龙湾大桥施工监控及拉索横梁简化计算研究

发布时间：2018-06-20 14:48

本文选题：斜拉桥 + 拉索横梁　；参考：《华南理工大学》2014年硕士论文

【摘要】：随着全国城市建设和交通事业的发展，为了适应大流量交通的需求，近来桥梁的宽度越来越大，出现了不少桥宽达到30~40m的城市宽桥。本文以一座跨径组合为30+125+290+125+30m双塔双索面预应力混凝土斜拉桥为研究背景，主要的核心工作有以下几个方面：（1）通过建立有限元分析计算模型，模拟各个施工阶段的受力状态，确定各个施工阶段的初始张拉索力和立模标高，使整桥的监控效果达到了比较理想的状态。（2）建立主梁节段实体有限元模型，，通过数值分析获得预应力混凝土斜拉桥拉索横梁的受力特性和竖向荷载的分配规律，确立了龙湾大桥拉索横梁纵向受力基本符合两端交接的简支梁受力状态。（3）在箱梁桥横隔梁等效剪力法的基础上，充分考虑桥面结构纵向顶底板的作用，提出了一种拉索横梁简化计算的方法，并通过实例进行了验证。
[Abstract]:With the development of urban construction and transportation in China, in order to meet the demand of large traffic flow, the width of bridges has become wider and larger recently, and many urban wide bridges with a width of 30 ~ 40 meters have appeared. In this paper, a prestressed concrete cable-stayed bridge with a span combination of 30 125 290 125 125 30 m double tower and double cable plane is used as the research background. The main work of this paper is as follows: 1) the finite element analysis model is established. The stress state of each construction stage is simulated, and the initial tension force and the elevation of the vertical formwork are determined in each construction stage, so that the monitoring effect of the whole bridge reaches a more ideal state. (2) the solid finite element model of the main girder segment is established. Through numerical analysis, the stress characteristics and vertical load distribution of cable beam of prestressed concrete cable-stayed bridge are obtained. It is established that the longitudinal force of the cable beam of Longwan Bridge basically accords with the stress state of the simply supported beam at both ends of the bridge. On the basis of the equivalent shear method of the cross-beam of the box girder bridge, the function of the longitudinal roof and bottom slab of the bridge deck structure is fully considered. A simplified calculation method for cable beam is proposed and verified by an example.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27

【参考文献】