新疆某大桥35米后张法预应力混凝土简支T梁桥上部结构设计

本科生毕业设计(论文)题 目: 新疆某大桥 35 米后张法预应力 混凝土简支 T 梁桥上部结构设计 35 meters of a bridge in 英文题目: Xinjiang post-tensioned Concrete simply supported T beam bridge structure design 系 专 班 学 学 : 业: 级: 生: 号: 职称: 职称: 土木工程系 土木工程

指导教师: 指导教师:

摘 要

本次设计的是新疆某大桥35m后张法预应力混凝土简支T梁桥上部结构设计。根据相关技术规范要求，通过设计任务书、开题报告给出的基本数据，设计上部构造形式、横截面相应宽模度、预置高度、边梁悬臂长度、截面尺寸等

本设计采用的是后张法预应力混凝土的简支T型梁桥，35mT梁的计算跨径是34.0m，梁长34.96m，主梁为变截面T型梁。路基全宽26m，半幅桥梁宽12.75m，两侧采用刚性护栏宽度各0.5m，不设人行道；桥面铺装采用10cm沥青混凝土9cm水泥混凝土；车道数为双向4车道；汽车荷载是公路－Ⅰ级。上部构造形式采用5梁式；梁宽模数为B=2.4m，T梁预制高度为2.25m。

具体包括以下几个部分：桥型布置，结构各部分尺寸拟定；选取计算结构简图；恒载内力计算；活载内力计算；荷载组合；预应力钢束的估算及其布置；配筋计算；预应力损失计算；截面强度验算；截面应力及变形验算；行车道板的计算。

使用的工具有：”CAD”绘图软件、”MathType”数学公式编辑器、”桥梁博士”计算软件。

关 键 词：后张法，预应力混凝土，内力计算

35 meters of a bridge in Xinjiang post-tensioned Concrete simply

supported T beam bridge structure design

Abstract

The design of a bridge in XinJiang 35m post-tensioned prestressed concrete simply supported T beam bridge structure design. According to the relevant technical specifications, through the design plan, opening report gives the basic data, design the form of superstructure, the corresponding cross-section width of Modular, preset height, beam, cantilever length, section size, etc.

This design uses a post-tensioned priestess’s concrete simply supported T-beam bridge, 35mT calculations span beam is 34.0m, beam length 34.96m, the main beam for the variable cross-section T-beam. Sub grade full width 26m, half of the bridge width 12.75m, on both sides of the width of the rigid barrier 0.5m, with no sidewalks; asphalt concrete pavement 9cm by 10cm cement concrete; Drive number of two-way 4 Drive; car load highway - Ⅰ level. Superstructure forms a 5 beam; beam width modulus B = 2.4m, T precast beam height 2.25m.

Specifically include the following components: bridge layout, structural dimensions of various parts of the development; select the calculation structure diagram; dead load of the internal force calculation; Live Load calculation; load combination; prestressed steel beam and the layout of the estimation; reinforcement calculation; prestress loss calculation; strength calculation section; section stress and deformation of checking; lane board calculations.

Use the tools: "CAD" drawing software, "MathType" mathematical formula editor, "Bridge Doctor" calculation software.

Key Words：Post-tensioned, priestesses concrete, Internal force calculation

目 录

摘 要 ..................................................................................................................................... 1 Abstract ........................................................................................................................................ 2 引 言 ...................................................................................................................................... 1 1概况 ........................................................................................................................................... 2

1.1预应力混凝土 ............................................................................................................... 2 1.2预应力混凝土的目的 ................................................................................................... 2 1.3预应力混凝土的分类 ................................................................................................... 2 1.4预应力混凝土的优缺点 ............................................................................................... 2 1.5预应力混凝土桥 ........................................................................................................... 3 1.6预应力混凝土桥特点 ................................................................................................... 3 2设计基本资料及构造布置 ..................................................................................................... 5

2.1设计资料 ........................................................................................................................ 5 2.2主梁间距与主梁片数 ................................................................................................... 5 2.3主梁跨中截面主要尺寸拟订 ...................................................................................... 7 2.4截面几何特性计算 ....................................................................................................... 7 3主梁作用效应计算 ................................................................................................................ 12

3.1永久作用效应计算 ..................................................................................................... 12

3.1.1永久作用集度................................................................................................... 12 3.1.2永久作用效应................................................................................................... 13 3.2可变作用效应计算 ..................................................................................................... 14

3.2.1冲击系数和车道折减系数 .............................................................................. 14 3.2.2计算主梁的荷载横向分布系数 ..................................................................... 15 3.2.3车道荷载的取值 .............................................................................................. 19

3.2.4计算可变作用效应 …… 此处隐藏：12767字，全部文档内容请下载后查看。喜欢就下载吧 ……