高速公路(64+2×113+64)m连续梁桥设计毕业设计+任务书+实习报告

摘要

本设计为高速公路（64＋2×113+64）m连续梁桥设计。本设计的桥梁为单室，三车道，四跨公路连续梁桥，桥面宽度为12.75m,桥底宽7m。支座处梁高为7m，跨中处为3m，按1.6次抛物线变化；底板厚度支座处为0.8m,跨中为0.4m，线性变化；腹板厚度支座处0.7m，跨中处0.4m，线性变化。桥轴线为直线，采用2%的横坡设计，不设置纵坡。设计荷载为公路―Ⅰ级。

本设计主要采用桥梁博士3.0分析软件来进行结构内力分析计算，期间也用了Autocad和Excel进行辅助设计。全桥上部结构共分为112个梁单元，定义有51个施工阶段。

本设计的顺序是在CAD中画好各个截面，导入桥梁博士完成桥梁建模。并把每个毛截面的特性和内力以文本的形式输出。对荷载进行简单组合，把自重内力与移动活载内力进行组合用来初步估算纵向预应力钢筋束量。运行桥梁博士数据计算，根据估算的预应力钢筋束在桥梁博士中调束，最后以文本的形式输出桥梁的预应力损失和各个次内力的数据。接着进行各项验算，若验算通过则设计成功，否则返回进行调束，进行验算，直至验算通过。最后出图并编写计算书。

关键词：预应力混凝土；梁桥；悬臂浇筑施工；设计；Abstract

The design for the highway (64 +2×113 +64) m continuous girder bridge design. The design of the bridge is a single room, three-lane, four-span continuous girder road bridge deck width 12.75m, bridge bottom width 7m. Bearing beam at a height of 7m, at midspan is 3m, by 1.6 times parabola; backplane thickness at the support of 0.8m, cross for 0.4m, linear change; web thickness bearing at 0.7m, at midspan 0.4m, linear. Bridge axis is a straight line, using a 2% cross slope design, do not set the longitudinal slope. Design load for the highway -1.

This design uses Dr. Bridges 3.0 analysis software for structural analysis and calculation of internal forces, also used during the Autocad and Excel aided design. Ministry of full bridge girder structure is divided into 112 units, there are 51 definitions construction phase.

The design is in the order of the CAD drawing the various sections, the import is completed, Dr. bridge bridge modeling. And the characteristics and internal forces the output of each section of the hair in the form of text. For simple load combination, the weight of internal forces and moving live load force combined to preliminary estimates the amount of longitudinal prestressing tendons. Dr. Run bridge data calculation, based on estimates of prestressing tendons, Dr. bridge beam tuning in, the final form of text output bridge prestressing loss of secondary forces and various data. Followed by the checking, checking through the design if successful otherwise returns be adjusted beam, checking, checking up through. Finally, a map and written calculations.

Keywords: prestressed concrete; bridge; cantilever casting construction; design;

第1章绪论1

1.1预应力混凝土连续梁桥概述1

1.2毕业设计的目的和意义1

1.3施工工艺1

1.3.1施工特点1

1.3.2施工顺序2

1.3.3设计流程2

第2章整体设计说明3

2.1设计的基本资料3

2.1.1主要技术指标3

2.1.2所用材料规格3

2.2截面尺寸的拟定4

2.2.1梁高的拟定4

2.2.2腹板总厚度的拟定4

2.2.3底板厚度的拟定5

2.2.4截面尺寸的最后拟定5

2.2.5截面尺寸图5

2.3主梁的施工分段6

第3章桥梁建模9

3.1桥梁博士3.0的简介9

3.2利用桥梁博士建模9

3.2.1输入单元信息9

3.2.2输入施工阶段信息10

3.2.3输入使用阶段信息11

第4章主梁结构内力计算14

4.1主梁恒载内力计算14

4.1.1分段截面的几何特性14

4.1.2施工时的荷载14

4.1.3所用二期恒载15

4.1.4桥博计算模型15

4.1.5恒载计算结果15

4.2活载内力计算结果22

第5章预应力筋的估束和布置32

5.1预应力筋的估算原理32

5.2预应力筋的估算32

5.2.1组合最不利荷载32

5.2.2估算预应力钢筋36

5.3预应力筋的布置42

5.3.1 CAD模型中钢筋图的布置42

5.3.2桥梁博士模型中钢筋图的布置42

第6章预应力损失及有效预应力计算44

6.1预应力损失计算原理44

6.1.1管道摩阻损失计算44

6.1.2锚头变形损失计算44

6.1.3温差损失计算44

6.1.4弹性压缩损失计算45

6.1.5钢筋松弛损失计算45

6.1.6混凝土收缩徐变损失计算46

6.2有效预应力值计算46

第7章次内力的计算50

7.1收缩、徐变次内力50

7.2温度次内力55

7.3支座不均匀沉降引起的次内力61

第8章结构验算64

8.1内力组合与验算64

8.1.1承载能力极限状态基本组合64

8.1.2正常使用极限状态短期效应组合64

8.1.3正常使用极限状态长期效应组合65

8.2承载能力极限状态下的正截面验算65

8.3正常使用极限状态计算74

8.3.1正常使用极限状态计算理论74

8.3.2使用阶段正截面应力验算75

8.4挠度验算82

第9章主要工程量84

9.1混凝土用量84

9.2预应力钢绞线用量84

9.3锚具用量估算85

毕业设计总结86

致谢87

附录89

附录1毕业实习报告89