异形拱桥动力特性与稳定性研究
发布时间：2019-03-14 10:18
【摘要】：异形拱桥由于结构造型新颖,外形优美,在中小跨度桥梁特别是城市桥梁中应用较多。但异形拱桥结构受力复杂,其结构动力特性和稳定性是桥梁设计和施工较为关心的问题。本文以常德柳叶湖异形拱桥为工程背景,对该桥动力特性及稳定性进行了分析和对比,并开展了参数研究,主要工作和结论如下:介绍了拱桥的结构特点和发展历史,对依托工程进行了介绍。阐述了结构动力特性分析和稳定性分析的基本原理和方法。基于ANSYS有限元分析软件建立了柳叶湖异形拱桥全桥有限元计算模型,获得了大桥前10阶频率和振型,并将计算结果与MIDAS CIVIL的全桥动力特性分析结果进行了对比,结果的一致性表明了计算分析的可靠性。动力特性分析显示,大桥第一阶模态为主拱横桥向整体侧弯,频率明显低于主拱和主梁竖弯模态频率,表明大桥主拱刚度最小。分析同时表明,大桥扭转模态出现较早,可能与主梁梁高小、高宽比小有关。基于建立的柳叶湖异形拱桥全桥有限元计算模型,在ANSYS和MIDAS CIVIL中分别开展了全桥稳定性分析,获得了大桥前5阶失稳模态,两款有限元分析软件获得的结果差别小。计算获得的第一阶屈曲模态特征值为29.4,表现为主拱横桥向侧弯,说明该桥最先发生的失稳为主拱侧弯,这也再次表明大桥主拱侧向刚度最小,但由于该失稳模态对应的特征值明显大于工程经验认可值,因而柳叶湖大桥全桥稳定性是有保障的。选取多个有重要影响的结构参数,获得了这些结构参数变化下柳叶湖异形拱桥全桥动力特性和稳定性计算结果,分析了不同参数的影响程度,突出了有重要影响的结构参数。本文开展的相关动力特性和稳定性有限元研究结果,为柳叶湖异形拱桥的设计和建造提供了重要的参考。
[Abstract]:Special-shaped arch bridge is widely used in small and medium span bridges, especially in urban bridges because of its novel structure and beautiful shape. However, the structural dynamic characteristics and stability of the special-shaped arch bridge are of great concern in the design and construction of the bridge. Based on the engineering background of Changde Liuye Lake special-shaped arch bridge, the dynamic characteristics and stability of the bridge are analyzed and compared, and the parameters are studied. The main work and conclusions are as follows: the structural characteristics and development history of the arch bridge are introduced. This paper introduces the project relying on it. The basic principle and method of structural dynamic characteristic analysis and stability analysis are described. Based on the finite element analysis software ANSYS, the finite element calculation model of Liuye Lake special-shaped arch bridge is established. The first 10 order frequencies and mode shapes of the bridge are obtained, and the calculated results are compared with the results of MIDAS CIVIL's full bridge dynamic analysis. The consistency of the results shows the reliability of the calculation and analysis. The dynamic characteristic analysis shows that the first mode of the bridge is the lateral bending of the main arch and the frequency is obviously lower than the vertical bending modal frequencies of the main arch and the main beam, indicating that the stiffness of the main arch of the bridge is the smallest. The analysis also shows that the torsional mode of the bridge appears earlier, which may be related to the small height and the ratio of height to width of the main beam. Based on the established finite element calculation model of Liuye Lake special-shaped arch bridge, the stability analysis of the whole bridge is carried out in ANSYS and MIDAS CIVIL respectively, and the five-order unstable modes in front of the bridge are obtained. The difference between the results obtained by the two finite element analysis software is small. The calculated eigenvalues of the first-order buckling modes are 29.4, which shows that the lateral bending of the main arch appears in the transverse direction of the main arch, which indicates that the first instability of the bridge occurs in the lateral bending of the main arch, which also indicates that the lateral stiffness of the main arch of the bridge is the smallest. However, the stability of the Liuye Lake Bridge is guaranteed because the characteristic value corresponding to the instability mode is obviously larger than the approved value of the engineering experience. The dynamic characteristics and stability calculation results of the Liuye Lake special-shaped arch bridge under the variation of these structural parameters are obtained. The influence degree of different parameters is analyzed and the important structural parameters are highlighted. The research results of the dynamic characteristics and stability of this paper provide an important reference for the design and construction of the Liuye Lake special-shaped arch bridge.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.22
本文编号：2439893
[Abstract]:Special-shaped arch bridge is widely used in small and medium span bridges, especially in urban bridges because of its novel structure and beautiful shape. However, the structural dynamic characteristics and stability of the special-shaped arch bridge are of great concern in the design and construction of the bridge. Based on the engineering background of Changde Liuye Lake special-shaped arch bridge, the dynamic characteristics and stability of the bridge are analyzed and compared, and the parameters are studied. The main work and conclusions are as follows: the structural characteristics and development history of the arch bridge are introduced. This paper introduces the project relying on it. The basic principle and method of structural dynamic characteristic analysis and stability analysis are described. Based on the finite element analysis software ANSYS, the finite element calculation model of Liuye Lake special-shaped arch bridge is established. The first 10 order frequencies and mode shapes of the bridge are obtained, and the calculated results are compared with the results of MIDAS CIVIL's full bridge dynamic analysis. The consistency of the results shows the reliability of the calculation and analysis. The dynamic characteristic analysis shows that the first mode of the bridge is the lateral bending of the main arch and the frequency is obviously lower than the vertical bending modal frequencies of the main arch and the main beam, indicating that the stiffness of the main arch of the bridge is the smallest. The analysis also shows that the torsional mode of the bridge appears earlier, which may be related to the small height and the ratio of height to width of the main beam. Based on the established finite element calculation model of Liuye Lake special-shaped arch bridge, the stability analysis of the whole bridge is carried out in ANSYS and MIDAS CIVIL respectively, and the five-order unstable modes in front of the bridge are obtained. The difference between the results obtained by the two finite element analysis software is small. The calculated eigenvalues of the first-order buckling modes are 29.4, which shows that the lateral bending of the main arch appears in the transverse direction of the main arch, which indicates that the first instability of the bridge occurs in the lateral bending of the main arch, which also indicates that the lateral stiffness of the main arch of the bridge is the smallest. However, the stability of the Liuye Lake Bridge is guaranteed because the characteristic value corresponding to the instability mode is obviously larger than the approved value of the engineering experience. The dynamic characteristics and stability calculation results of the Liuye Lake special-shaped arch bridge under the variation of these structural parameters are obtained. The influence degree of different parameters is analyzed and the important structural parameters are highlighted. The research results of the dynamic characteristics and stability of this paper provide an important reference for the design and construction of the Liuye Lake special-shaped arch bridge.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.22
【参考文献】
相关期刊论文 前1条
1 丁大钧;我国拱桥建设屡创辉煌[J];桥梁建设;2000年01期
相关博士学位论文 前1条
1 康厚军;索拱结构的稳定与振动研究[D];湖南大学;2007年
相关硕士学位论文 前2条
1 冯文焕;桥梁结构动力特性研究[D];长安大学;2013年
2 孟杰;系杆拱桥结构体系研究[D];湖南大学;2002年
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