预应力混凝土斜交箱梁桥设计

论文总字数：28631字

摘 要

我国的桥梁无论在建设还是在技术都已经取得了巨大的成就，在各类桥型上我国都已经建成具有代表性的桥梁，并且在某些领域已经取得世界领先的成就，我国的桥梁建设在某种程度上代表着世界桥梁技术发展方向。我国的桥梁建设奔着“高标准、高起点”的目标，相信这些会将我国桥梁建设推向更高水平。

本次毕业设计是自作25m预应力混凝土箱型梁桥设计，包括上部结构和下部结构设计两部分。

此次毕业设计的主要目的是为了让我们熟练运用CAD，并且能够有能力自行完成小型箱型梁桥的设计过程。

本设计的主要内容是：拟定上不箱梁的尺寸，进行内力计算及组合，配置预应力钢束及普通钢筋，构件变形及应力验算，绘制上部结构图纸。

关键词：尺寸拟定、内力组合、应力与配筋验算

Abstract

Our bridges in construction or in technology has made great achievements in all kinds of bridge in our country have built a bridge of representative, and has achieved the world"s leading achievements in some areas, the bridge construction of our country represents the world bridge technology development direction of bridge construction to a certain extent. China ran a high standard, high starting point ", believe that these will be the bridge construction in our country to a higher level.

The graduation design is made of 30m prestressed concrete box girder bridge design, including the upper and lower part of the structural design of two parts.

The graduation design of the main purpose is to let us skilled use of CAD, and can have the ability to complete the design process of small box girder bridge.

The design of the main content is: the development of the size of the box girder, the calculation and combination of internal forces, the configuration of prestressed steel beams and ordinary steel, structural deformation and stress checking, drawing the upper structure.

Key words: size formulation, internal force combination, stress and reinforcement checking

目录

1. 设计基本资料

1.1 跨度和桥面宽度..................................................1

1.2 技术标准..........................................................1

1.3 主要材料..........................................................1

1. 箱形梁构造形式及相关设计参数.......................................2
2. 主梁作用效应计算...................................................5

3.1 永久作用效应计算..................................................5

3.2 可变作用效应计算..................................................7

3.3 主梁作用效应组合.................................................15

1. 预应力钢束的估算及其布置..........................................16

4.1 预应力钢束数量的估算.............................................16

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

1. 计算主梁截面几何特性..............................................22

5.1 截面面积及惯性矩计算.............................................22

5.2 截面静矩计算.....................................................22

5.3 截面几何特性总表.................................................25

1. 钢束预应力损失估算................................................27

6.1 预应力钢筋张拉控制应力...........................................27

6.2 钢束应力损失.....................................................27

6.3 预应力钢筋分批张拉时混凝土弹性压缩引起的预应力损失...............28

6.4 钢筋松弛引起的预应力损失.........................................28

6.5 混凝土收缩和徐变引起的预应力损失.................................29

1. 承载能力极限状态计算..............................................31

7.1 正截面承载力计算.................................................31

7.2 斜截面抗剪承载力计算.............................................32

1. 持久状况正常使用极限状态抗裂性验算................................35

8.1 正截面抗裂性验算.................................................35

8.2 斜截面抗裂性验算.................................................36

1. 持久状况构件的应力计算............................................41

9.1 正截面混凝土法向压应力验算.......................................41

9.2 预应力筋拉应力验算................................................42

1. 短暂状况构件的应力验算.............................................44

10.1 预加应力阶段的应力验算............................................44

1. 主梁挠度计算.....................................................45

11.1 荷载短期效应作用下主梁挠度验算....................................45

11.2 预加力引起的上拱值计算............................................45

11.3 预拱度设置........................................................46

致谢 ..................................................................47

参考文献 ..................................................................48

第一章 设计基本资料

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