汴河大桥上部结构设计与计算分析毕业论文

2020-04-08 12:35:13

摘要

近年来，我国在桥梁工程领域取得了巨大成就，桥梁的设计和施工技术的水平都得到了极大的提高。其中，预应力混凝土连续梁桥的发展尤为突出。预应力混凝土连续梁桥跨越能力大，施工方法灵活，适应性强，结构刚度大变形小，动力性能好，而且有利于高速行车，与其他桥梁相比具有较大的优越性，因此，预应力混凝土连续梁桥在国内被广泛应用。本次毕业设计的题目是汴河大桥，本桥跨越汴河，是主跨为，施工采用施工，，边跨直线梁段采用。

设计过程如下：

1.查阅相关资料，了解、以及施工工艺方法，通过的方法确定了最佳方案为；

2.进行，主要确定，梁高、底板厚度按，；

3.利用Midas Civil 2015软件建立桥梁模型，分析结构内力，进行预应力钢束的估算，然后再布置预应力钢束，进行预应力损失的计算以及次内力的计算；

4.进行截面强度验算。

关键词：连续梁；悬臂挂篮施工；预应力钢筋；Midas Civil 2015

导师签名：年月日

Abstract

In recent years, China has made great achievements in the field of bridge engineering, and the level of bridge design and construction technology has been greatly improved. Among them, the development of prestressed concrete continuous beam bridges is particularly prominent. The prestressed concrete continuous beam bridge has large span capability, flexible construction method, strong adaptability, large structural rigidity and small deformation, good dynamic performance, and is conducive to high-speed driving. Compared with other bridges, it has greater advantages. Therefore, the prestressed Concrete continuous beam bridges are widely used in China.The subject of this graduation project is the design and calculation analysis of the superstructure of Bian River Bridge. The bridge spans Bian River and is a 48 78 48m prestressed concrete variable-section continuous box girder bridge with main beam. Cantilever casting method, the use of basket symmetrical balanced cast concrete, the use of full-span bracket construction method.

The procedure of the design is listed below:

First, check the relevant data to understand the structural characteristics, stress characteristics and construction process methods of prestressed concrete continuous girder bridges. Through the comparison of the bridge type scheme, it is determined that the best plan is the design of prestressed concrete continuous girder bridges;

Second, Formulating the size of the superstructure, mainly determining the dimensions of the detail structure of the box girder, the height of the beam, the thickness of the bottom plate changes according to the second parabola, and the thickness of the web adopts a linear change;

Third, Using Midas Civil 2015 software to establish a bridge model, analyze the internal forces of the structure, estimate the prestressed steel bundles, and then arrange the prestressed steel bundles to calculate the prestress loss and calculate the secondary internal forces;

Forth, Check the strength of section .

Key words ： Pre-stressed concrete continuous girder bridge; Cantilever constructed ; prestressed steel；Midas Civil 2015

第1章绪论 1

1.1预应力混凝土连续梁桥的概况 1

1.2施工工艺方法 1

1.3毕业设计主要内容 2

1.4 毕业设计的目的和意义 2

第2章桥型方案比选 3

2.1桥梁设计原则 3

2.2方案比选 5

2.3主梁截面形式探讨选定 6

2.4桥墩桥台方案确定 7