梁拱組合體系橋動(dòng)力特性及地震響應(yīng)研究
[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.
【學(xué)位授予單位】:西南交通大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:U441.3
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