毕业设计原始资料 - 图文

内蒙古大学本科毕业设计

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目 录

1 ML河水文设计原始资料及计算 ........................................................................................... 5

1.1 设计原始资料 ................................................................................................................. 5 1.2 河段类型判断 ................................................................................................................. 5 1.3 设计流量和设计流速的复核 ......................................................................................... 5 1.4 拟定桥长 ......................................................................................................................... 6 1.6 冲刷计算 ......................................................................................................................... 9 1.7 方案比选 ....................................................................................................................... 10 2 设计资料及构造布置 ...............................................................................................................11

2.1 设计资料 ......................................................................................................................11 2.2 横截面布置 ................................................................................................................. 13 2.3 横截面沿跨长的变化 ................................................................................................. 16 2.4 横隔梁的位置 ............................................................................................................. 16 3 主梁作用效应计算 .............................................................................................................. 17

3.1 恒载内力计算 ............................................................................................................. 17

3.1.1. 恒载集度 ........................................................................................................... 17 3.1.2 恒载内力 .......................................................................................................... 18 3.2 可变作用效应计算（修正刚性横隔梁） ................................................................. 20

3.2.1 冲击系数和车道折减系数 .............................................................................. 20 3.2.2 计算主梁的荷载横向分布系数 ...................................................................... 20 3.2.3 车道荷载的取值 .............................................................................................. 25 3.2.4 计算可变作用效应 .......................................................................................... 25 3.3 主梁作用效应组合 ..................................................................................................... 30 4 预应力钢束的估算及其布置 .............................................................................................. 32

4.1 跨中截面钢束的估算和确定 ..................................................................................... 32 4.2 预应力纲筋的布置 ..................................................................................................... 33

4.2.1 跨中截面预应力钢筋的布置 .......................................................................... 33 4.2.2 锚固面钢束布置 .............................................................................................. 33 4.2.3 其他截面钢束位置及倾角计算 ...................................................................... 34 4.3 非预应力钢筋截面积估算及布置 ........................................................................... 37 5 计算主梁截面几何特性 ...................................................................................................... 39 6 钢束预应力损失估算 .......................................................................................................... 42

6.1 预应力钢筋张拉的控制应力ζcon ............................................................................. 42 6.2 钢束应力损失 ............................................................................................................. 42

6.2.1 预应力钢筋与管道摩擦引起的预应力损失ζL1 ........................................... 42 6.2.2 锚具变形，钢丝回缩引起的应力损失ζL2 ................................................... 42 6.2.3 预应力钢筋分批张拉时混凝土弹性压缩引起的应力损失。错误！未定义书签。

6.2.4 钢筋松弛引起的预应力损失ζL5 ................................... 错误！未定义书签。 6.2.5 混凝土收缩，徐变引起的损失ζL6 ............................................................... 46 6.2.6 预应力损失组合 .............................................................................................. 49

7 主梁截面承载力与应力验算 .............................................................................................. 51

7.1 持久状况截面承载能力极限状态计算 ..................................................................... 51

内蒙古大学本科毕业设计

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7.1.1 正截面承载力计算 .......................................................................................... 51 7.1.2 斜截面承载力计算 .......................................................................................... 51 7.2 持久状况正常使用极限状态抗裂验算 ..................................................................... 54

7.2.1 正截面抗裂验算 .............................................................................................. 54 7.2.2 斜截面的抗裂验算 .......................................................................................... 55 7.3 持久状况的构件应力验算 ......................................................................................... 59

7.3.1 正截面混凝土压应力验算 .............................................................................. 59 7.3.2 截面混凝土主压应力验算 .............................................................................. 60 7.4 短暂状况构件的应力验算 ......................................................................................... 60

7.4.1 预应力阶段的应力验算 .................................................................................. 60 7.4.2 吊装应力验算 .................................................................................................. 61

8 主梁端部的局部承压验算 ................................................................................................ 69

8.1 局部承压的截面尺寸验算 ......................................................................................... 69 8.2 局部抗压承载力验算 ................................................................................................. 70 9 主梁变形验算 .................................................................................................................... 72

9.1 荷载短期效应作用下主梁挠度验算 ......................................................................... 72 9.2 结构刚度验算 ............................................................................................................. 72 9.3 预加力引起的跨中反拱度 ......................................................................................... 72 9.4 预拱度的设置 ............................................................................................................. 73 10 横隔梁计算 .......................................................................................................................... 74 11 行车道板计算 ...................................................................................................................... 77

内蒙古大学本科毕业设计

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预应力混凝土T形梁桥

【摘要】 本文设计的是预应力混凝土T形梁桥，第一部分主要内容主要是通

过水文计算确定桥长，并通过方案的比选确定出本次设计的桥型，第二部分的内容比较多，主要包括结构尺寸的拟、恒载和活载内力计算、根据承载力配筋并进行截面的承载力和应力验算、张拉预应力钢筋和计算预应力钢筋的各种应力损失、验算局部承压和梁的挠度变形计算，同时还简单的计算复核了横隔梁和行车道板的承载力。

关键词：预应力 内力组合 承载力 应力损失

内蒙古大学本科毕业设计

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Prestressed Concrete T-beam Bridge

Author:Zhu Yafeng Tutor:Zhao Zhimeng

Abstract : This paper is the design of prestressed concrete T-beam bridge .The

first part is mainly determined by hydrology calculations long bridge, Adoption of the program and the selection of identifying this type design of the bridge, the second part of the contents of more, key structural dimensions, including the design, dead load and live Load, According capacity reinforcement and the capacity for cross sections and stress calculation, prestressed reinforced and prestressed reinforced the stress loss, partial pressure and checking the beam deflection, also simple calculation reviewed Cross beams and plates lane capacity.

Keywords : prestressed internal force portfolio Carrying Capacity

losses capacity stress