【土木】未央湖大桥施工图设计

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土木 未央 大桥 施工图 设计
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摘要

 本设计计算书是未央湖大桥的方案必选和施工图设计。

 该桥采用的是 3 跨变截面预应力混凝土连续梁桥,主桥分布为 80m+115m+80m。该

桥设计时速为 80km/h,设计荷载等级为公路Ⅱ级,桥面宽为 2.5m(人行道)+8m+2.5m

(人行道),无通航等级要求,桥面具有 2.0%的双向横坡,不考虑地震作用。

 本文阐述了未央湖大桥的设计及其验算过程,首先是桥型的方案必选,针对主桥进行

总体设计,然后对上部结构拟定细部尺寸并进行内力和配筋计算,再进行强度、应力及

变形等进行验算,最后进行施工图绘制。

关键词:变截面连续梁;预应力混凝土;悬臂浇筑;挂篮;验算

 未央湖大桥施工图设计

THE CONSTRUCTION DRAWING DESIGN WEIYANG

LAKE BRIDGE

ABSTRACT

The design calculation is Weiyang Lake Bridge plan selection and construction design.

The bridge is used by 3 cross-section of prestressed concrete continuous beam bridge, the

bridge is of 80m+115m+80m distribution. The bridge design speed of 80km/h, the design

load rating for highway grade II, bridge deck width of 2.5m (sidewalk) +8m+2.5m

(pavement), no navigable level requirement, two-way cross slope bridge deck with 2%, does

not consider the effect of earthquake.

This paper expounds the design and calculation process of Weiyang Lake Bridge is the

first bridge, plan selection, design for bridge, and then on the upper structure to the size of the

details and the internal force and reinforcement calculation, check the intensity, stress and

deformation checking, the construction drawing.

Key words: continuous beam of variable cross section; prestressed concrete; hanging

basket; cantilever; checking

 未央湖大桥施工图设计

目录

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

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

1.2 材料 ......................................................................................................................1

1.3 材料的基本计算用数据.....................................................................................1

1.4 设计参考规范......................................................................................................3

2 设计方案介绍及比选...................................................................................................4

2.1 总体设计原则......................................................................................................4

2.2 桥型方案介绍及比选.........................................................................................4

2.3 方案比较及推选方案确定.................................................................................9

3 受力和施工特点.......................................................................................................... 11

3.1 受力特点............................................................................................................11

3.2 重要构造介绍 .................................................................................................11

3.4 施工过程..........................................................................................................12

4 建立计算模型..............................................................................................................13

4.1 单元划分............................................................................................................13

4.2 截面特性............................................................................................................13

4.3 施工阶段............................................................................................................20

5 主梁恒载、活载作用效应计算.................................................................................23

5.1 荷载信息..........................................................................................................23

5.2 成桥状态下主梁的内力计算 ........................................................................24

5.3 主梁活载的内力计算.....................................................................................29

5.3.1 车道横向分布系数.................................................................................29

5.3.2 冲击系数 .................................................................................................29

5.3.3 主梁活载内力计算结果 ........................................................................30

 未央湖大桥施工图设计

5.4 部分支点及跨中截面的影响线 ....................................................................31

6 温度次内力的计算 .....................................................................................................34

6.1 温度次内力......................................................................................................34

6.2 温度次内力的计算 ...........................................................................................36

7 各种作用效应组合 .....................................................................................................39

7.1 各种作用效应组合的原理.............................................................................39

7.2 承载能力极限状态的内力组合 ....................................................................39

7.3 正常使用极限状态的效应组合 ......................................................................42

8 预应力钢束估算及布置.............................................................................................46

8.1 预应力钢筋截面面积的估算 ........................................................................46

8.2 预应力钢筋的估算结果.................................................................................47

8.3 预应力钢筋的布置.........................................................................................51

9 持久状况承载能力极限状态验算结果....................................................................52

9.1 截面受压区高度 ...............................................................................................52

9.2 正截面抗弯承载能力验算...............................................................................52

9.3 斜截面抗剪承载能力验算...............................................................................53

9.4 抗扭承载能力验算 ...........................................................................................54

9.5 支反力计算........................................................................................................54

10 持久状况正常使用极限状态验算结果..................................................................55

10.1 结构正截面抗裂验算.....................................................................................55

10.2 结构斜截面抗裂验算.....................................................................................55

11 持久状况构件应力验算结果...................................................................................57

11.1 正截面混凝土法向压应力验算 ....................................................................57

11.2 正截面受拉区钢筋拉应力验算 ....................................................................57

11.3 斜截面混凝土的主压应力验算 ....................................................................58

参考文献 ..........................................................................................................................59

致谢...................................................................................................................................61

附表...................................................................................................................................62

附表 1 正截面抗弯承载能力验算详细计算表格 ...............................................62

 未央湖大桥施工图设计

附表 2 斜截面抗剪承载能力验算详细计算表格 ...............................................77

附表 3 抗扭承载能力验算详细计算表格............................................................92

附表 4 结构正截面抗裂验算详细计算表格......................................................116

附表 5 结构斜截面抗裂验算详细计算表格......................................................124

附表 6 正截面混凝土法向压应力验算详细计算表格 .....................................132

附表 7 正截面受拉区钢筋拉应力验算详细计算表格 .....................................140

附表 8 斜截面混凝土的主压应力验算详细计算表格.....................................148

附件 1:开题报告………………………………………………………………….156

附件 2:外文翻译译文及原文影印件…………………………………………….166

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