钢箱—混凝土组合桥梁结构地震响应分析

发布时间：2018-12-12 20:47

【摘要】：钢箱-混凝土组合桥梁结构上部由钢筋混凝土桥面板与下部钢箱梁组成。由于下部结构采用钢箱梁的形式,很好地取代了原来桥梁结构中普遍使用的预应力钢筋混凝土小箱梁,能够很大程度上减轻结构的自重,从而实现桥梁结构在大跨径桥梁中的应用。近年来桥梁的抗震性能研究一直备受关注,本文将在已有的研究成果基础上探讨了开口/闭口钢箱-混凝土组合桥梁地震响应规律。本文主要研究内容如下:1)本文结合某实际工程对实体结构进行简化,并运用有限元软件ANSYS分别建立了开口/闭口钢箱-混凝土组合桥梁空间有限元模型。2)对开口/闭口钢箱-混凝土组合桥梁空间模型进行了模态分析,同时改变横隔板的间距与横隔板、腹板厚度等参数,探讨了这些参数对桥梁结构自振特性的影响,并对比了开口/闭口钢箱-混凝土组合桥梁的自振频率与振型,结果表明钢箱-混凝土组合桥梁为中等柔性结构。3)对开口/闭口钢箱-混凝土组合桥梁结构进行了地震响应分析,运用时程分析法研究了不同地震波对开口/闭口钢箱-混凝土组合桥梁结构的地震响应,同时对比研究了结构线性时程分析和非线性时程分析结果,并比较了开口、闭口钢箱-混凝土组合桥梁在同一地震波下的地震响应,结果表明开口钢箱-混凝土组合桥梁的抗扭刚度较低。4)通过对结构的自振特性及地震响应分析,得出了在满足承载力要求的前提下横隔板适当间距布置能够增加结构的抗扭刚度,这些结论将为今后该类结构的设计和工程应用提供理论依据和参考。
[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.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55

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