双河口大桥连续刚构桥梁设计复核

论文总字数：54769字

摘 要

毕业设计是将大学四年所学的课本上的理论知识综合运用于设计过程中，理解桥梁设计的过程和内容，能主动地查阅、运用相关规范文献，自我发现并解决问题，独立自主地完成设计各环节的一次自我检验过程。

本次毕业设计内容为对一座连续刚构桥梁进行复核，该桥位于双河口，全长520米，属于特大桥梁，主体结构是四跨预应力箱型梁构成，第一跨和第四跨都是90米，中间两跨为170米，这种大跨度连续刚构桥一般用于高速公路跨线、跨河，材料多采用混凝土，使用预应力进行设计，截面形式采用箱形截面，箱梁顶面设置单向2%横坡。

双河口特大桥建设项目地点位于湖北宜昌市长阳县，该地区规划为城市功能带，对提升经济与社会发展总体水平有重要意义。大桥的建设对于加速地区经济的发展将具有不可估量的推动作用,它不仅可以扩大城市发展的规模，还可以提供城市更加广阔的空间，协调城市的布局，对城市的经济发展有很好的推动作用，特别是对社会主义现代化建设的推动和和谐交通体系的构件具有很大的促进作用，改善城市的交通拥挤问题，提高人们的生活质量。

在此次设计中，着重验算了桥梁的上部结构，由于手算工作量大且难以保证准确率，所以利用Midas Civil对其进行了建模，并输入预应力钢束，进行预应力阶段和其他使用阶段主梁截面强度的计算，以及对构件变形和挠度进行计算分析，在计算过程中，由于考虑到结构的安全性，在施工阶段和运营阶段中出现的荷载组合，选择其中的最不利组合进行内力重分布，并且计入了二次弯矩，因为在施工过程中，由于温度的变化和构件本身受力引起的不均匀沉降，此次验算按照A类部分预应力混凝土结构进行设计，计算结果更贴近实际工程情况。

本次设计采用AutoCAD进行绘图，并通过word等办公软件进行汇总排版，整理出论文。本次设计中的桥梁施工方法采用常规的悬浇方式，最后完成整个工程的施工验收。

本人在毕业设计中得到了各位专业老师的悉心指导帮助，在此表示衷心的感谢。

由于本人的水平有限，实践经验不足，第一次对大跨度桥进行设计，设计过程中难免出现错误，还请老师批评指正。

关键词：预应力混凝土；变截面连续箱梁桥；挂篮悬浇；Midas；AutoCAD

The design and checking of continuous rigid frame bridge of Shuang He Kou Bridge

Abstract

The graduation design is to integrate the theoretical knowledge of the textbook of four years of university into the design process, to understand the process and content of the bridge design. It can actively consult and apply the relevant normative documents, find and solve the problems, and complete the self test process of the design of each link independently.

The content of this graduation project is the review of the continuous rigid-frame bridge design of Shuang He Kou Bridge. The total length of the Shuang He Kou Bridge is 520m. The upper structure of the main bridge is a 90 2x170 90m four-span prestressed concrete continuous rigid frame box beam. The large-span continuous rigid frame bridge is a very common type of highway crossing and crossing rivers. In the bridge type, materials are mostly made of concrete, and are designed using prestressing. The section form adopts a box-shaped section and a one-way 2% cross slope is set on the top surface of the box girder.

The location of the Shuanghekou Super Bridge Construction Project is located in Changyang County, Yichang City, Hubei Province. The area is planned to function as an urban functional belt and is of great significance for improving the overall level of economic and social development. The construction of the bridge will play an invaluable role in accelerating the development of the regional economy. It not only determines the nature, scale, and direction of development of the city, but also coordinates the overall deployment and specific arrangements of the urban spatial layout and various constructions. Therefore, the construction of this project is an integrated approach to achieve the goals of urban social and economic development. It plays an important role in advancing urban modernization, rapid economic development of industrial development zones, and building a harmonious transportation system in the region.

In this design, the upper structure of the bridge was emphatically examined. Due to the large amount of manual work and difficulty in ensuring the accuracy, MIDAS was used to model it, input the prestressed steel beam, and perform the prestressing phase and use. The strength and deformation of the section of the main girder are checked and the deflection is calculated. The most unfavorable combination of each construction phase and final operation phase was considered in the calculation. The prestressed secondary bending moments, system transformation, and internal force redistribution due to creep were taken into account. The overall temperature rise and fall, the gradient temperature of the box girder, and the branch were taken into account. The impact of uneven settlement, etc., according to class A part of the prestressed concrete structure design verification.

All design drawings of this design are drawn using computer-aided design, computerized documentation, typesetting, and printed drawings and papers.

In this design, the construction method is suspended.

I have received sincere and sincere gratitude from the professional teachers for their guidance and assistance in graduation design.

Due to my limited level and the first time that I was engaged in design, mistakes are inevitable. I hope teachers will criticize and correct me.

Key word: Prestressed concrete;Tapered continuous box girder bridge; Cantilever; Midas Civil; AutoCAD

目 录

摘 要 I

Abstract II

第一章 概述 1

1.1引言 1

1.2项目概况 1

1.2.1桥位平面图 1

1.2.2工程建设规模 1

1.3建设条件 2

1.3.1水文气象条件 2

1.3.2工程地质条件 2

1.4设计原则和技术标准 2

1.4.1设计原则 2

1.4.2采用的规范和标准 2

1.4.3技术标准 3

第二章 桥梁布置 4

2.1总体概况 4

第三章 结构建模与验算 6

3.1 Midas Civil 软件简介 6

3.2结构设计参数 6

3.2.1主桥 6

3.3桥梁建模 7

3.3.1主桥模型 7

3.3.2输入钢束信息 8

3.3.3输入施工信息 9

3.3.4边界条件 12

3.3.5输入使用信息 12

3.4截面特征及单元特征信息 13

3.5持久状况承载能力极限状态验算 14

3.5.1正截面抗弯验算 14

3.5.2斜截面抗剪承载力验算 15

3.6持久状况正常使用极限状态验算 16

3.6.1正截面抗裂验算——正截面混凝土拉应力验算 16

3.6.2斜截面抗裂验算——斜截面混凝土拉应力验算 21

3.6.3挠度验算 25

3.7持久状况和短暂状况构件应力计算 25

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