高空广告牌结构的动力特性研究

发布时间：2018-03-29 22:23

  本文选题：高空广告牌　切入点：结构自振　出处：《东北石油大学》2017年硕士论文

【摘要】：随着社会经济快速发展,城市现代化及社会现代化的持续推进,中国高速公路网络建设日益发达。20世纪30年代,西方一些国家开始修建高速公路。到20世纪60年代,高速公路系统进行了快速发展时期。经济发展与发达的交通系统密不可分,作为现代化生活、生产不可或缺的运输工具,汽车已经融入了人类社会的各个地方,因此高速公路的建设成为了一个国家发展和繁荣的必备基础。毫无疑问,中国作为一个发展中国家,高速公路的建设正处于急速发展的时期。高速公路具有通行能力大,行车安全,降低运输成本,并且能够带动沿线经济发展的诸多优点。随着高速公路的快速发展,高速公路周边的大型广告牌也日益受到人们的重视。本项目采用有限元软件ANSYS对高空广告牌结构进行有限元模拟分析。分别对单立柱高空广告牌和双立柱高空广告牌进行自重下的模态分析、风荷载作用下的振动分析、地震作用下的动力特性分析。为不同结构形式广告牌的受力特性及设计方法提供参考。进行的具体内容如下:(1)应用有限元分析软件ANSYS中综合建模的方法,建立合理的单立柱高空广告牌结构和双立柱高空广告牌结构的有限元模型。(2)应用有限元分析软件ANSYS对广告牌结构的有限元模型进行了自振响应分析,得到了结构在自重作用下的振动周期和振动模态,对结构的自振特性进行了分析研究。发现结构的前两阶振型都为结构的整体振动,且对于单立柱高空广告牌结构,第一阶振型为结构平面内振动,而双立柱高空广告牌结构的第一阶振型为结构平面外振动。(3)在模态分析的基础上,采用几何非线性有限元的分析方法,应用有限元分析软件ANSYS对结构进行风振响应分析,得出了结构在风荷载作用下的动力响应。(4)应用有限元分析软件ANSYS对广告牌结构有限元模型进行地震响应分析。提取了广告牌结构在四种地震记录作用下的位移及应力云图,且绘制了广告牌结构的位移、反力及应力的时程曲线。通过对结果进行分析,提出了工程设计意见,为广告牌结构的工程设计和进一步研究提供了一定的参考。
[Abstract]:With the rapid development of social economy, urban modernization and the continuous advancement of social modernization, the highway network construction in China is increasingly developed. In the 1930s, some western countries began to build highways. The expressway system has carried on the rapid development period. The economic development and the developed transportation system are inseparable, as the modern life, the production indispensable transportation tool, the automobile has already melted into the human society each place, Therefore, highway construction has become an essential foundation for the development and prosperity of a country. There is no doubt that China, as a developing country, is in a period of rapid development. Traffic safety, reduce transportation costs, and can drive along the many advantages of economic development. With the rapid development of expressways, People pay more and more attention to the large billboards around the highway. The finite element software ANSYS is used to simulate and analyze the structure of the high altitude billboard. To carry out modal analysis under weight, Vibration analysis under wind load, Analysis of dynamic characteristics under earthquake. This paper provides a reference for the stress characteristics and design methods of billboards in different structural forms. The specific contents are as follows: 1) the method of integrated modeling in finite element analysis software ANSYS is used. The finite element model of the single and double column high altitude billboard structure is established. (2) the finite element analysis software ANSYS is used to analyze the natural vibration response of the billboard structure. The vibration period and vibration mode of the structure under the action of self-gravity are obtained, and the natural vibration characteristics of the structure are analyzed. It is found that the first two modes of the structure are the whole vibration of the structure, and for the high-altitude billboard structure of single column, the first two vibration modes of the structure are the whole vibration of the structure. The first vibration mode is the in-plane vibration of the structure, while the first mode of the double-column high-altitude billboard structure is the out-of-plane vibration of the structure. Based on the modal analysis, the geometric nonlinear finite element analysis method is used. The finite element analysis software ANSYS is used to analyze the wind-induced vibration response of the structure. The dynamic response of the structure under wind load is obtained. The finite element analysis software ANSYS is used to analyze the seismic response of the billboard structure finite element model. The displacement and stress cloud images of the billboard structure under the action of four kinds of seismic records are extracted. The time history curves of the displacement, reaction force and stress of the billboard structure are drawn. Through the analysis of the results, the engineering design advice is put forward, which provides a certain reference for the engineering design and further research of the billboard structure.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U417;TU311.3
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本文编号：1683135