曲线连续箱梁桥动力计算及减隔震设施分析

发布时间：2018-01-12 10:34

本文关键词：曲线连续箱梁桥动力计算及减隔震设施分析　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：曲线桥梁因其线型布置灵活、造型优美而被广泛用于城市立交工程，，但在近年来的破坏性较大的地震中，曲线连续梁桥仍出现了不同程度的破坏，对曲线连续箱梁桥的地震反应规律和减隔震设施进行研究具有一定的急迫性。本文以两跨曲线连续箱梁桥为对象研究，对曲线箱梁桥动力响应及减隔震设施进行了分析，研究内容如下： 1.分析桥梁结构的震害及在震害中得到的启示，讨论了减隔震技术的机理，详细的论述了如何准确的建立有限元分析模型，及在有限元分析模型件中如何准确的考虑支座及桩土结构相互作用等。 2.研究了曲率半径及是否考虑桩土作用对振动特性的影响，在考虑桩土相互作用分析时必须要截取更多阶数的振型使计算的结果更准确，并且考虑桩土相互作用与否，对结构低阶振形变化没有明显影响。 3.不同方向地震波激励下城市曲线桥的地震响应差别非常大，对不同曲率半径的有限元模型进行了单向反应谱激励分析，激励方向0~180°增量10°输入。通过对比验证了该方法的有效性，并且得到不同曲率半径下反应谱分析的一般规律。 4.对铅芯橡胶支座和高阻尼橡胶支座建立了力学模型和模拟计算，分了两种支座的隔震性能，通过对比得出高阻尼橡胶支座比铅芯橡胶隔震性能要好的结论，并比较了不同的剪切模量对隔震性能的影响。 5.针对挡块在有限元软件中的模拟，分析了不同类型的挡块对桥梁隔震的影响，并且比较了不同挡块间隙对隔震的影响，并提出了对减隔震抗震设计的建议。
[Abstract]:Curved bridges are widely used in urban interchange engineering because of their flexible layout and graceful shape. However, in recent years, in the destructive earthquake, curved continuous beam bridges still have different degrees of damage. It is urgent to study the seismic response and isolation facilities of curved continuous box girder bridges. In this paper, the dynamic response and isolation facilities of curved continuous box girder bridge are analyzed. The research contents are as follows: 1. Analyze the earthquake damage of bridge structure and the inspiration obtained in the earthquake disaster, discuss the mechanism of isolation technology, and discuss in detail how to establish the finite element analysis model accurately. And how to consider the bearing and pile-soil structure interaction accurately in the finite element analysis model. 2. The radius of curvature and the effect of pile-soil action on vibration characteristics are studied. In the analysis of pile-soil interaction, more order vibration modes must be intercepted to make the results more accurate. Considering the pile-soil interaction or not, there is no obvious effect on the low order vibration of the structure. 3. The seismic response of urban curved bridge under different direction seismic wave excitation is very different. The unidirectional response spectrum excitation analysis of the finite element model with different curvature radius is carried out. The excitation direction is 0 ~ 180 掳increment 10 掳input. The validity of the method is verified by comparison, and the general law of response spectrum analysis under different curvature radii is obtained. 4. The mechanical model and simulation calculation of the lead rubber bearing and the high damping rubber bearing are established, and the isolation performance of the two kinds of bearings is divided. It is concluded that the high damping rubber bearing is better than lead rubber in isolation performance, and the effect of different shear modulus on isolation performance is compared. 5. According to the simulation of the block in the finite element software, the influence of different types of block on the isolation of bridge is analyzed, and the influence of different block gap on isolation is compared. Suggestions for seismic design of seismic isolation are also put forward.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.213;U442.55

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