简支箱型桥梁设计

题目：五跨预应力连续箱梁设计（5*30m）

指导教师：**

职称：讲师

学生姓名：***

专业：土木工程

院（系）：建筑工程学院

完成时间：

年月日

目录

目录 (1)

摘要 (3)

绪论 (4)

1设计基本资料 (7)

1.1工程概况 (7)

1.2设计标准 (7)

1.3桥梁设计...........................................................................................................................

72设计要点及结构尺寸定 (9)

2.1设计要点 (9)

2.2结构尺寸的拟定 (10)

3主梁作用效应的计算 (13)

3.1自重作用效应的计算 (13)

3.2汽车荷载的效应和人群荷载效应 (19)

3.3温度应力及支座沉降内力计算 (28)

3.4内力组合 (30)

4预应力钢束的估算及布置 (39)

4.1采用部分预应力混凝土设计，以边梁计算为例 (39)

4.2钢束的布置 (40)

4.3主梁净、换算截面几何特性计算 (44)

5预应力损失及有效预应力计算 (46)

5.1基本理论 (46)

5.2预应力损失计算 (46)

6配束后主梁内力计算及内力组合 (58)

7截面强度验算 (66)

7.1基本理论 (66)

7.2计算公式 (66)

8抗裂验算 (70)

8.1《公预规》要求 (70)

8.2抗裂计算 (70)

9持久状况构件的应力验算 (81)

9.1正截面混凝土压应力验算 (81)

9.2预应力筋拉应力验算 (84)

9.3混凝土压应力验算 (85)

10短暂状况构件的应力验算 (93)

10.1预加应力阶段的应力验算 (93)

10.2吊装应力验算 (94)

致谢 (96)

参考文献 (97)

附录英语翻译 (98)

摘要

连续梁桥是工程上广泛使用的一种桥型，它不但具有可靠的强度、刚度及抗裂性，而且具有行车舒适平稳，养护工作量小，设计及施工经验成熟的特点。设计一座桥梁必须从桥跨布设，尺寸拟定，钢束布置以及施工方法等方面综合考虑，还要充分考虑设计参数和环境影响。本设计是五跨连续梁桥，截面形式为四片单箱单室预制箱型梁，纵向横截面；施工方式是先简支后连续施工的连续梁桥。该设计首先进行恒载、活载及次内力的计算，在此基础上进行荷载组合，绘制弯矩和剪力包络图；其次，根据短期效应组合配置预应力钢筋，并进行预应力损失的计算；最后，对连续梁桥进行验算，是否满足设计要求。

关键词：设计；连续梁桥；先简支后连续；预应力

Abstract

The continuous beam bridge is a kind of bridge type used widely on the project.It not only has a reliable strength,stiffness and cracking,but also has a smooth journey comfortable,conservation work on the design and construction experience of the characteristics of maturity.Design a bridge must be laid across from the bridge-laying,the size of the development,steel beam layout and construction methods,but also give full consideration to the design parameters and environmental impact.This is a design for a

five-span continuous bridge,whose cross-section is one-compartment and no changing on the road direction,constructed by after a first simply-supported.The first design includes constant load,the live load and the calculation of the internal forces.On the basis of a load combination,we can draw moment and shear envelope map.Next,according to the

short-term effect combination disposition prestressed reinforcement,and carries on the loss of prestress the computation.Finally,carries on the checking calculation to this continuous bridge,whether to satisfy the design requirements.

Key Words: design; continuous bridge; after a first simply-supported; prestress