铁路四线重载钢桁梁斜拉桥静动力分析研究

发布时间：2018-06-20 02:03

本文选题：四线重载 + 钢桁斜拉桥　；参考：《西南交通大学》2015年硕士论文

【摘要】：随着国家高铁网建设步伐的加快,斜拉桥成为跨越江河峡谷的合理选择。斜拉桥作为一种柔性结构如何适应铁路活载大的特点从而保证列车运行安全性与平稳性成为日益重要的研究课题。论文以国内某四线高速铁路重载钢桁梁斜拉桥为背景,此桥是国内首座采用两片主桁的四线大跨度宽桁铁路斜拉桥。论文结合设计进行静力分析与动力分析,主要对结构受力特性、静活载作用下的结构受力与变形情况、结构自振特性和地震荷载作用下的结构响应及静风荷载、列车荷载作用下结构的稳定性进行相关研究。研究内容主要包括以下几个方面：(1)运用计算软件Midas Civil 2012建立基于梁单元、索单元和板单元的全桥三维有限元模型；计算分析桥梁施工阶段的受力和变形,分析中考虑混凝土收缩徐变因素的影响。(2)计算分析四线铁路活载、风荷载、温度荷载与基础不均匀沉降等各单独工况与不同组合工况作用下桥塔、钢主梁和拉索受力状况,提出优化构件受力状态的建议。(3)利用子空问迭代法计算结构自振特性,运用反应谱和时程分析两种方法对结构进行地震响应计算分析；(4)计算分析施工阶段和运营阶段桥梁的弹性稳定性,得出了桥梁从施工到运营阶段桥梁结构稳定性均满足要求的结论。
[Abstract]:With the acceleration of national high-speed rail network construction, cable-stayed bridges become a reasonable choice across river canyons. As a flexible structure, cable-stayed bridge has become an increasingly important research topic how to adapt to the characteristics of large live load of railway and ensure the safety and stability of train operation. In this paper, a four-line high speed railway heavy load steel truss cable-stayed bridge is taken as the background. This bridge is the first four-line large-span girder cable-stayed bridge with two main trusses in our country. Based on the static and dynamic analysis of the design, this paper mainly deals with the structural stress characteristics, the structure stress and deformation under the static and live load, the structure natural vibration characteristics and the structural response and static wind load under the earthquake load. The stability of the structure under train load is studied. The main contents of the research include the following aspects: 1) using the software Midas Civil 2012 to establish the 3D finite element model of the whole bridge based on the beam element, cable element and plate element, and to calculate and analyze the force and deformation of the bridge during the construction stage. In the analysis, considering the influence of concrete shrinkage and creep factors, the calculation and analysis of the stress condition of bridge tower, steel main beam and cable under the action of single working condition, wind load, temperature load and uneven settlement of foundation, etc. The suggestion of optimizing the stress state of the structure is put forward. The subspace iterative method is used to calculate the natural vibration characteristics of the structure, and the response spectrum and time history analysis are used to calculate and analyze the seismic response of the structure. Finally, the elastic stability of the bridge in the construction and operation stages is analyzed, and the conclusion is drawn that the stability of the bridge structure meets the requirements from the construction stage to the operation stage.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27

【参考文献】