摘要：由任务书提出的要求和原始的资料结合桥梁设计的规范，编制了预应力连续刚构桥、预应力连续梁桥、斜拉桥三个方案设计，并绘制方案总体布置图，综合比较经济技术指标最终确立了第一个方案为选取方案。本设计为60+110+60m的大跨度预应力混凝土刚构桥，桥墩是双薄壁墩，主梁截面为单箱单室，施工方法采用悬臂浇筑法。本次设计选择桥梁博士软件进行结构设计计算，首先在桥博里输入桥梁相关信息建好模型，计算恒载和活载内力，进行第一次的内力组合。之后由内力组合结果进行预应力筋的估算、预应力筋的布设，再计算预应力损失和次内力。由以上数据进行第二次内力组合，完成结构安全验算，并绘制桥梁主要部位施工图，最后编制设计书和整理图纸准备答辩。

关键词  预应力混凝土连续刚构桥  桥梁博士  内力组合 

毕业设计说明书外文摘要

Title   Design of 110 m Prestressed Concrete Continuous Rigid Frame Bridge with Main Span                                               

Abstract：The requirements of the task book and the original data combined with the design of the bridge design, the preparation of the prestressed continuous rigid frame bridge, prestressed continuous beam bridge, cable-stayed bridge three program design, and draw the overall layout of the program, comprehensive comparison of economic technology The index finally established the first option for the selection of the program. The design of 60 + 110 +60 m large span prestressed concrete rigid frame bridge, piers are double thin wall pier, the main section of the single section of a single box, the construction method using cantilever casting method. The design of the bridge design of the bridge for the design of the software, the first bridge in the input of bridge-related information built model, calculate the dead load and live load, the first combination of internal forces. After the result of the internal force combination of pre-stressed tendons to estimate the laying of prestressed tendons, and then calculate the prestress loss and sub-internal force. From the above data for the second internal force combination to complete the structural safety check, and draw the main parts of the bridge construction plans, the final preparation of the design book and finishing drawings ready to reply. 

Keywords  Prestressed concrete continuous rigid frame bridge  Bridge doctor Internal force combination

目  次

1 引言 . 5

1.1 预应力混凝土连续刚构桥的概述 .. 5

2 桥跨总体布置与结构主要尺寸  7

2.1 设计方案的比较与选择7

2.2 桥跨结构布置..8

2.3 截面构造与截面尺寸拟定.9

2.4 结构离散和施工阶段的划分 10

3 主梁建模 14

3.1 桥梁博士3.6的介绍.14

3.2 利用桥梁博士建模14

4 计算荷载内力.. 17

4.1 恒载内力..17

4.2 活载内力..18

4.3 作用效应组合（一）..18

5 设计预应力钢束 20

5.1 估算预应力钢束..20

5.2 布置预应力钢束..21

5.3 计算截面特性.22

5.4 计算预应力损失..22

6 计算次内力  24

6.1 混凝土收缩徐变次内力. 24

6.2 预应力次内力 25

6.3 支座不均匀沉降次内力. 25

6.4 温度次内力.. 25

7 作用效应组合（二）及截面安全验算.. 27

7.1 作用效应组合（二）..27

7.2 截面安全验算.34

结论 44

致谢 45

参考文献.. 46

附录A  毛截面几何特性 47