论文总字数：44608字

摘 要

本设计是根据设计任务书的要求和相关规范的规定,对预应力混凝土简支T梁桥进行设计的。简支梁桥属于静定结构，且相邻桥孔各自单独受力，故最易设计成各种标准跨径的装配式构件。鉴于多孔简支梁桥各跨的构造和尺寸划一，从而就能简化施工管理工作，并降低施工费用。

在设计中，桥梁上部结构的计算着重分析了桥梁在使用中恒载以及活载的作用力，采用整体自重系数，荷载集度进行恒载内力的计算。运用杠杆原理法、刚性法求出活载横向分布系数，并运用最大荷载法进行活载的加载。进行了梁的配筋计算，估算了钢绞线的各种预应力损失，并进行预应力阶段和使用阶段主梁截面的强度和变形验算和挠度计算。

本设计全部设计图纸采用计算机辅助设计绘制，计算机编档、排版，打印出图及论文。

关键词：预应力混凝土；先简支后连续；T梁；MIDAS

Abstract

The design is concrete simply supported beam bridge design. Simply supported beam bridge is statically indeterminate structure and it is most easy to design into fabricated components of standard span. In view of the porous simply supported beam bridge span structure and size uniform, it will be able to simplify construction and reduce construction costs.
In the design, calculation of the bridge superstructure analyzes the dead load and live load , and it uses the overall weight factor and load set degree to calculate the dead load. The use of leverage, the rigid method to calculate the live load lateral distribution factor. For beam reinforcement calculation, it estimates the loss of the steel prestressing force. It also reckon the strength,deformation and deflection of the main beam cross-section during the prestress stage and use stage.

The design of all design drawings using computer aided design drawing, computer archiving, publishing, print out maps and papers.

Keywords: prestressed concrete;simple supported; T girder；MIDAS

目录

摘要...............................................................................................................................................................II

Abstract.........................................................................................................................................................III

第1章 设计资料及构造布置......................................................................................................................1

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

1.1.1桥梁跨径及桥宽...................................................................................................................1

1.1.2设计荷载...............................................................................................................................1

1.1.3材料及工艺...........................................................................................................................1

1.1.4设计依据...............................................................................................................................1

1.1.5基本计算数据.......................................................................................................................1

1.2 横截面布置...................................................................................................................................2

1.2.1主梁间距与主梁片数...........................................................................................................2

1.2.2主梁跨中截面尺寸拟定.......................................................................................................2

1.3 横截面沿跨长的变化....................................................................................................................3

1.4 横隔梁设置....................................................................................................................................3

第2章 主梁作用效应计算..........................................................................................................................4

2.1 结构自重作用效应........................................................................................................................4

2.1.1结构自重作用荷载集度.......................................................................................................4

2.1.2内力计算...............................................................................................................................5

2.2 汽车荷载作用效应........................................................................................................................7

2.2.1冲击系数和车道折减系数...................................................................................................7

2.2.2主梁荷载横向分布系数.......................................................................................................8

2.2.3车道荷载取值......................................................................................................................11

2.2.4可变作用效应......................................................................................................................11

2.2.5温差应力计算......................................................................................................................12

2.2.6基础沉降..............................................................................................................................13

2.3 主梁作用效应组合........................................................................................................................13

第3章 预应力钢束的估算及布置..............................................................................................................16

3.1 钢束估算........................................................................................................................................16

3.1.1按正常使用极限状态正截面抗裂要求估算钢束数...........................................................16

3.1.2按正常使用极限状态截面压应力要求估算钢束数...........................................................16

3.1.3按承载能力极限状态应力要求估算钢束数.......................................................................17

3.1.4估算结果...............................................................................................................................17

3.2 预应力钢束布置............................................................................................................................17

第4章 计算主梁截面几何特征..................................................................................................................19

第5章 钢束预应力损失计算......................................................................................................................20

5.1 预应力钢束与管道壁之间摩擦引起的预应力损失....................................................................20

5.2 由锚具变形，钢筋回缩引起的预应力损失................................................................................20

5.3 混凝土弹性压缩引起的预应力损失............................................................................................21

5.4 由钢束应力松弛引起的预应力损失............................................................................................22

5.5 混凝土收缩徐变引起的预应力损失............................................................................................22

5.6 预应力计算及钢束预应力损失汇总............................................................................................23

5.7 配束后主梁内力计算及组合........................................................................................................24

第6章 主梁截面承载力与应力验算..........................................................................................................26

6.1 截面强度验算................................................................................................................................26

6.2 抗裂验算........................................................................................................................................26

6.2.1正截面抗裂验算...................................................................................................................26

6.2.2斜截面抗裂验算...................................................................................................................27

6.3 持久状态构件的应力验算............................................................................................................30

6.3.1正截面混凝土压应力验算...................................................................................................30

6.3.2预应力筋拉应力验算...........................................................................................................31

6.3.3截面混凝土主压应力验算...................................................................................................32

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