摘 要

随着社会的进步、科技的发展，人们对生活水平的要求越来越高，为了适应这种越来越高的要求，社会各层都在共同努力进步。在这种快节奏的发展中，便捷的交通成为其中极为重要的一环。桥梁的建设使交通实现了多种可能：能迅速地跨越河流、穿越峡谷；在交通密集的地带能实现立体式交通，减少拥挤；跨海桥梁使海上运输更为便捷，便宜等等。而在众多类型的桥梁当中，不得不提的是集众多优点于一身的斜拉桥。斜拉桥构成的基本思路是由主梁承弯、主塔承压、斜拉索受拉，斜拉索可以看成是梁的支撑，通过多条斜拉索分散主梁的力。斜拉桥承载能力强，形式轻盈，在大跨径桥梁中，斜拉桥是最常见的形式之一。虽然起步较晚，这种桥型的发展并不比其他桥型差，现在我们身边随处可见斜拉桥。在特定的领域，斜拉桥俨然已成为桥梁发展的主流趋势。现阶段，斜拉桥正朝着高强轻质的方向发展，然而目前来说斜拉桥所承受的荷载主要还是自身的自重，为并非来自于车辆荷载。致力于这方面的研究，有望将斜拉桥向更大跨径发展。

斜拉桥属于高次超静定结构，为了对其进行有有效分析，需建立有限元模型。其结构分析计算十分复杂，施工方法的确定需要考虑到诸多因素，故而为了使桥梁结构合理，施工阶段顺利进行，要抱着严谨的态度，准确建立有限元模型，对各个阶段进行全面的计算分析。

本文以阳新莲花湖双塔斜拉桥为背景，基于有限元分析理论，应用迈达斯软件建立斜拉桥模型，并在此基础上展开各方面的分析计算。阳新莲花湖大桥位于阳新县中心城区，为城区客运交通主干道，也是阳新县重要的景观性市政桥梁。主跨采用双塔斜拉桥，桥跨组成为：60m 150m 60m，总长270m，主塔高41m，拉索为双索面，每根主塔两侧各22根，总共88根斜拉索。本文的主要工作包括以下几个方面。

1. 查阅文献资料，了解斜拉桥的结构形式和受力特点，扩大专业知识面；掌握桥梁工程、结构力学、结构设计原理中的相关结构与力学知识。
2. 研究了国内外常用的斜拉桥分析理论，包括斜拉索索力调整理论、斜拉桥非线性分析理论等。
3. 熟悉有限元模拟方法，熟悉迈达斯软件，试应用其原理解决分析过程中的问题；
4. 按照模型中建好的成桥模型，应用资料学习中掌握的方法，计算斜拉桥的合理成桥索力，并计算成桥模型的上部结构，包括塔梁内力、拉索强度、支座反力等。分析桥梁在各种荷载组合下的运行状。根据该桥的实际施工情况分为21个施工阶段，建立施工阶段模型，分析施工阶段，检验施工阶段安排是否合理。

关键词：双塔斜拉桥；预应力混凝土结构；力学性能分析；施工阶段

Abstract

With the progress of the society, the development of science and technology, people have more and more requirement of standard of living, in order to adapt to the increasingly high demand, every layer in the wold are working hard to keep up with the high development of society . In this fast pace of development, the convenient transportation become one of the extremely important link . The construction of the bridge make traffic implements a variety of possibility : quickly across the river and across the canyon;In traffic dense zone it can realize vertical transportation,and less cramped conditions; Sea-crossing bridge has made it much easier and cheap to maritime transport . And among many types of Bridges, we have to mention the cable-stayed bridge that have many advantages over others. What constitute the basic train of thought of cable-stayed bridge is main girder bending, main tower pressure and tension cable, cable can be regarded as a beam support, and through the multiple dispersed girder cable force.Cable-stayed bridge’s bearing capacity is strong, in the form of light. in the long-span bridge, cable-stayed bridge is one of the most common form. In specific areas, Cable-stayed bridge peremptory has become the mainstream trends of Bridges. Cable-stayed bridge at present, are moving in the direction of high strength and lightweight, for now, however, the weight of the cable-stayed bridge is mainly on the load itself, but not from the vehicle load. Committed to the research, we are expected to make a long-span to cable-stayed bridge.Cable-stayed bridge belongs to the high order statically indeterminate structure, in order to have effective analysis to it, we need to establish the finite element model. To analysis and calculation the structure is complex, To determine the construction method we need to consider many factors, so in order to make the bridge structure reasonable and the construction stage goes well, we should be with the rigorous attitude, accurate finite element model ,  and comprehensive calculation and analysis each stages.

This paper is based on the finite element analysis theory and the background of the Yangxin Lotus Lake Twin Towers cable-stayed bridge，Using Midas software to establish the model of cable stayed bridge, and on the basis of the analysis and calculation of the various aspects. Yangxin Lotus Lake Bridge is located in the central city of Yangxin County, the main road for urban passenger transport, but also an important landscape of Yangxin County Municipal bridge. Main bridge is a double pylon cable stayed bridge, the bridge across the groups become: 60m 150m 60m, length of 270m. Main tower 41, cable for double cable plane, every piece of both sides of the main tower of the 22, a total of 88 pieces of cable. The main work of this paper includes the following aspects.

1 refer to the literature, to understand the structure and mechanical characteristics of cable-stayed bridge and expand the professional knowledge and master the structure and mechanical knowledge of bridge engineering, structural mechanics and structural design principles；

2. Study the analysis theory of cable stayed bridge at home and abroad, including the cable tension adjustment theory, the nonlinear analysis theory of cable stayed bridge and so on；

3.Familiar with the finite element simulation method, familiar with Midas software, try to solve the problems in the process of analysis;

4.according to the bridge model, I use the method of data learning to calculate the reasonable cable force of cable stayed bridge, and calculate the upper structure of the bridge model, including the internal force of the tower, the strength of the cable, bearing reaction and so on. Analysis of the operation of the bridge under various load combinations. According to the actual construction of the bridge is divided into 21 construction stages, the establishment of the construction stage model, analysis of the construction stage, the construction stage of the test is reasonable.

Key Words: Twin Towers cable-stayed bridge； prestressed concrete structure ；mechanical property analysis ；construction stage

目 录

摘 要 I

Abstract II

目 录 IV

第1章 绪论 1

1.1研究目的及意义 1

1.2斜拉桥在国内外的发展 1

1.2.1 斜拉桥在国内的发展 1

1.2.2斜拉桥在国外的发展 4

1.2.3斜拉桥发展过程中存在的问题 6

1.2.4斜拉桥施工分析研究的意义 6