辅助墩对独塔斜拉桥力学性能影响

发布时间：2018-09-03 15:32

【摘要】：斜拉桥是一种特殊结构的桥梁，其特殊之处就是在于可以给定一个拉索的初拉力，这个初拉力可以改变整个斜拉桥结构体系的内力和变形以及各个部件的受力，但是影响斜拉桥内力的因素还有很多，例如加设辅助墩。对于斜拉桥这种大跨度的超静定结构体系，在恒荷载和活荷载作用下，结构体系受力很大；在地震、台风以及车辆移动荷载等动力作用下，，动力反应比较敏感，所以研究斜拉桥在有无辅助墩条件下的静力以及动力反应是很有必要的。本文以飞云江三桥为论文研究背景，通过改变该独塔斜拉桥有无辅助墩条件下两种不同的结构体系，利用有限元软件Midas/civil2010建立两种体系模型，系统分析了辅助墩对独塔斜拉桥的静力、动力以及地震响应影响问题。本文的主要工作内容如下：（1）利用斜拉桥中的斜拉索力无约束优化法中的弯曲能量最小法，确定平阳侧有、无辅助墩条件下两种结构体系的成桥索力，并将这两种成桥索力结果与实际成桥索力进行比较。（2）以工程实际的成桥索力为基础，对独塔斜拉桥在有、无辅助墩条件下进行静力分析，对比在有无辅助墩条件下两种不同结构体系在恒荷载、活荷载、移动荷载、温度荷载、荷载组合等工况下的内力以及变形的规律。（3）计算有、无辅助墩条件下两种不同结构体系的独塔斜拉桥的动力特性，包括自振周期、频率以及振型特点等。（4）对独塔斜拉桥进行反应谱分析，对比在有、无辅助墩条件下两种结构体系地震作用下的动力响应。
[Abstract]:The cable-stayed bridge is a kind of special structure bridge. The special part of the bridge is that the initial tension of a cable can be given, which can change the internal force and deformation of the whole cable-stayed bridge structure system and the force of each component. However, there are many factors that affect the internal force of cable-stayed bridge, such as adding auxiliary piers. For long-span statically indeterminate structures such as cable-stayed bridges, the structural system is subjected to very large forces under constant and live loads, and the dynamic response is more sensitive to earthquakes, typhoons and moving loads of vehicles. So it is necessary to study the static and dynamic responses of cable-stayed bridges with or without auxiliary piers. In this paper, the Feiyun River third Bridge is taken as the research background. By changing the two different structural systems of the single-tower cable-stayed bridge with or without auxiliary piers, the finite element software Midas/civil2010 is used to establish two kinds of system models. The influence of auxiliary piers on static, dynamic and seismic response of single tower cable-stayed bridge is systematically analyzed. The main work of this paper is as follows: (1) using the minimum bending energy method of the cable-stayed cable force optimization method in the cable-stayed bridge, the cable forces of the two structural systems are determined under the condition of the pingyang side and the non-auxiliary pier. The results are compared with the actual cable forces. (2) based on the actual bridge cable forces, the static analysis of single tower cable-stayed bridges with or without auxiliary piers is carried out. The internal forces and deformation of two different structural systems under constant load, live load, moving load, temperature load, load combination and so on are compared under the condition of auxiliary pier. (3) the law of internal force and deformation of two different structural systems under constant load, live load, moving load, temperature load, load combination, etc. The dynamic characteristics of two kinds of single tower cable-stayed bridges without auxiliary piers, including the natural vibration period, frequency and mode characteristics, etc. (4) the response spectrum analysis of single tower cable-stayed bridge is compared with that of single tower cable-stayed bridge. Dynamic response of two structural systems under seismic action without auxiliary piers.
【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】：U448.27

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