基于ANSYS的大跨度连续刚构桥近场地震反应分析与研究

发布时间：2018-10-14 20:20

【摘要】：伴随着我国经济的增长,交通的便利性显得越来越重要,尤其是近些年来西部大开发的深入,高速公路设施在崇山峻岭间修建的必要性越来越急迫,所以桥梁连续刚构桥就成为选择对象之一。目前连续刚构桥以其跨越能力大、经济性较好等优势广泛运用于公路、城市桥梁,特别是高速公路进入山区后更是成为了跨越沟谷最常见的大跨度桥梁。连续刚构桥的梁体为连续与桥墩刚接,桥墩参与受弯变形,提高了桥梁的整体性,使车辆行驶更加安全。针对上述情况,对于研究其地震作用下的动力特性,抗震设计的分析显得尤为重要和迫切。结合上述内容,本文研究的主要工作有:第一,对地震的成因、地震波以及地震的危害做了详细说明,着重介绍了近场地震,由此说明高墩连续刚构桥受近场地震作用影响研究的必要性;第二,简述了国内外高墩连续刚构桥规范及工程应用研究领域的进展,抗震方法研究的进展。然后又介绍了抗震设计方法研究的进展,以国内某连续刚构桥为例,借助于有限元分析软件ANSYS建立了桥两端分别为一般简支约束和弹簧简支约束两种实体桥梁模型;第三,先对两端简支约束的模型进行静力分析验证结构设计的合理性,再分别基于ANSYS对两种模型进行模态分析。然后用反应谱法和时程分析法对模型进行多维地震反映分析,得出桥梁的动力响应数据;第四,研究分析了两种结构模型在多维地震作用下的动力响应差异,初步得出了高墩连续刚构桥部分约束的改变能够对桥梁整体抗震性能做出贡献的结论,为同类型桥梁结构的抗震设计和分析研究提供借鉴与参考。
[Abstract]:With the economic growth of our country, the convenience of transportation is becoming more and more important, especially with the development of the western region in recent years, the necessity of building expressway facilities between the mountains and mountains is becoming more and more urgent. So the continuous rigid frame bridge becomes one of the selected objects. At present, continuous rigid frame bridge is widely used in highway because of its advantages of large span ability and good economy. Urban bridges, especially expressway, have become the most common long-span bridge crossing gully after entering mountain area. The beam body of the continuous rigid frame bridge is connected with the bridge pier, and the bridge pier takes part in the bending deformation, which improves the integrity of the bridge and makes the vehicle run more safely. In view of the above situation, the analysis of seismic design is particularly important and urgent for studying its dynamic characteristics under earthquake action. Combined with the above contents, the main work of this paper is as follows: first, the causes of earthquakes, seismic waves and the hazards of earthquakes are explained in detail, and the near field earthquakes are emphatically introduced. Therefore, it is necessary to study the effect of near-field earthquake on continuous rigid frame bridges with high piers. Secondly, the research progress in the field of code and engineering application of continuous rigid frame bridges with high piers and the research progress of seismic methods at home and abroad are briefly described. Then the research progress of seismic design method is introduced. Taking a continuous rigid frame bridge in China as an example, two kinds of solid bridge models are established with the help of finite element analysis software ANSYS. The static analysis of the two simply supported models is carried out to verify the rationality of the structural design, and then the modal analysis of the two models is carried out based on ANSYS. Then the response spectrum method and time history analysis method are used to analyze the multi-dimensional seismic response of the model, and the dynamic response data of the bridge are obtained. Fourthly, the difference of the dynamic response of the two structural models under the action of multi-dimensional earthquake is studied and analyzed. The conclusion that the change of partial constraints of continuous rigid frame bridges with high piers can contribute to the overall seismic performance of the bridge provides a reference for the seismic design and analysis of the same type of bridge structures.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.23;U442.55

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