【土木】沩水大桥左幅施工图设计

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土木 大桥 施工图 设计
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摘 要

 根据桥址处的具体情况,并结合设计要求,拟定出两个比选方案。分别是预应力

混凝土连续刚构桥、钢筋混凝土简支梁桥。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 270(70m+130m+70m)。主梁采用单箱单室

箱形截面。施工方法采用悬臂挂篮现浇施工法。使用 midas civil2012 程序进行结构计

算。计算结构的恒载内力,求得恒载内力下结构的弯矩图及剪力图;计算各控制截面内

力影响线,并按最不利情况进行加载,求得活载作用下内力包络图。定义基础沉降组,

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。并进行

荷载组合,根据各控制截面内力进行了估束和配筋计算,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。

关键词:预应力混凝土;连续梁桥;荷载组合

 沩水大桥左幅施工图设计

WEISHAN LEFT WATER BRIDGE CONSTRUCTION

DRAWING DESIGN

Abstract


According to the specific situation at the bridge site, combined with the design

requirements, to work out more than two alternatives. Are prestressed concrete continuous

rigid frame bridge, Reinforced concrete beam bridge. According to security, application,

economic, aesthetic principles of prestressed concrete continuous rigid frame bridge to

determine the recommended program Bridge length 270m (70m+130m+70m).Single box

girder single-cell box sections. Construction method is Cantilever cast-in-situ construction

hanging basket. Structure calculation using midas civil 2012 program. Calculate the structure

dead load internal forces, internal forces obtained under the structure dead load bending

moment diagram and shear diagram; calculate the internal force control section of line,

according to the most adverse conditions to load, internal forces obtained under live load

envelope. The definition of foundatio settlment group, obtained by the most unfavorable

combination of internal forces caused by foundation settlement. Applied thermal load, internal

forces obtained under temperature loading. And the load combination, according to Section

Analysis of the control beam and reinforcement estimates werecalculated, and a concrete

beam steel beam layout.Finally, the control section for the strength, crack resistance, stress

and deformation checking.

Key words: prestressed concrete; continuous beam bridge; load combination

 沩水大桥左幅施工图设计


目 录

一、设计基本资料及方案必选 ............................................... 1

1.1 概括 ................................................................ 1

1.2 方案比选............................................................ 1

1.2.1 方案描述 ........................................................ 1

1.2.2 方案比选........................................................ 3

1.3 主要材料............................................................ 4

1.4 设计计算依据........................................................ 5

二、上部结构尺寸拟定及内力计算 ........................................... 6

2.1 主梁尺寸拟定........................................................ 6

2.2 midas 建模 .......................................................... 6

2.3 主梁内力计算........................................................ 7

2.3.1 自重作用下主梁的内力计算........................................ 7

2.3.2 二期恒载作用下主梁的内力计算................................... 9

2.3.3 支座沉降引起的主梁内力计算..................................... 12

2.3.4 温度荷载引起的主梁内力......................................... 14

2.3.5 移动荷载作用下主梁内力计算..................................... 21

2.3.6 横隔板......................................................... 23

2.4 荷载组合........................................................... 25

三、施工方法及施工过程图示 .............................................. 35

3.1 施工方法........................................................... 35

3.2 施工过程图示....................................................... 36

四、预应力钢束的估算及布置 .............................................. 37

4.1 预应力钢筋的估算................................................... 37

4.2 预应力钢筋的布置原则............................................... 43

五、预应力损失及有效预应力计算 .......................................... 44

5.1 控制应力及有关参数的确定........................................... 44

5.2 预应力钢筋与管道壁间摩擦引起的应力损失计算......................... 44

5.3 锚具变形、钢筋回缩和接缝压缩引起的应力损失......................... 45

 沩水大桥左幅施工图设计

5.4 钢筋与台座间的温差引起的应力损失................................... 45

5.5 混凝土弹性压缩引起的应力损失....................................... 45

5.6 预应力钢束松弛引起的损失........................................... 46

5.7 混凝土收缩徐变引起的应力损失....................................... 46

5.8 预应力损失计算结果................................................. 47

六、截面强度验算 ........................................................ 49

6.1 基本理论........................................................... 49

6.2 计算公式及结果..................................................... 49

七、抗裂验算 ............................................................ 55

7.1 抗裂验算要求....................................................... 55

7.2 正截面抗裂验算结果................................................. 55

7.3 斜截面抗裂验算..................................................... 57

八、持久状况构件的应力验算 .............................................. 62

8.1 正截面混凝土压力验算............................................... 62

8.2 预应力筋拉应力验算................................................. 64

8.3 混凝土主压应力验算................................................. 69

九、短暂状况应力验算 .................................................... 71

十、变形验算 ............................................................ 75

10.1 挠度的计算与验算 .................................................. 75

十一、施工图绘制 ........................................................ 78

11.1 概述.............................................................. 78

11.2 总体布置图........................................................ 78

11.3 主梁一般构造图.................................................... 78

11.4 主梁预应力钢束构造图.............................................. 78

十二、参考文献 .......................................................... 79

总结 .................................................................... 80

致谢 .................................................................... 81

附件 1:开题报告

附件 2:译文及原文

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