大跨度钢管混凝土拱桥制造线形的确定及对成桥状态受力性能影响研究

发布时间：2018-01-04 06:36

本文关键词：大跨度钢管混凝土拱桥制造线形的确定及对成桥状态受力性能影响研究　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着中国道路交通建设的发展,钢管混凝土拱桥的应用得到了极大的发展。随着钢管混凝土拱桥的跨径不断增大,节段增多,制造线形计算难度增大,而制造线形的计算结果对钢管拱肋在工厂预制加工和现场施工具有非常重要的指导作用。因此,对大跨度钢管混凝土拱桥制造线形的确定及对成桥状态受力性能影响研究就显得非常有意义。本文主要内容如下:(1)介绍了国内、外关于钢管混凝土拱桥制造线形、管内混凝土收缩徐变、几何非线性影响的研究现状。(2)介绍了钢管混凝土拱桥有限元计算方法的基本理论,论述了有限元分析方法的基本假定及用有限元方法计算混凝土收缩徐变和进行几何非线性分析的基本原理。(3)介绍了需要设置预拱度的原因、在设置预拱度时需要考虑的因素及预拱度设置的方法;分析了在计算预拱度时零初始位移法与切线初始位移法的基本原理及几何关系;以总溪河大桥为工程背景,运用Midas civil软件模拟施工全过程,计算了主拱在各个施工阶段所产生的位移;分析了拱结构自重、管内混凝土收缩徐变、几何非线性、及汽车荷载作用对主拱变形的影响,并在此基础上计算得到了总溪河大桥的制造线形。(4)分析了在不同制造线形下主拱的受力状态及应力分布;研究了制造线形偏差对成桥状态受力性能的影响,分析了几何非线性对主拱变形及应力的影响,分析了水平位移和线形偏差对主拱受力性能的影响。本文的研究成果对大跨度钢管混凝土拱桥的预拱度设置和制造线形的确定具有一定的工程实际意义和参考价值。
[Abstract]:With the development of road traffic construction in China, the application of concrete-filled steel tubular arch bridge has been greatly developed. The calculation results of manufacturing line are very important to guide the prefabrication and construction of steel pipe arch rib in the factory. It is of great significance to determine the manufacturing alignment of long-span concrete-filled steel tubular arch bridge and to study the influence on the behavior of the completed bridge. The main contents of this paper are as follows: 1) the domestic situation is introduced. The basic theory of finite element calculation method for CFST arch bridge is introduced in this paper. The basic assumptions of finite element analysis method and the basic principle of calculating shrinkage and creep of concrete by finite element method and geometric nonlinear analysis are discussed. The factors to be considered when setting pre-arch and the method of setting pre-arch; The basic principle and geometric relationship of the zero initial displacement method and the tangent initial displacement method in calculating the precamber are analyzed. Taking Tongxihe Bridge as the engineering background, using Midas civil software to simulate the whole construction process, the displacement of the main arch in each construction stage is calculated. The effects of dead weight of arch structure, shrinkage and creep of concrete in pipe, geometric nonlinearity and vehicle load on deformation of main arch are analyzed. On the basis of this, the manufacture line of Tongxihe Bridge is calculated. 4) the stress state and stress distribution of the main arch under different manufacturing lines are analyzed. The effect of manufacturing linear deviation on the mechanical behavior of the bridge is studied, and the effect of geometric nonlinearity on the deformation and stress of the main arch is analyzed. The influence of horizontal displacement and linear deviation on the mechanical performance of main arch is analyzed. The research results in this paper have a certain engineering practical significance and reference price for setting up the pre-arch degree of long-span concrete-filled steel tube arch bridge and determining the manufacture alignment. Value.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U441

【相似文献】