梁拱组合体系桥动力特性及地震响应研究

发布时间：2018-10-18 12:14

【摘要】：梁拱组合桥作为一种新型的桥梁结构形式,将传统的拱和梁两种结构体系结合起来共同受力,可以充分发挥梁和拱各自优势、避免劣势。近年来,随着我国经济、桥梁设计理论和施工技术的不断发展,梁拱组合桥以其优美的造型、特有的受力特点,被越来越广泛地应用在大跨度桥梁上,尤其是高速铁路建设中。因此研究这类桥梁的动力特性及其地震响应问题具有重要的理论和现实意义。本文以实际工程为基础,借助大型数值分析软件,创建了3D数值仿真模型。研究了梁拱组合体系桥梁的动力特性和地震响应规律。同时综合运用反应谱法和时程分析法研究了这类桥梁在地震作用下的空间动力响应特点。主要完成了以下几个方面的工作：(1)对梁拱组合桥的产生和发展现状进行了综述,分析了该类桥的受力特点和优势。(2)对国内外关于梁拱组合桥的抗震研究现状和桥梁地震响应分析方法方面的文献资料进行了归纳,阐述了梁拱组合桥抗震设计的重要性和必要性。分析了静力法、反应谱法、时程分析法等目前常见桥梁抗震分析方法的特点,进而选定了适合本文研究需要的分析理论和方法。(3)以实际工程为基础,借助于桥梁通用软件Midas Civil建立了空间三维仿真数值模型；研究了梁拱组合体系桥梁的自振特性；系统分析了这类桥梁对主拱肋刚度、结构质量、吊杆型式、主梁支承条件等参数的动力参数敏感度。(4)以实际工程为基础,用反应谱法对梁拱组合体系桥进行了地震响应分析,重点探讨了地震作用方向对结构关键部位位移和内力的影响效应。此外,为进一步广泛的探讨这类桥梁结构在地震持续作用下的反应特点,本文还采用时程分析法有针对性的对梁拱组合桥进行了地震响应分析,并将上述两种方法计算的结果进行了对比性分析。
[Abstract]:Beam-arch composite bridge as a new type of bridge structure, the combination of traditional arch and beam structure system together, can give full play to the respective advantages of beam and arch, avoid disadvantages. In recent years, with the continuous development of economy, bridge design theory and construction technology in China, beam and arch composite bridges are more and more widely used in long-span bridges, especially in the construction of high-speed railway. Therefore, it is of great theoretical and practical significance to study the dynamic characteristics and seismic response of this kind of bridges. On the basis of practical engineering, a 3D numerical simulation model is established with the aid of large-scale numerical analysis software. The dynamic characteristics and seismic response of beam-arch composite system bridges are studied. At the same time, the response spectrum method and time history analysis method are used to study the spatial dynamic response of this kind of bridge under earthquake action. The main works are as follows: (1) the generation and development status of beam and arch composite bridges are summarized. The characteristics and advantages of this kind of bridges are analyzed. (2) the current situation of seismic research and seismic response analysis methods of beam and arch composite bridges at home and abroad are summarized. The importance and necessity of seismic design of beam-arch composite bridge are expounded. This paper analyzes the characteristics of the common seismic analysis methods of bridges, such as static method, response spectrum method and time-history analysis method, and then selects the analysis theory and method suitable for the research needs of this paper. (3) based on the practical engineering, With the help of the general software Midas Civil, the spatial three-dimensional simulation numerical model is established, the natural vibration characteristics of the bridge with beam-arch composite system are studied, the stiffness of the main arch rib, the quality of the structure and the type of the suspender are systematically analyzed. (4) based on the actual engineering, the seismic response of the beam arch composite system bridge is analyzed by using the response spectrum method. The effect of the direction of earthquake action on the displacement and internal force of the key part of the structure is discussed. In addition, in order to further explore the response characteristics of this kind of bridge structure under the continuous earthquake, this paper also uses the time-history analysis method to analyze the seismic response of the beam-arch composite bridge. The results of the above two methods are compared and analyzed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U441.3

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