大跨度高速铁路系杆拱桥动力特性及抗震性分析

发布时间：2018-05-20 15:37

本文选题：钢管混凝土系杆拱桥 + 动力特性　；参考：《合肥工业大学》2014年硕士论文

【摘要】：钢管混凝土系杆拱桥由于承载能力高、跨越能力强、抗震性能好、施工方便、结构美观等优点而被广泛的应用于实际工程项目当中，但是钢管混凝土系杆拱桥的动力特性和抗震分析的研究相对其他类型的桥梁而言还特别少。近年来，我国的地震处于高频发生期，常使桥梁结构发生破坏，造成交通中断，延缓抗震救灾，从而导致次生灾害加重，进一步加重了地震灾情。因此研究钢管混凝土系杆拱桥的动力特性和抗震性分析是非常必要的，以便深入了解其动力特性与地震反应特性，为桥梁抗震设计与分析提供科学的依据。本文以合福高铁跨越合肥市金寨路的大跨度下承式钢管混凝土系杆拱桥为研究对象，利用大型有限元软件Midas/Civil对该桥的动力特性及地震响应进行计算分析，主要做了如下内容： 1、介绍了钢管混凝土结构的发展及特点、系杆拱桥的特性、桥梁结构的抗震分析方法、桥梁的地震破坏类型以及钢管混凝土拱桥的抗震研究现状。 2、阐述了结构抗震动力学基本概念、结构的抗震设防目标、桥梁的延性抗震设计、基于性能的桥梁抗震设计的基本理论。 3、介绍了该桥的工程概况，有限元模型的建立，分析了该桥的静动力特性，以及在各阶振型下的振动特征。 4、介绍了反应谱法的概况、基本原理和使用条件，对该桥进行了有列车荷载和无列车荷载下的反应谱地震响应分析，得出了该桥主拱肋、桥墩、系梁等在地震作用下的响应。 5、介绍了动态时程法的概况、基本原理和使用条件，，对该桥进行了动态时程地震响应分析，得出了该桥主拱肋、桥墩、系梁等在地震响应下的内力及位移值及其随时间的变化规律，通过有列车和无列车两种情况对比，计算高速列车荷载对地震响应的影响。 6、将地震反应谱分析法和地震动力时程分析法的结果相比较,得出两种地震方法的各自特点。 7、对全文进行了归纳总结，介绍了本论文中的一些不足之处以及以后需要研究的方向。
[Abstract]:Concrete-filled steel tubular tied arch bridge is widely used in practical projects because of its high bearing capacity, strong span capacity, good seismic performance, convenient construction and beautiful structure. However, the dynamic characteristics and seismic analysis of concrete-filled steel tubular tied arch bridges are less than other types of bridges. In recent years, the earthquakes in our country are in the period of high frequency occurrence, which often cause damage to the bridge structure, cause traffic interruption, delay the earthquake relief, and lead to the aggravation of secondary disasters, which further aggravate the earthquake disaster situation. Therefore, it is necessary to study the dynamic and seismic characteristics of concrete-filled steel tubular tied arch bridge in order to deeply understand its dynamic characteristics and seismic response characteristics, and to provide a scientific basis for the seismic design and analysis of bridges. In this paper, the long-span through concrete filled steel tube tied arch bridge crossing Jinzhai Road in Hefei City is taken as the research object. The dynamic characteristics and seismic response of the bridge are calculated and analyzed by using the large-scale finite element software Midas/Civil. The main contents are as follows: 1. The development and characteristics of concrete-filled steel tubular (CFST) structures, the characteristics of tied arch bridges, the seismic analysis methods of bridge structures, the types of seismic damage of bridges and the present situation of seismic research of CFST arch bridges are introduced. 2. The basic concept of aseismic dynamics, the seismic fortification target, the ductile seismic design of bridges and the basic theory of performance-based seismic design of bridges are expounded. 3. The general situation of the bridge, the establishment of the finite element model, the static and dynamic characteristics of the bridge and the vibration characteristics of the bridge under various vibration modes are introduced. 4. The general situation, basic principle and application conditions of the response spectrum method are introduced. The response spectrum seismic response of the bridge under train load and no train load is analyzed, and the responses of the main arch rib, pier and tie beam of the bridge under earthquake action are obtained. 5. The general situation, basic principle and application conditions of dynamic time-history method are introduced. The dynamic time-history seismic response of the bridge is analyzed, and the main arch ribs and piers of the bridge are obtained. The internal forces and displacements of the girders under earthquake response and their variation law with time are calculated. The effects of high-speed train loads on the seismic response are calculated by comparing the train with and without trains. 6. The results of seismic response spectrum analysis and seismic dynamic time history analysis are compared, and the respective characteristics of the two methods are obtained. 7. This paper summarizes the whole paper, introduces some shortcomings in this paper and the direction to be studied in the future.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.225

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