【土木】K11+712 汪村三号大桥施工图设计

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土木 k11 三号 大桥 施工图 设计
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折叠 【土木】K11+712 汪村三号大桥施工图设计.rar【土木】K11+712 汪村三号大桥施工图设计.rar
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摘要

近年来,在中国的一些大城市中,高架铁路运输已经被发展起来。但是,在高架铁路运输系统中,专门针对于桥梁设计的编码还没有建立起来。基于广州地铁四号线上的预应力混凝土箱型梁桥,一些设计原则上的工艺特点以及技术申请,全部计划和城市轨道运输的桥梁设计荷载已经得到探索。同时,因为是第一次大规模使用在中国本土,短线匹配法的技术以及坐标变化原则已经得到简要介绍。还有几何线形控制的空间维度坐标变换的规则,用短线匹配法计算大量预制的转化也已经被推导出来。此外,用短线匹配法预制的几何线形控制的一些公式和悬臂拼装段都被简要介绍。

关键字:高架铁路运输,桥梁,设计原则,短线匹配法,几何线形控制

目 目  录

1.桥梁概况和桥型方案比选.....................................................................................................4

1.1 桥梁概况.....................................................................................................................4

1.2 施工方式.....................................................................................................................4

1.3 主要材料.....................................................................................................................5

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

1.5 桥型方案比选..............................................................................................................5

2.构尺寸的拟定及毛截面特性计算.......................................................................................13

2.1 主梁尺寸拟定...........................................................................................................13

2.1.1 主梁高度.......................................................................................................13

2.2.2 细部尺寸.......................................................................................................13

2.2 毛截面几何特性计算...............................................................................................13

3.结构内力计算.......................................................................................................................14

3.1 作用的类型划分.......................................................................................................14

3.2 一期自重作用效应计算...........................................................................................14

3.2.1 一期自重作用建模加载...............................................................................14

3.2.2 一期自重作用计算结果...............................................................................15

3.3 二期荷载作用效应计算............................................................................................16

3.3.1 二期自重作用集度的确定...........................................................................16

3.3.2 二期自重作用计算结果...............................................................................17

3.4 汽车荷载作用效应计算............................................................................................18

3.5 温差应力及基础沉降内力计算................................................................................20

3.5.1 温差应力........................................................................................................20

3.5.2 基础沉降计算...............................................................................................21

3.6 内力组合...................................................................................................................23

3.6.1 承载能力极限状态荷载效应组合................................................................23

3.6.2 正常使用极限状态荷载效应组合................................................................24

4.预应力钢束估算及布置.......................................................................................................31

4.1 钢束估算...................................................................................................................31

4.1.1 按正常使用状态的正截面抗裂验算要求估算...........................................31

4.1.2 只在截面下缘布置预应力筋.......................................................................32

4.1.3 只在截面上缘布置预应力筋.......................................................................33

4.2 钢束布置...................................................................................................................35

4.2.1 预应力筋弯起布置.......................................................................................35

4.2.2 预应力钢束布置间距...................................................................................36

4.2.3 顶板束下弯锚固位置...................................................................................36

5.配束后主梁的内力计算及内力组合...................................................................................37

5.1 引起的预应力损失值...............................................................................................37

K11+712 汪村三号大桥施工图设计

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5.1.1 后张法由预应力与管道之间摩擦引起的应力损失(

1 l

 )......................38

5.1.2 后张法由锚具变形、钢筋回缩和接缝压缩引起的应力损失(

2 l

 ).....38

5.1.3 后张法由混凝土弹性压缩引起的预应力损失(

4 l

 ).............................38

5.1.4 后张法由钢筋松弛引起的预应力损失终极值(

5 l

 ).............................39

5.1.5 后张法由混凝土收缩、徐变引起的预应力损失(

6 l

 ).........................39

5.1.6 截面预应力损失合计和有效预应力...........................................................40

6.截面强度验算.......................................................................................................................43

6.1 基本理论...................................................................................................................43

6.2 短暂状况截面应力验算...........................................................................................43

6.2.1 施工阶段法向压应力验算结果...................................................................43

6.3 抗裂验算....................................................................................................................45

6.3.1 正截面抗裂...................................................................................................45

6.3.1.1 正截面抗裂规范要求.....................................................................45

6.3.1.2 正截面抗裂验算...............................................................................45

6.3.2 斜截面抗裂验算............................................................................................48

6.4 按持久状况和短暂状况极限状态的要求进行验算................................................51

6.4.1 持久状况截面应力验算................................................................................51

6.4.2 正截面混凝土压应力验算结果...................................................................52

6.4.3 斜截面混凝土主压应力验算结果...............................................................53

6.5 正截面抗弯能力验算···············································54

6.5.1 基本理论···················································54

6.5.2 计算公式···················································55

6.5.3 验算结果···················································56

6.6 斜截面抗剪能力验算··············································

56

6.7 挠度验算....................................................................................................................57

6.7.1 挠度验算要求................................................................................................57

6.7.2 挠度验算结果...............................................................................................57

7.设计图绘制...........................................................................................................................58

7.1 概述...........................................................................................................................58

7.2 总体布置图...............................................................................................................58

7.3 主梁一般构造图.......................................................................................................58

7.4 主梁预应力钢束构造图...........................................................................................58

7.5 下部结构一般构造图及钢筋布置图.......................................................................58

8.总结.......................................................................................................................................59


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