【土木】江安大桥施工图设计

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土木 江安 大桥 施工图 设计
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摘 要

此次毕业设计为预应力混凝土连续刚构桥,跨径组合为50m+80m+50m,桥宽12.6m,

双向两车道设计。主梁采用单箱单室截面形式,采用对称悬臂浇筑法施工。

最终得到的主要成果如下:

1、依据设计任务的要求,根据现行公路桥梁的设计规范,综合考虑桥梁的地质与地

形条件,按照“经济、美观、安全、适用”的桥梁设计原则,进行了方案之间的比选,

确定了结构的主要构造以及细部尺寸。

2、使用 MIDAS 软件建立桥梁上部结构的有限元计算模型,得到了各个控制截面的

内力结果,根据已得到的内力结果估算出桥梁纵向预应力钢筋的数量,并进行了预应力

钢筋钢束的布置。

3、对桥梁结构进行了截面的强度验算、截面抗裂性验算、相关应力验算和结构挠

度验算,验算结果表明此次设计满足规范要求。

关键词:预应力混凝土连续刚构桥;悬臂法施工;计算模型;内力结果;强度验算;

应力验算

江安大桥施工图设计

THE CONSTRUCYION DESIGN OF JIANGAN BRIDGE

ABSTRACT

This graduation design this time is primarily about the prestressed concrete continuous

rigid frame bridge design. The design of the bridge spans 50m + 80 m + 50m, cross section

for the single box room, bridge deck width 12.6m, according to the double-way double-lane

design. Using the symmetrical cantilever pouring construction girders.The main design

process steps are as follows:

Firstly, according to the requirement of the design task, and the basis of the existing

highway bridge design specifications, comprehensively considering the topographic and

geological conditions of the bridge site, according to the " applicable, economic, safe,

beautiful" principles of the bridge design, through the scheme comparison, determining the

main girder, the main structure and the detail size should meet the requirements of the section

size’s specifications , refer to the relevant existing similar bridge design drawings. girdering

with the single box single room variable cross-section box girder design.

Secondly, using the MIDAS software analysis the internal force of the dead load and live

load internal force.The load combination results are calculated by the MIDAS software, and

based the attempt calculating the number of the longitudinal prestressed reinforcement, and

comparing with the software estimation results. Then decorating the prestressed steel beams. Finally carry on the checking calculation, including the cross section strength calculation,

the anti-crack calculation, the deflection and the stress check calculation of the persistent state

components. Experience shows that the designed calculation method is correct, the internal

force distribution is reasonable, accord to the requirement of design task.

Key words: Prestressed concrete continuous rigid frame bridge; Cantilever

construction; calculation model; the internal force results; Strength

calculation; Stress check

江安大桥施工图设计

目 录

1 设计资料.................................................................................................................................................. 1

1.1 背景意义.......................................................................................................................1

1.2 主要技术指标...............................................................................................................1

1.3 设计规范.......................................................................................................................2

1.4 主要材料及计算参数...................................................................................................2

2 结构分析概述.........................................................................................................................................5

2.1 计算软件.......................................................................................................................5

2.2 结构整体模型概况.......................................................................................................5

2.3 上部结构整体计算.......................................................................................................6

2.4 下部结构整体计算.......................................................................................................6

3 结构尺寸的拟定及毛截面特性计算............................................................................................... 6

3.1 主梁截面尺寸的拟定...................................................................................................6

3.2 毛截面几何特性计算...................................................................................................7

4 主梁恒载内力计算及施工阶段内力分析...........................................................................8

4.1 主梁单元重量计算及桥面系重量计算.......................................................................8

4.2 施工过程及内力图.......................................................................................................9

4.3 悬臂施工完成后主梁内力.........................................................................................10

5 主梁作用效应计算............................................................................................................................. 12

5.1 汽车荷载作用效应计算.............................................................................................12

5.2 人群荷载作用效应计算.............................................................................................19

5.3 梁截面温度荷载作用效应计算.................................................................................22

5.4 支座沉降作用效应计算.............................................................................................26

5.5 主梁作用效应组合.....................................................................................................29

6 主梁预应力钢筋和普通钢筋的配置及有效预应力.........................................................40

6.1 按正常使用极限状态正截面抗裂验算要求估束.....................................................40

6.2 钢束布置.....................................................................................................................44

6.3 预应力损失及有效预应力计算.................................................................................49

7 配束后主梁内力计算及荷载组合.....................................................................................52

江安大桥施工图设计

7.1 配筋后结构重力效益.................................................................................................52

7.2 预应力效应.................................................................................................................54

7.3 收缩徐变效应.............................................................................................................56

7.4 内力组合.....................................................................................................................57

8 验算.....................................................................................................................................65

8.1 正截面强度验算.........................................................................................................65

8.1.1 使用阶段正截面抗弯验算......................................................................................65

8.1.2 使用阶段斜截面抗剪验算.....................................................................................69

8.2 截面抗裂验算.............................................................................................................72

8.2.1 使用阶段正截面抗裂验算...............................................................................72

8.2.2 使用阶段斜截面抗裂验算...............................................................................73

8.3 持久状况构件的应力验算.........................................................................................75

8.3.1 正截面混凝土压应力验算...............................................................................75

8.3.2 预应力筋拉应力验算.......................................................................................77

8.3.3 混凝土主压应力验算.......................................................................................80

8.4 短暂状态应力验算.....................................................................................................81

9 挠度验算及预拱度设置.....................................................................................................84

9.1 挠度验算.....................................................................................................................84

9.2 设置预拱度.................................................................................................................86

9.2.1 预应力引起的预拱度.............................................................................................86

9.2.1 预拱度设置..............................................................................................................86

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

致谢...........................................................................................................................................88

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