双线铁路60m+100+60m连续梁上部结构计算设计（很详细的毕业设计(2)

西南交通大学本科毕业设计 第V页

Abstract

The design entitled 60m +100 m +60 m prestressed concrete continuous girder bridge。The design process is as follows：

1.Make out the main structure and details of the size， taking into account the influence of bending rigidity and torsional rigidity，Box-beam is the best，the height of girder and slab thickness have a parabolic changes,( girder from 6.1m to 3.1m, perforation in orer thickness is 6.1 m, the cross is 3.1m. slab from 0.5m to 0.3m, perforation in orer thickness is 0.5 m, the cross is 0.35 m. ) and the top is always 0.3m；

2. The appropriate section length depends on the condition of equipment，stress and time factors。

3. CalculatingInternal structure with Midas(including dead load and lived load，train braking force,train lateral sway,the train derailment load and so on)；Try again according to the load combinations with prestressed concrete，then with the help of PSC design result，we can make sure the quantity of prestressed concrete。

4. Calculating every prestress loss and effective prestressed concrete, pay attention to the Secondary force caused by Steel beam and Creep and shrinkage of concrete, And then making the load combinations、checking the intensity of section；

5. Draw the engineering design and establish the design manuals.

The girder design by cantilever guyed travelers and full support，In the nearby across the bearings use semmetry cantilever construction, On the edge across near the fulcrum，use full support construction。In the design , the software using mainly include \Word, Excel, etc.

key words: The prestressed concrete，Continuous beam，Cantilever construction，\。

西南交通大学本科毕业设计 第VI页

目 录

第1章

绪论 ................................................................................................. 1

1.1概述 ............................................................................................................................. 1 1.1.1 预应力混凝土连续梁桥发展 .............................................................................. 1 1.1.2 设计特点 .............................................................................................................. 3 1.1.3 受力特点 .............................................................................................................. 3 1.1.4 构造特点 .............................................................................................................. 4 1.1.5 施工要点 .............................................................................................................. 4 1.2 设计基本资料 ............................................................................................................ 8 1.2.1 主要技术标准 ...................................................................................................... 8 1.2.2主要材料 ............................................................................................................... 8 1.2.3设计依据 ............................................................................................................... 9

第2章 主要尺寸拟定 ................................................................................ 10

2.1 桥梁结构总体规划布置 .......................................................................................... 10 2.1.1桥型方案比选 ..................................................................................................... 10

2.1.2梁部截面形式比选 ............................................................................................. 11 2.2 尺寸拟定 .................................................................................................................. 15 2.2.1 梁高拟定 ............................................................................................................ 16 2.2.2 顶板、底板厚度，顶板宽度 ............................................................................ 17 2.2.3 腹板 悬臂板长度 ............................................................................................. 17

第3章 内力计算 ........................................................................................ 19

3.1 MIDAS软件说明 ...................................................................................................... 19 3.1.1 MIDAS简介 ....................................................................................................... 19

3.1.2用MIDAS分析模型步骤 .................................................................................. 19 3.1.3 MIDAS计算模型 ............................................................................................... 20 3.2 静力荷载内力计算 .................................................................................................. 20 3.2.1 计算原理 ............................................................................................................ 20 3.2.2静力荷载计算 ..................................................................................................... 22 3.2.3荷载组合主要类型 ............................................................................................. 25 3.3 恒载内力计算 .......................................................................................................... 26

第4章 预应力筋设计 ................................................................................ 28

4.1 桥梁配筋 .................................................................................................................. 28

西南交通大学本科毕业设计 第VII页

4.1.1计算原理 ............................................................................................................. 28 4.1.2钢束布置原则 ..................................................................................................... 32 4.1.3结构配筋 ............................................................................................................. 33 4.2预应力损失计算 ....................................................................................................... 37 4.2.1钢筋与管道壁摩擦引起的应力损失 ................................................................. 37 4.2.2锚具变形引起的应力损失 ................................................................................. 38 4.2.3钢筋与台座间的温差引起的应力损失 ............................................................. 38 4.2.4混凝土弹性压缩引起的应力损失 ..................................................................... 38 4.2.5钢束松弛引起的应力损失 ................................................................................. 39 4.2.6混凝土收缩徐变引起的应力损失 ..................................................................... 39 4.2.7有效预应力的计算 ............................................................................................. 41 4.2.8有限元模型的预应力损失计算 ......................................................................... 41 4.3二次内力计算 ........................................................................................................... 46 4.3.1 预加力引起的二次内力 .................................................................................... 46 4.3.2 混凝土收缩徐变引起的二次内力 .................................................................... 47

第5章 截面验算及变形验算 .................................................................... 48

5.1截面内力、应力计算 ............................................................................................... 48 5.1.1施工阶段弯矩计算 ............................................................................................. 48

5.1.2施工阶段应力计算 ............................................................................................. 51 5.2刚度计算 ................................................................................................................... 58 5.3截面检算过程 ........................................................................................................... 59 5.3.1预应力钢筋混凝土梁的受力特点 ..................................................................... 60 5.3.2强度检算 ............................................................................................................. 61 5.4运营阶段的结构验算 ............................................................................................... 64 5.4.1运营阶段截面正应力验算 ................................................................................. 64 5.4.2运营阶段钢铰线应力验算 ................................................................................. 68 5.4.3斜截面主拉和主压应力验算 ............................................................................. 73 5.4.4截面抗裂验算 ..................................................................................................... 74 5.4.5混凝土剪应力验算 ............................................................................................. 77 5.5预加应力、运送及安装阶段的结构验算 ............................................................... 78 5.5.1预加应力阶段预应力筋验算 ............................................................................. 78 5.5.2传力锚固阶段预应力筋验算 ............................................................................. 78 5.5.3传力锚固阶段混凝土正应力验算 ..................................................................... 79

第6章 施工步骤及主要工程量................................................................ 81

6.1 施工步骤 .................................................................................................................. 81

西南交通大学本科毕业设计 第VIII页 6.2 混凝土总用量 .......................................................................................................... 82 6.3 钢绞线及锚具总用量 .............................................................................................. 82

结论 .................................................................................................................. 85 致谢 .................................................................................................................. 86 参考文献： ...................................................................................................... 87 附录 .................................................................................................................. 88

附录1：桥梁设计基本流程 .......................................................................................... 88 附录2：附图名称目录及其说明 .................................................................................. 89

西南交通大学本科毕业设计 第1页

第1章 绪论

1.1概述

1.1.1 预应力混凝土连续梁桥发展

自60年代中期在德国莱茵河上采用悬臂浇筑法建成Bendorf桥以来，悬臂浇筑施工法和悬臂拼装施工法得到不断改进、完善和推广应用，从而使得预应力混凝土连续梁桥成为许多国家广泛采用的桥型之一。

我国自50年代中期开始修建预应力混凝土梁桥，至今已有40多年的历史，比欧洲起步晚，但近年来发展迅速，在预应力混凝土桥梁的设计、结构分析、试验研究、预应力材料及工艺设备、施工工艺等方面日新月异，预应力混凝土梁桥的设计技术与施工技术都已达到相当高的水平。

预应力混凝土连续梁桥是预应力桥梁中的一种，它具有整体性能好、结构刚度大、变形小、抗震性能好，特别是主梁变形挠曲线平缓，桥面伸缩缝少，行车舒适等优点。加上这种桥型的设计施工均较成熟，施工质量和施工工期能得到控制，成桥后养护工作量小。预应力混凝土连续梁的适用范围一般在200m以内，上述种种因素使得这种桥型在公路、城市和铁路桥梁工程中得到广泛采用。目前我国已建成的有代表性的大跨径公路和城市预应力混凝土连续梁桥如表1所示。

表1 我国已建成大跨度预应力混凝土连续梁桥

1 2 3 4 5 6 7 8 9 10 南京长江二桥北汉桥 六库怒江大桥 黄浦江奉浦大桥 常德沅水大桥 东明黄河公路大桥 风陵渡黄河大桥 沙洋汉江大桥 珠江三桥 宜城汉江公路大桥 松花江大桥 90+165×3+90 85+154+85 85+125×3+85 84+120×3+84 75+120×7+75 87×5+87+114×7+87 63+111×6+63 80+110+80 55+100×4+55 59+90×7+59 江苏 云南 上海 湖南 山东 山西 湖北 广东 湖北 黑龙江

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