【土木】清江一桥施工图设计

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土木 清江 施工图 设计
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摘要

本桥的设计,遵照“安全、适用、经济、美观”的基本原则,同时充分考虑了建造技术的先进性以及环境保护和可持续发展的要求。本桥为 3×40m 等截面连续梁桥,桥面宽度为 15m。桥面纵坡为 2%,横坡为 1.5%。主梁采用 C50 混凝土。桥面铺装采用采用 4-12cm 厚的 C40 混凝土和 8cm 厚的沥青混凝土,容重分别为 25kN/m3 和 24kN/m 3 。该桥的设计分为四部分:1 . 桥型方案设计及比选;

2 . 上部结构内力计算;

3. 预应力钢束的估算与布置;

4. 强度、应力验算;

5. 施工图设计。

采用 midas 软件进行桥梁的内力计算及组合,估算和布置预应力筋,再进行强度和变形验算并绘制施工图。对软件计算结果进行分析比较及验算表明该设计计算方法正确,内力分布合理,符合设计任务要求。

关键字: 桥梁工程;等截面连续梁桥; 预应力;混凝土

目录

1 设计基本资料..................................................................................................................................1

1.1 主要技术指标..........................................................................................................................1

1.2 材料规格..................................................................................................................................2

1.3 施工方式..................................................................................................................................2

1.4 设计计算依据..........................................................................................................................2

2 设计要点及结构尺寸拟定..............................................................................................................4

2.1 设计要点..................................................................................................................................4

2.2 结构尺寸拟定..........................................................................................................................4

2.1.1 顺桥向尺寸的拟定....................................................................................................4

2.1.2 横桥向尺寸的拟定....................................................................................................4

3 上部结构内力计算..........................................................................................................................6

3.1 截面几何特性计算..................................................................................................................6

3.2 单元划分..................................................................................................................................8

3.3 恒载内力计算..........................................................................................................................9

3.4 活载内力计算.................................................................................................................. 12

3.5 温差内力计算........................................................................................................................16

3.6 墩台基础沉降内力计算........................................................................................................18

3.7 内力组合................................................................................................................................19

4 预应力钢束的估算与布置及预应力损失....................................................................................26

4.1 计算原理................................................................................................................................26

4.2 预应力筋估算结果................................................................................................................26

4.3 预应力筋布置原则................................................................................................................29

4.4 预应力钢束布置情况............................................................................................................31

4.5 主梁净、换算截面几何特性计算........................................................................................33

4.6 预应力损失计算....................................................................................................................34

4.6.1 预应力筋与孔道壁之间摩擦引起的应力损失

1 l

σ ...............................................35

清江一桥施工图设计

第 2页 共 3 页

4.6.2 锚具变形、钢筋回缩引起的应力损失

2 l

σ ..........................................................35

4.6.3 钢筋与台座间的温差引起的损失

3 l

σ ..................................................................36

4.6.4 混凝土弹性压缩引起的应力损失

4 l

σ ....................................................................36

4.6.5 预应力钢筋松弛引起的损失

5 l

σ ............................................................................37

4.6.6 混凝土收缩徐变引起的应力损失

6 l

σ ....................................................................37

5 普通钢筋的设计计算..................................................................................................................45

6 强度验算......................................................................................................................................47

6.1 基本理论..............................................................................................................................47

6.2 验算结果..............................................................................................................................48

7 抗裂验算......................................................................................................................................53

7.1 《公桥规》要求....................................................................................................................53

7.2 验算结果..............................................................................................................................53

8 短暂状况构件的应力验算..........................................................................................................58

8.1 《公桥规》要求....................................................................................................................58

8.2 验算结果..............................................................................................................................59

9 持久状况构件的应力验算..........................................................................................................62

9.1 《公桥规》要求..................................................................................................................62

9.2 验算结果............................................................................................................................62

10 挠度的计算与验算预拱度的设计..............................................................................................66

10.1 设计原理............................................................................................................................66

10.2 预加力引起的上拱度........................................................................................................66

10.3 使用荷载作用下的挠度....................................................................................................67

10.4 预应力砼受弯构件总挠度................................................................................................67

10.5 挠度验算及预拱度的设置................................................................................................67

11 设计图绘制..................................................................................................................................69

11.1 概述....................................................................................................................................69

11.2 总体布置图........................................................................................................................69

清江一桥施工图设计

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11.3 主梁一般构造图................................................................................................................69

11.4 主梁预应力钢束构造图....................................................................................................69

12 总结............................................................................................................................................71

参考文献............................................................................................................................................72

致谢....................................................................................................................................................73


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