【作者】 龚德华；

【导师】 赵人达；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2008， 硕士

【摘要】 斜拉桥是由塔、梁、索三种基本构件组成的高次超静定柔性结构体系。甬江斜拉桥桥塔采用双塔联体结构,是一种复杂的新型结构形式,本文较系统地研究了这种新型结构形式的结构特点、静力性能、动力特性以及抗震性能,旨在对这种结构从概念上有更深刻的认识,为设计提供依据,并为进一步的研究工作打下基础。本文对有限元分析方法的基本原理进行了阐述,简要分析了对桥梁结构进行分析的有限元方法及有限元软件,并应用Midas软件建立了双塔联体结构的计算模型,双塔联体结构的静力特性、动力特性和抗震分析时均采用了此模型。本文利用Midas进行了甬江大桥桥塔在指定工况下的静力分析,在动力特性方面,把双塔联体结构同一般双塔结构的动力特性作了比较,主要是振动的基频和振型分析,然后对双塔联体结构进行了地震响应分析,深入研究了其在水平地震作用下的受力变形特点,为甬江大桥抗震研究提供依据。本文通过计算,分析得到了一些双塔联体结构基本特性的规律,对工程设计及后续研究有一定的参考价值。更多还原

【Abstract】 The cable-stayed bridge is a kind of indeterminate flexible structure with many redundant degrees of freedom, which consists of three basic members: towers, girders and cables. The tower of Yongjiang river cable-stayed bridge is the Double-Tower-Connected Structure that is a new complex structure system. Studies on structural behaviors including static behaviors, dynamic characteristics and seismic responses of the Double-Tower-Connected Structures are given systematically in this thesis, which could help to a deeper understanding of the basic conception for the Double-Tower-Connected Structures. And the thesis also establishes a foundation for further researches and provides a reasonable design guideline.The basic element of finite element method, especially the bridge static analysis of finite element method is expatiated, and the finite element method software for bridge analysis is researched. A structure computation model for analyzing the Double-Tower-Connected Structures system has been founded based on software MIDAS, and the presented model is applied to study the static behaviors, dynamic characteristics and seismic responses of the Double-Tower-Connected Structures. The static behaviors of the Yongjiang river cable-stayed bridge has been analyzed with finite element program MIDAS under specified loads. And in the matter of dynamic analysis, the dynamic characteristics have been compared between the double-tower and the Double-Tower-Connected Structures, including the basic frequency and vibration modes. And then the seismic response analysis of Double-Tower-Connected Structures is carried out. The mechanical characteristic and the deformation behavior of this structure subjected to seismic action are analyzed deeply. The study is able to provide reliable evaluations for bridge design to bear earthquake.After calculation in this thesis, some conclusions on characteristics of Double-Tower-Connected Structures are summarized, which are useful for project design and further researches.更多还原