初步判别桥梁的健康状况。最后,介绍了极端荷载的种类,并根据具体的情况分别对斜拉桥在超载、构件性能退化、台风三种情况下的易损件进行分析,从而得到斜拉桥结构在极端荷载下的易损件和易损部位。本文通过提出这样的思路和方法,从而为今后的桥梁健康监测传感器的布置及预警系统的设计提供指导,同时可以为今后同类桥型的设计提供借鉴。总而言之,这样的尝试和探讨具有一定的工程意义。
[Abstract]:In the past 30 years, in order to meet the needs of national economic development, China has established a large number of railways, highways and bridges. However, the frequent accidents of bridge safety have sounded the alarm bell for us. After the bridge structure has been put into operation, Overloading and material degradation will inevitably occur, which will challenge the safety of the bridge structure. Therefore, through the specific analysis of the specific bridge type, we can understand the vulnerable parts and vulnerable parts of the bridge structure. Therefore, it is of great significance to facilitate the daily management, maintenance, monitoring and early warning of bridge structure in the later stage. Firstly, the definition of vulnerability and its influencing factors are briefly introduced. The relationship between bridge health monitoring and damage analysis is summarized, and the purpose and main contents of this paper are expounded. Secondly, the finite element simulation method of each component of cable-stayed bridge is discussed in detail. Taking the Huaian Minjiang River Bridge 4567 416 67 45m as the engineering background, the calculation model of the cable-stayed bridge is established by the finite element analysis software ANSYS10.0, and the finite element model is adjusted by using the measured data. This paper analyzes the vehicle load effect of the bridge under normal operation, and analyzes the structural damage parts of the cable-stayed bridge under the normal operation condition. Find the vulnerable parts and vulnerable parts of cable-stayed bridge under normal operation condition, and use IBIS-S micro-deformation remote monitoring radar system to monitor the deformation of cable-stayed bridge in normal operation in real time. The dynamic deflection time history curve and vertical frequency of each point of the main span of the bridge under normal operation conditions are obtained, and how to use these measured data to judge the bridge health condition is introduced. Finally, the types of extreme loads are introduced. According to the concrete situation, the paper analyzes the vulnerable parts of the cable-stayed bridge under the conditions of overload, degradation of component performance and typhoon. Thus, the vulnerable parts and vulnerable parts of cable-stayed bridge structures under extreme loads are obtained. This paper provides guidance for the design of bridge health monitoring sensors and early warning systems in the future by putting forward such ideas and methods. At the same time, it can be used for reference for similar bridge design in the future. In a word, such attempt and discussion have certain engineering significance.
【学位授予单位】:福州大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:U446
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