本科毕业设计
题目 50m+70m+50m预应力混凝土连
续箱型梁桥设计
学生姓名 教学院系 专业年级 指导教师 单 位 辅导教师 单 位
学 号
土木工程与建筑学院 土木工程09级
职 称 西南石油大学
讲师
职 称
完成日期
1
2013 年 6 月
5
日
Southwest Petroleum University
Graduation Thesis
Design Of Prestressed Concrete Continuous box
Beam Bridge
Grade: Class 3, Grade 2009 Name: Liu Lian Fu
Speciality: Civil Engineering Instructor: Liao Yu Feng
School of Civil Engineering and archetecture
2012-6-5
摘要
本论文主要是进行预应力混凝土连续箱型梁桥上部结构设计。预应力混凝土连续梁桥具有变形小、行车稳定舒适、结构受力性能好、后期维护量小、抗震能力强等优点成为现代桥梁的主要组成之一。
本论文设计分为主桥和引桥的设计，在方案比选阶段，主桥只涉及到了主要的尺寸拟定及平、纵、横断面图的绘制，不做计算。引桥为本论文的核心。
引桥为50+70+50m的预应力混凝土连续箱型梁桥，分为单幅设计，单箱双室，桥面宽13m，为3车道，设计荷载标准为公路一级。
设计过程如下：
尺寸拟定、利用桥博建模、恒载计算、次内力计算、预应力钢筋的估算、内力组合、、预应力损失计算、主梁验算、挠度与预拱度的设置、主要工程数量的汇总。 关键词：预应力混凝土连续梁桥 恒载 次内力 内力组合 桥梁博士 主梁验算 地震
Abstract
This dissertation is mainly on superstructure design of prestressed concrete
continuous box girder bridge . The prestressed concrete continuous beam bridge has the advantages of small deformation、 stable driving comfort、 good mechanical properties of the structure、 small amount of maintenance、 strong seismic ability and so on, which become one of the main components of modern bridge.
This dissertation is divided into the design of the main bridge and the bridge approach. During comparison and selection phase of the program, the main bridge involves only the main dimensions formulate and flat、vertical、cross-sectional drawing, without being calculated. The approach bridge is the core of this dissertation.
The approach bridge is a prestressed concrete continuous box girder bridge(structure size:50+70+50m ),which is divided into a single design, single box and double room.Other indicators:bridge deck width of 13m、3 lanes, design load standard for highway 1.
The design process is as follows:
Size formulation、modeling by using Dr. bridge software、the calculation of dead load、the
calculation of secondary internal force、estimation of prestressed reinforcement、the combination of internal forces、the calculation of the prestressed loss、girder checking、deflection and camber setting、the summary of major engineering quantity.
Keywords: prestressed concrete continuous beam bridge; dead load、secondary internal force；the combination of internal forces；Dr. Bridges Software; beam calculation；earthquake
50m+70m+50m预应力混凝土连续箱型梁桥设计
目录
1绪论 ................................................................. 1
1.1预应力混凝土连续箱型梁桥的概述 .................................. 1 1.2选题的意义 ...................................................... 2 2设计资料 ............................................................. 3
2.1工程概况 ........................................................ 3 2.2主要材料及要求 .................................................. 4 3桥跨总体布置及结构尺寸拟定 ........................................... 6
3.1尺寸拟定 ........................................................ 6
3.1.1桥孔分跨 .................................................. 6 3.1.2截面形式 .................................................. 6 3.1.3梁高 ...................................................... 7 3.1.4细部尺寸 .................................................. 7
4主梁建模 ............................................................ 10
4.1主梁分段与施工阶段划分 ......................................... 10
4.1.1分段原则 ................................................. 10 4.1.2具体分段 ................................................. 10 4.1.3主梁施工方法及注意事项 ................................... 11
5恒载计算 ............................................................ 14
5.1主梁内力计算 ................................................... 14
5.1.2恒载计算 ................................................. 16 5.2.活载因子的计算 ................................................ 17 5.3活载内力计算 ................................................... 18 5.4单元影响线计算 ................................................. 19 6 次内力计算 .......................................................... 23
6.1预加力引起的次内力 ............................................. 23 6.2收缩徐变引起的次内力 ........................................... 24 6.3 温度次内力的计算 .............................................. 25 6.4支座沉降次内力的计算 ........................................... 27 7预应力钢束的估算与布置 .............................................. 32
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