【土木】湘潭芙蓉大道海鸥(一)桥施工图设计

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土木 湘潭 芙蓉 大道 海鸥 施工图 设计
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湘潭芙蓉大道海鸥(一)桥施工图设计

目 录

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

1.1 技术标准................................................................................................1

1.2 采用规范................................................................................................1

2 方案拟定与比选..............................................................................................2

2.1 设计原则................................................................................................2

2.2 方案评选................................................................................................2

2.2.1 方案一:预应力混凝土等截面连续梁桥................................2

2.2.2 方案二:预应力混凝土单悬臂梁桥........................................4

2.2.3 方案三: 连续刚构桥................................................................5

2.3 方案比选表............................................................................................5

3 截面尺寸拟定..................................................................................................8

3.1 设计特点................................................................................................8

3.2 主跨径的尺寸拟定................................................................................8

3.3 主梁尺寸拟定........................................................................................8

3.4 主要材料................................................................................................9

3.5 施工方式................................................................................................9

4 内力计算........................................................................................................10

4.1 单元划分..............................................................................................10

4.2 毛截面几何特性计算..........................................................................10

4.3 一期恒载作用下主梁的内力..............................................................11

4.4 二期恒载作用下主梁的内力..............................................................12

4.5 支座沉降引起的内力..........................................................................14

4.6 活载内力计算......................................................................................15

4.6.1 车道横向分布调整系数..........................................................15

4.6.2 冲击系数..................................................................................15

湘潭芙蓉大道海鸥(一)桥施工图设计

4.6.3 汽车荷载..................................................................................16

4.7 温度内力..............................................................................................18

4.8 荷载组合..............................................................................................20

4.8.1 作用效应组合的原理...............................................................20

4.8.2 按承载能力极限状态设计......................................................21

4.8.3 按正常使用极限状态设计......................................................22

4.8.4 计算结果..................................................................................23

5 预应力钢束的估算和布置............................................................................27

5.1 计算原理..............................................................................................27

5.2 预应力钢筋的布置原则......................................................................30

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

5.4 预应力损失计算...................................................................................31

5.4.1 预应力筋与孔道壁之间摩擦引起的应力损失 l1

................ 32

5.4.2 锚具变形、钢筋回缩引起的应力损失 l 2

............................33

5.4.3 钢筋与台座间的温差引起的损失 l3

....................................33

5.4.4 混凝土弹性压缩引起的应力损失 l 4

.....................................33

5.4.5 预应力钢筋松弛引起的损失 l5

............................................34

5.4.6 混凝土收缩徐变引起的应力损失 l6

....................................34

6 承载能力验算................................................................................................36

7 应力验算........................................................................................................39

7.1 持久状况截面应力验算......................................................................39

7.2 短暂状况截面应力验算......................................................................40

7.3 正常使用阶段正截面开裂验算..........................................................41

7.4 正常使用阶段斜截面抗裂验算..........................................................42

7.5 正常使用阶段钢束的应力验算..........................................................42

8 挠度验算........................................................................................................44

8.1 挠度验算要求......................................................................................44

湘潭芙蓉大道海鸥(一)桥施工图设计

8.2 预拱度的设置......................................................................................45

9 施工图绘制....................................................................................................46

9.1 概述......................................................................................................46

9.2 总体布置图..........................................................................................46

9.3 主梁一般构造图..................................................................................46

9.4 主梁预应力钢束构造图......................................................................47

参考文献..............................................................................................................48

致谢......................................................................................................................49

附件 1:开题报告(文献综述)

附件 2:译文及原文影印件湘潭芙蓉大道海鸥(一)桥施工图设计

摘 要

本设计为湘潭芙蓉大道海鸥(一)桥施工图设计。首先根据设计任务书提供

的设计资料和要求,依据现行公路桥梁设计规范,综合考虑桥位的地址和地形条

件,经初选后提出了预应力混凝土等截面连续梁桥、预应力混凝土单悬臂梁桥和

连续刚构桥三种比选桥型。通过“技术先进、安全可靠、适用耐久、经济性、美

观性”的桥梁设计原则,比较三个方案的优缺点,最后选定方案为:预应力混凝

土等截面连续梁桥。

主梁采用单箱单室截面,梁高 2.8m。主梁施工采用满堂支架施工。

采用 Midas 软件计算桥梁结构的内力即内力组合,进行预应力钢筋的估算与

配置。根据《公预规》的规定,对该桥梁进行了截面强度验算、抗裂验算、持久

状况构件的应力验算和挠度验算。验算结果表明该设计是合理的,该桥梁的各项

性能在设计年限内均能满足要求。

关键词:连续梁桥;预应力混凝土;Midas 软件

THE XIANGTAN HIBISCUS AVENUE SEAGULL 1

BRIDGE CONSTRUCTION DESIGN

ABSTRACT

This design is about the construction design of Xiangtan Hibiscus Avenue

Seagull 1 Bridge.First, according to the design requirements of the design task book

information and offers, according to the current highway bridge design specifications,

considering the bridge site address and terrain conditions, after the primaries proposed

prestressed concrete girder bridge, prestressed concrete single-beam bridge and

continuous rigid frame bridge three kinds required bridge."Practical, safe, economic

and beautiful" principles of bridge design, compare the advantages and disadvantages

of the three schemes, finally selected solution as follows: Prestressed concrete

continuous beam bridge. Single box girder single-chamber cross section,high beam 2.8m.Full support by

the main beam construction.

Bridge structure using Midas software to calculate the internal forces that

internal forces combined to estimate the configuration of prestressing steel. According

to "public pre-compliance" requirement, the bridges were checking section strength,

crack resistance, stress and deflection checking checking enduring status member.

Checking results show that the design is reasonable, the performance of the bridge

within the design can meet the requirements of life.

Key words:continuous girder bridge;prestressed concrete; Midas software

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