【土木】苏仙大桥(02 号桥)施工图设计(荷载:公路-I 级;桥宽:24m)

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土木 大桥 02 号桥 施工图 设计 荷载 公路 桥宽 24
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摘要

本设计为苏仙大桥(02 号桥)施工图设计。主要工作如下:

首先,根据设计任务要求,依据现行公路桥梁设计规范,综合考虑桥位的地质、地

形条件,经初选后提出了变截面预应力混凝土连续梁桥、预应力混凝土简支 T 梁桥两个

比选桥型。遵循“安全、适用、经济、美观”的桥梁设计原则,比较两个方案的优缺点,

把主桥为 45+60+45m 的变截面预应力混凝土连续梁桥作为主推荐方案。

其次,确定主梁主要构造及细部尺寸。设计采用单箱双室箱形截面,用悬臂浇筑法

施工。

然后,利用 midas 电算软件进行内力计算及组合,估算和布置预应力钢筋。

最后,进行强度应力及变形验算,并绘制施工图。经分析比较及验算表明该设计计

算方法正确,内力分布合理,符合设计任务的要求。

关键词:施工图设计;方案比选;变截面预应力混凝土连续梁桥;预应力钢筋;主梁

内力计算;验算

 苏仙大桥(02 号桥)施工图设计

THE CONSTRUCTION DESIGN OF SUXIAN’S NO.2 BRIDGE

ABSTRACT

The design is about the construction design of Suxian’s NO.2 bridge. And the process is

as follows.

First of all, according to the design requirements and the present standard specifications

for the design of highway bridge and culvert, considering the bridge’s geological and

topographical conditions comprehensively, it introduces two bridge type schemes which are

variable cross-section prestressed concrete continuous girder bridge and prestressed concrete

simple T girder bridge after primary selection. Complying with the principles of bridge

design—safety, practicality, economy and beauty, comparing the advantages and

disadvantages of the design schemes, a 45+60+45m vaiable cross-section prestressed concrete

continuous girder bridge is selected as the main recommend program.

Secondly, determine the main girder structure and details of the size. A single box with

double rooms is choosed as the cross-section shape. And the construction method of the

bridge is cantilever.

Thirdly, calculate and combine the internal force, estimate and arrange the prestressed

reinforcement by using midas software.

Finally, check strength and deformation, and draw construction drafts. The comparative

analysis and calculation shows that the calculation method is right and the distribution of the

internal force is reasonable, according with the requirements of the design.

Key words: construction design; scheme comparison; variable cross-section prestressed

concrete continuous beam bridge; Internal force calculation girder; Prestressed reinforced;

checking computation

 苏仙大桥(02 号桥)施工图设计

目录

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

1.1 预应力混凝土连续梁桥概述 ..........................................................................................1

1.2 毕业设计的目的与意义 ..................................................................................................3

2 设计说明................................................................................................................................5

2.1 概述 ..................................................................................................................................5

2.2 设计原始依据及基本设计要求 ......................................................................................5

2.3 地质情况 ..........................................................................................................................5

2.4 主要材料 .........................................................................................................................5

2.5 桥面铺装 ..........................................................................................................................6

2.6 施工方式 .........................................................................................................................6

2.7 设计规范 ..........................................................................................................................6

2.8 支座沉降 ..........................................................................................................................7

2.9 其他事项 ..........................................................................................................................7

3 方案比选................................................................................................................................8

3.1 本课题设计(研究)的目的 ..........................................................................................8

3.2 设计(研究)现状和发展趋势(文献综述) ..............................................................8

3.2.1 梁桥...........................................................................................................................8

3.2.2 连续梁桥....................................................................................................................9

3.3 研究方向及解决之道 ....................................................................................................10

3.4 方案比选 ........................................................................................................................13

3.5 推荐方案尚需解决的具体问题: ................................................................................14

4 桥跨总体布置及结构尺寸拟定...........................................................................................15

4.1 尺寸拟定...........................................................................................................................15

4.1.1 桥孔分跨........................................................................................................................15

4.1.2 截面设计........................................................................................................................15

4.1.3 梁高................................................................................................................................17

4.1.4 细部尺寸........................................................................................................................17

 苏仙大桥(02 号桥)施工图设计

5 主梁内力计算......................................................................................................................20

5.1 基本资料 .......................................................................................................................20

5.1.1 桥梁跨径及桥宽.....................................................................................................20

5.1.2 材料规格.................................................................................................................20

5.2 有限元建模 ...................................................................................................................20

5.2.1 单元的划分.............................................................................................................20

5.2.2 施工过程中各种荷载的计算.................................................................................22

5.2.3 施工过程的模拟.....................................................................................................26

5.3 恒载作用下的内力值 ....................................................................................................28

5.4 汽车荷载内力计算 ........................................................................................................30

5.4.1 冲击系数的计算......................................................................................................30

5.4.2 车道布置..................................................................................................................31

5.4.3 影响线.....................................................................................................................31

5.4.4 汽车荷载效应内力..................................................................................................33

5.5 温度内力计算 ...............................................................................................................35

5.5.1 均匀温度效应..........................................................................................................36

5.5.2 梯度温度效应..........................................................................................................38

5.6 基础沉降内力计算 .......................................................................................................40

5.7 作用效应组合 ...............................................................................................................41

5.7.1 承载能力极限状态计算时作用效应组合.............................................................42

5.7.2 正常使用极限状态计算时作用效应组合.............................................................44

6 预应力钢束的估算及布置...................................................................................................49

6.1 预应力钢筋数量估算 ....................................................................................................49

6.1.1 按正常使用极限状态的正截面抗裂要求估束......................................................49

6.1.2 按承载能力极限状态的应力要求估算.................................................................53

6.2 预应力钢束的布置 .......................................................................................................55

7 预应力损失计算...................................................................................................................58

8 配束后的内力组合...............................................................................................................65

8.1 承载内力极限状态组合 ................................................................................................65

8.2 短期作用组合 ................................................................................................................66

 苏仙大桥(02 号桥)施工图设计

8.3 长期作用组合 ................................................................................................................67

9 截面强度验算.......................................................................................................................69

9.1 主梁正截面强度验算 ....................................................................................................69

10 抗裂验算.............................................................................................................................73

10.1 正截面抗裂验算 ..........................................................................................................73

10.2 斜截面抗裂验算 ..........................................................................................................74

11 持久状况构件的应力验算.................................................................................................77

11.1 正截面混凝土压应力验算 ..........................................................................................77

11.2 预应力钢筋拉应力验算 ..............................................................................................78

11.3 混凝土主压应力验算 ..................................................................................................81

12 挠度验算和预拱度计算.....................................................................................................83

12.1 挠度验算 ......................................................................................................................83

12.2 预拱度计算 ..................................................................................................................84

13 设计总结与致谢.................................................................................................................86

14 参考文献.............................................................................................................................87

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