考虑竖向地震力下桥墩的抗震性能研究

发布时间：2018-01-10 17:13

本文关键词：考虑竖向地震力下桥墩的抗震性能研究　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：许多的地震灾害现象用水平地震对结构破坏起控制作用的传统观点无法解释,国内对于竖向地震力的研究目前主要是针对多层建筑和烟囱结构,而桥墩与多层建筑中的框架柱、烟囱等一样属于细长结构,并且桥墩是在地震作用下易发生破坏的重要构件,因此有必要对桥墩在考虑竖向地震力下的抗震性能进行研究分析。简述了桥梁抗震计算分析方法,整理、对比了多个桥墩抗剪强度计算公式,得出的结论是与其他计算公式相比,经与试验结果相比较证明,Priestley公式计算的抗剪强度与桥墩的实际抗剪强度更符合。本文基于有限元分析软件Midas Civil建立单柱墩模型,对桥墩塑性铰区域进行纤维划分,采用非线性动力时程方法进行计算,研究了在不同轴压比、长细比以及地震波作用下桥墩的墩顶位移和墩底抗剪强度,得到不同轴压比、长细比以及地震波下考虑竖向地震力对结构抗震性能造成的影响。通过建立简支梁桥、连续梁桥、连续刚构桥三个全桥模型,研究了竖向地震力对不同桥梁结构形式桥墩抗震性能造成的影响。通过对不同影响因素下考虑竖向地震力前后桥墩的抗震性能进行对比分析,得到了一些结论,竖向地震力对桥墩抗震性能的影响主要是在于对桥墩抗剪强度的削弱,而对墩顶位移的影响较小。
[Abstract]:Many of the earthquake disaster phenomena with the traditional view of the role of horizontal earthquake damage control structure cannot explain the domestic study on the vertical seismic force is mainly aimed at the multi-storey buildings and chimney structure, and the pier and the multi-storey building frame column, such as fine long chimney belongs to the structure, and the pier is an important component of failure occurs at under the action of earthquake, so it is necessary to analyze the seismic performance of the pier considering vertical seismic force. The bridge seismic analysis method, sorting, comparing the pier shear strength formula, the conclusion is compared with other calculation formula, by comparing with the experimental results show that the Priestley formula the calculation of the shear strength and the shear strength of the pier is more in line with the actual. In this paper, the finite element analysis software Midas Civil based on the model of single pier, pier on the plastic hinge region Fiber divided by the nonlinear time history method to calculate, studied under different axial compression ratio, slenderness ratio of pier under seismic waves and displacement of pier top and bottom of the pier shear strength, different axial compression ratio, slenderness ratio and the effect of seismic wave under vertical seismic force caused by seismic structure performance. Through the establishment of a simple supported beam bridge, continuous beam bridge, continuous rigid frame bridge with three full bridge model, studied the impact of vertical earthquake on the seismic performance of the bridge structure form different piers. Considering the comparative analysis of seismic performance of bridge piers and the vertical seismic force by different factors on the influence, some conclusions were obtained, the effect of vertical the seismic force on the pier seismic performance mainly depends on the shearing strength of the pier weakened, but little influence on the displacement of the pier top.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U443.22

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