基于现场实测的大跨度斜拉桥静风作用研究

发布时间：2018-03-03 00:33

本文选题：现场实测　切入点：主梁断面　出处：《湖南科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：对于桥梁结构而言，风荷载是进行结构设计的重要控制荷载之一。桥梁结构因风的作用而遭到破坏的事故屡见不鲜。随着桥梁跨径的进一步增大，桥梁结构对风的作用更加敏感，风荷载作用下桥梁结构的抗风性能已成为影响其设计和施工的控制因素。因此，研究桥梁结构在风荷载作用下的风压分布规律对于结构的抗风设计研究起着至关重要的作用。目前，进行结构抗风研究的方法主要包括三种，即：风洞试验、数值模拟和现场实测。其中，现场实测采集得到的试验数据更加符合实际结构动力特性的优点，是进行结构抗风研究最可靠的方法。然而，因为现场实测过程中天气条件的不可控制性和各种客观因素的影响，目前，国内外通过现场实测的方法对桥梁结构进行抗风性能研究的文献仍相对较少。本文以湖南省岳阳市洞庭湖大桥为依托工程，通过现场实测研究主跨跨中主梁断面以及主塔塔顶的风场和风压特性，从而为今后进行类似大跨度桥梁结构的抗风设计及相关研究提供可靠的参考依据。本文的主要工作如下： 1.应用流体传输管道动力学的基本理论知识分析传压管路系统的频响特性；设计适用于本文的风压测量系统并通过试验验证其准确性，确保试验数据的真实可靠。 2.根据试验目的在主梁及塔顶选择合适位置布置测点，完成传压管的铺设并对试验仪器进行调试；进行至少两次较为成功的风场、风压观测试验。 3.通过Matlab数值分析软件对试验数据进行处理，得到主梁断面与塔顶的风场特性参数、风压分布特性、风压与风场的相关性以及静力三分力系数与风场的相关性，并对结果进行分析。
[Abstract]:For bridge structure, wind load is one of the important control loads for structural design. The bridge structure is more sensitive to the wind, and the wind-resistant performance of the bridge structure under the wind load has become the control factor that affects the design and construction of the bridge structure. It is very important to study the wind pressure distribution law of bridge structure under wind load. At present, there are three main methods to study the wind resistance of bridge structure, namely, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test, wind tunnel test and wind tunnel test. Numerical simulation and field measurement. Among them, the experimental data obtained from the field measurement is more in line with the advantages of the dynamic characteristics of the actual structure, and is the most reliable method for the study of structural wind resistance. Because of the uncontrollable weather conditions and the influence of various objective factors in the field measurement process, at present, There are few literatures on the wind-resistant performance of bridge structure through the method of field measurement at home and abroad. This paper is based on the Dongting Lake Bridge in Yueyang City, Hunan Province. The wind field and wind pressure characteristics of the cross section of the main girder and the top of the main tower tower are studied in situ, thus providing a reliable reference for the wind resistant design and related research of similar long-span bridge structures in the future. The main work of this paper is as follows:. 1. The frequency response characteristics of the pressure transmission pipeline system are analyzed by using the basic theoretical knowledge of fluid transfer pipeline dynamics, and the wind pressure measurement system is designed and verified by experiments to ensure the reliability of the test data. 2. According to the purpose of the test, the proper position of the main beam and the top of the tower is chosen to lay out the pressure transfer pipe and to debug the test instrument, and at least two successful wind field and wind pressure observation tests are carried out. 3. The test data are processed by Matlab software, and the parameters of wind field characteristic, wind pressure distribution, the correlation between wind pressure and wind field and the correlation between static three-point force coefficient and wind field are obtained. The results were analyzed.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.27

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