铅芯橡胶支座对桥梁减震效果的研究

发布时间：2018-05-31 03:50

本文选题：铅芯橡胶支座 + 减震　；参考：《西南交通大学》2017年硕士论文

【摘要】：地震对铁路公路桥梁造成的破坏十分严重,桥梁先进的抗震设计理论和有效减震技术愈显重要。铅芯橡胶支座兼有隔震器和阻尼器的结构特点,具有工程造价低、施工方便、材料易得和力学性能稳定等优点,在工程领域被广泛研究和应用。为了研究铅芯橡胶支座的减震性能,本文开展了以下几方面的研究工作:(1)介绍了铅芯橡胶支座耗能原理与桥梁结构动力学分析方法,基于桥梁结构动力平衡方程,通过小变形理论、平截面假定及位移边界条件推导出了梁的单元质量矩阵、单元刚度矩阵、单元阻尼矩阵。(2)以实际桥梁为工程算例,利用ANSYS软件建立了铅芯橡胶支座的有限元模型,研究了铅芯橡胶支座的滞回特性。(3)建立了板式橡胶支座和采用铅芯橡胶支座的桥梁模型,分析不同支座桥梁模型的模态参数,计算结果表明,采用铅芯橡胶支座桥梁的模态频率较小。(4)采用宁河天津波,通过对两种不同支座桥梁的地震时程分析,分析得出梁体及桥墩的位移时程曲线、应力时程曲线和基础反力时程曲线,并计算支座的减震率。计算结果表明,铅芯橡胶支座的隔震效果明显。(5)研究了桥墩高度对减震效果的影响。结果表明,随着桥墩高度的增加,铅芯橡胶支座的减震效果降低。
[Abstract]:The damage caused by earthquake to railway bridges is very serious. The advanced seismic design theory and effective damping technology of bridges are more and more important. Lead rubber bearing has the structural characteristics of both shock isolators and dampers. It has the advantages of low engineering cost, easy construction, easy material availability and stable mechanical properties, and has been widely studied and applied in engineering field. In order to study the vibration absorption performance of lead rubber bearing, the following research work is carried out in this paper. The principle of energy dissipation of lead rubber bearing and the dynamic analysis method of bridge structure are introduced in this paper, based on the dynamic balance equation of bridge structure. Based on the theory of small deformation, the assumption of plane section and the displacement boundary condition, the element mass matrix, element stiffness matrix and element damping matrix of the beam are derived. The finite element model of lead rubber bearing is established by using ANSYS software. The hysteretic characteristic of lead rubber bearing is studied. The bridge models of plate rubber bearing and lead rubber bearing are established, and the modal parameters of different bearing bridge models are analyzed. The calculated results show that the modal frequency of the lead-rubber bearing bridge is smaller. (4) using the Tianjin wave of Ninghe River, the displacement time history curves of beam and pier are obtained by analyzing the seismic time history of two different kinds of supported bridges. The stress time history curve and the foundation reaction history curve are used to calculate the shock absorption rate of the bearing. The results show that the vibration isolation effect of lead rubber bearing is obvious. The results show that the damping effect of lead rubber bearing decreases with the increase of pier height.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U443.36

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