【土木】磨子沟桥施工图设计

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土木 磨子 施工图 设计
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摘要

 我国改革开放以来,路、桥建设得到了飞速的发展,对改善人民的生活环境,改善

投资环境,促进经济的腾飞,起到了关键性的作用。桥梁工程在工程规模上约占道路总

造价的 10%—20%,它同时也是保证全线通车的咽喉,特别在战时,即便是高技术战争,

桥梁工程仍具有非常重要的地位,尤其是安全性至关重要,这就需要对桥梁进行计算。

本文就一座预应力混凝土连续梁桥为设计目的,从而探讨桥梁设计方面的一些知识。

根据对磨子沟桥址处的具体情况,并结合设计要求,拟定出三个比选方案,分别是

预应力混凝土变截面连续梁桥、预应力混凝土连续刚构桥及等截面连续梁桥。根据安全、

适用、经济、美观的原则确定预应力混凝土连续刚构桥为推荐方案,桥梁总长

75m(20m+35m+20m),主梁采用单箱双室箱形截面。使用 midas 程序进行结构计算。施

工方法主要为满堂支架施工法、悬臂浇筑法。

主要计算过程包括:计算恒载内力、活载内力,求得恒载内力、活载内力下结构的

弯矩图及剪力图,并按最不利情况进行加载,求得活载作用下内力包络图;按最不利组

合求得基础沉降引起的内力;施加温度荷载,求得温度荷载下内力;进行荷载组合,根

据各控制截面内力进行了估算和配筋计算,并对梁体进行具体的钢束布置。最后,对各

控制截面进行了强度、抗裂性、应力和变形验算。

计算表明,各项验算符合要求,设计方案合理

关键词:连续梁桥; 变截面; 预应力; 配筋;

 磨子沟桥施工图设计

Mozigou bridge construction project

Abstract

Since the reform and opening up of China,Road, bridge construction has been the rapid

development,To improve people's living environment, improve the investment environment

and promote economic take-off, played a key role. Bridge project on the scale of the project

about 10% -20% of the total cost of the road. It is also to ensure that the full opening of the

throat, especially in wartime, even the high-tech war, the bridge project still has a very

important position.Bridge is the throat of the traffic. Therefore, it is important to ensure the

practicability of bridge, especially the security of bridge, which requires precise calculation of

bridge. In order to explore some related knowledge of the bridge design, the thesis intends to

design a prestressed concrete continuous beam bridge.

According to the specific circumstances of Mishui River Bridge’s site, the thesis on the

basis of the design requirements, works out two alternatives, which are respectively a

prestressed concrete continuous girder bridge and a reinforced concrete continuous rigid

frame bridge. The principles of safe, applicable, economic and beautiful determine that the

prestressed concrete continuous girder bridge is the recommendation. With single cell and

single box sections, the length of the bridge is 75m (20m+35m+20m). And the design uses

midas program for structural calculation. The main construction method is the full framing

construction method and the cantilever method.

The calculation process mainly includes calculating the internal force of dead load,

calculating live load internal force, calculating internal force of dead load, and figuring out

live load internal force which is obtained under the structure of the bending moment diagram

and shear diagram. The author gains internal force envelope diagram which is under the

action of live load by loading on the basis of the most unfavorable situation. And on the basis 

 磨子沟桥施工图设计

of the most unfavorable combination, the author gains foundation settlement which is caused

by internal force. Internal force under the temperature load is gained by applying temperature

load. And Load combination works out according to each control cross section’s internal

force to do estimation and reinforcement calculation, and to allocate concrete steel for the

beam structure. Finally, the author carries out section strength, crack resistance, stress and

deformation calculations to each control cross.

In conclusion, calculation shows that the calculation accords with requirements and the

design scheme are reasonable.

Keywords: continuous Girder Bridge; variable cross-section; prestressing force;

reinforcement

 磨子沟桥施工图设计

目 录

1 桥梁方案设计-------------------------------------------------------------------------------------------1

1.1 工程概况及背景 -----------------------------------------------------------------------------------1

1.2 桥型方案比选 --------------------------------------------------------------------------------------1

方案一 三跨预应力混凝土变截面连续梁桥(20m+35m+20m) --------------------------------------------1

方案二 三跨预应力混凝土变截面连续刚构桥(20m+35m+20m) -----------------------------------------2

方案三 三跨预应力混凝土等截面连续梁桥(25m+25m+25m) --------------------------------------------2

1.3 横桥向设计 -----------------------------------------------------------------------------------------4

1.4 顺桥向设计 -----------------------------------------------------------------------------------------5

2 设计依据和主要参数----------------------------------------------------------------------------------6

3.1 材料各项基本数据与限值 -----------------------------------------------------------------------6

3.2 设计依据 --------------------------------------------------------------------------------------------7

3.3 计算参数及单位约定 -----------------------------------------------------------------------------7

3 桥梁有限元模型建立----------------------------------------------------------------------------------8

3.1 节段划分 --------------------------------------------------------------------------------------------8

3.2 截面单元几何特性 --------------------------------------------------------------------------------8

3.3 施工阶段划分 ------------------------------------------------------------------------------------ 10

4 主梁恒载内力计算----------------------------------------------------------------------------------- 14

4.1 荷载信息 ------------------------------------------------------------------------------------------ 14

4.2 恒载内力计算------------------------------------------------------------------------------------- 14

5 主梁活载内力计算----------------------------------------------------------------------------------- 18

5.1 荷载信息 ------------------------------------------------------------------------------------------ 18

5.2 主梁活载内力计算 ------------------------------------------------------------------------------ 19

6 温度及支座沉降次内力的计算-------------------------------------------------------------------- 26

6.1 温度次内力计算 --------------------------------------------------------------------------------- 26

6.2 支座沉降引起的内力计算 --------------------------------------------------------------------- 31

7 作用效应组合及内力包络图----------------------------------------------------------------------- 35

7.1 作用效应组合的原理 --------------------------------------------------------------------------- 35

 磨子沟桥施工图设计

7.2 承载能力极限状态内力组合------------------------------------------------------------------ 35

7.3 正常使用极限状态效应组合------------------------------------------------------------------ 39

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

8.1 计算原理 ------------------------------------------------------------------------------------------ 46

8.2 预应力筋估算结果 ------------------------------------------------------------------------------ 46

8.3 预应力筋的布置结果 --------------------------------------------------------------------------- 48

9 预应力损失及有效预应力计算-------------------------------------------------------------------- 50

9.1 控制应力及相关参数 --------------------------------------------------------------------------- 50

9.2 预应力损失及有效预应力计算结果 --------------------------------------------------------- 50

10 主梁次内力计算及内力组合 --------------------------------------------------------------------- 53

10.1 收缩徐变效应----------------------------------------------------------------------------------- 53

10.2 内力组合----------------------------------------------------------------------------------------- 53

11 持久状况承载能力极限状态验算 --------------------------------------------------------------- 60

11.1 正截面抗弯强度验算原理 -------------------------------------------------------------------- 60

11.2 验算结果 ----------------------------------------------------------------------------------------- 61

11.3 斜截面抗剪强度验算原理 -------------------------------------------------------------------- 63

11.4 验算结果 ----------------------------------------------------------------------------------------- 63

12 持久状况正常使用极限状态验算 --------------------------------------------------------------- 66

12.1 正截面抗裂验算 -------------------------------------------------------------------------------- 66

12.2 斜截面抗裂验算 -------------------------------------------------------------------------------- 67

12.3 正截面混凝土压应力验算-------------------------------------------------------------------- 70

12.4 斜截面混凝土压应力验算-------------------------------------------------------------------- 71

12.5 挠度验算----------------------------------------------------------------------------------------- 73

13 短暂状态应力验算 --------------------------------------------------------------------------------- 75

13.1 施工阶段法向压应力验算-------------------------------------------------------------------- 75

14 设计总结 --------------------------------------------------------------------------------------------- 78

参考文献-------------------------------------------------------------------------------------------------- 79

致谢-------------------------------------------------------------------------------------------------------- 80

附件 1 开题报告

附件 2 外文文献原文及译文

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