鋼箱—混凝土組合橋梁結(jié)構(gòu)地震響應(yīng)分析
[Abstract]:The upper part of steel box-concrete composite bridge is composed of reinforced concrete deck slab and lower steel box girder. Because the substructure adopts the form of steel box girder, it can replace the prestressed reinforced concrete small box girder which is widely used in the original bridge structure, which can reduce the weight of the structure to a great extent. Thus, the application of bridge structure in long span bridge is realized. In recent years, the seismic behavior of bridges has received much attention. Based on the existing research results, the seismic response law of steel box-concrete composite bridges with openings / closures is discussed in this paper. The main contents of this paper are as follows: 1) this paper simplifies the solid structure with a practical project. The spatial finite element model of the open / closed steel box-concrete composite bridge is established by using the finite element software ANSYS. 2) the modal analysis of the open / closed steel box-concrete composite bridge space model is carried out. At the same time, the influence of these parameters on the natural vibration characteristics of the bridge structure is discussed by changing the parameters such as the spacing of the transverse diaphragm, the thickness of the transverse diaphragm and the web, and the natural vibration frequency and vibration pattern of the open / closed steel box-concrete composite bridge are compared. The results show that the steel box-concrete composite bridge is a medium flexible structure. 3) the seismic response of the open / closed steel box-concrete composite bridge structure is analyzed. The seismic responses of different seismic waves to open / closed steel box-concrete composite bridge structures are studied by time-history analysis method. The results of linear time-history analysis and nonlinear time-history analysis of structures are compared, and the openings are compared. The seismic response of closed steel box-concrete composite bridge under the same seismic wave is obtained. The results show that the torsional stiffness of the open steel box-concrete composite bridge is lower. 4) through the analysis of the natural vibration characteristics and seismic response of the structure, It is concluded that the appropriate spacing arrangement of the transverse spacer can increase the torsional stiffness of the structure under the premise of satisfying the bearing capacity requirements. These conclusions will provide theoretical basis and reference for the design and engineering application of this kind of structure in the future.
【學(xué)位授予單位】:西安建筑科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U442.55
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