高速铁路桥梁盆式橡胶支座承载力有限元分析

发布时间：2019-03-21 06:37

【摘要】：桥梁支座是桥梁结构中的关键组成部分,能将桥梁上部结构的反力可靠地传递给桥梁下部结构,近些年盆式橡胶支座大量应用于高速铁路桥梁上。我国是一个地震频发的国家,历次地震中支座的破坏现象十分普遍,因此对高速铁路32m简支箱梁桥KTPZ系列盆式橡胶支座进行竖向承载力和水平抗剪能力分析很有必要。本文通过ANSYS有限元数值模拟和基于弹性力学和材料力学相关的理论计算相结合,分别对盆式橡胶支座的竖向承载力和水平抗剪能力进行了计算和对比分析,对盆式橡胶支座进行了尺寸优化。本文的主要内容包括以下几个方面:(1)结合国内外有关盆式橡胶支座的文献和研究报告,介绍了盆式橡胶支座承载力研究的背景和意义,以及相关研究的国内外动态和目前存在的问题。(2)根据高速铁路32m简支箱梁桥KTPZ系列盆式橡胶支座的特点和现有的国内外盆式橡胶支座设计规范,建立盆式橡胶支座三维ANSYS有限元模型;根据盆式橡胶支座传力机理,设置接触面并合理设置橡胶材料超弹参数。(3)通过三维ANSYS有限元数值模拟,进行盆式橡胶支座的竖向极限承载力分析。通过基于弹性力学拉密公式的理论计算得出盆式橡胶支座的竖向极限承载力。结果表明,有限元数值模拟结果和理论计算结果基本一致;数值模拟结果与铁道科学研究院盆式橡胶支座竖向极限承载力试验结果基本吻合。对比结果证明了三维ANSYS有限元数值模拟方法的合理性。(4)采用三维ANSYS有限元分析,分别进行了盆式橡胶支座本体的水平极限承载力和锚栓抗剪承载力的分析,并与基于材料力学第三强度理论计算结果进行了比较。结果表明,盆式橡胶支座水平承载力由螺栓的抗剪强度控制,理论计算和数值模拟得出的计算结果基本一致。(5)基于竖向承载力作用下不同尺寸盆式橡胶支座盆底应力曲线,分别对盆式橡胶支座的三个参数:橡胶厚度、底板厚度和盆环厚度进行尺寸优化。结果表明可以保证在承载力不变的情况下降低盆式橡胶支座的生产成本。
[Abstract]:Bridge support is the key component of bridge structure, which can reliably transfer the reaction force of bridge superstructure to the bridge substructure. In recent years, basin rubber bearing has been widely used in high-speed railway bridges. China is a country with frequent earthquakes, and the failure of bearings in previous earthquakes is very common. Therefore, it is necessary to analyze the vertical bearing capacity and horizontal shear capacity of KTPZ series basin rubber bearings of 32m simply supported box girder bridge in high-speed railway. In this paper, the vertical bearing capacity and horizontal shear capacity of basin rubber bearing are calculated and compared by ANSYS finite element simulation and theoretical calculation based on elastic mechanics and material mechanics, respectively. The size of the basin rubber bearing is optimized. The main contents of this paper include the following aspects: (1) the background and significance of the research on the bearing capacity of the basin rubber bearing are introduced based on the literature and research reports of the basin type rubber bearing at home and abroad. (2) according to the characteristics of KTPZ series basin rubber bearing of 32m simply supported box girder bridge on high-speed railway and the existing design code of basin rubber bearing at home and abroad, The three-dimensional ANSYS finite element model of basin rubber bearing was established. According to the mechanism of force transfer of basin rubber bearing, the contact surface is set and the hyperelastic parameters of rubber material are reasonably set. (3) the vertical ultimate bearing capacity of basin rubber bearing is analyzed by three-dimensional ANSYS finite element numerical simulation. The vertical ultimate bearing capacity of the basin rubber bearing is obtained by theoretical calculation based on the elastic compacting formula. The results show that the finite element numerical simulation results are basically consistent with the theoretical results, and the numerical simulation results are in good agreement with the experimental results of the vertical ultimate bearing capacity of the basin rubber bearings of the Railway Science Research Institute. The comparison results show that the three-dimensional ANSYS finite element numerical simulation method is reasonable. (4) the horizontal ultimate bearing capacity and the Anchorage shear capacity of the basin rubber bearing are analyzed by using the three-dimensional ANSYS finite element analysis. The results are compared with those calculated based on the third strength theory of material mechanics. The results show that the horizontal bearing capacity of the basin rubber bearing is controlled by the shear strength of the bolt. The results obtained by theoretical calculation and numerical simulation are basically consistent. (5) based on the stress curve of basin floor of different sizes of basin rubber bearing under the action of vertical bearing capacity, the three parameters of basin type rubber bearing: rubber thickness, The thickness of the bottom plate and the thickness of the ring are optimized. The results show that the production cost of basin rubber bearing can be reduced without any change in bearing capacity.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U443.361

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