高速铁路(60+108+60)m预应力混凝土连续梁桥设计 - 图文(2)

西南交通大学本科毕业设计（论文） 第V页 (1) 根据任务书提出完成毕业设计工作计划并报指导教师认可。 (2) 掌握桥梁设计的基本原理和方法。

(3) 熟悉有关设计规范的应用和相关桥梁专业计算软件的使用。

(4) 设计计算无误，数据表格化；文整说明简明扼要，条理清晰；章节编号分明，图、表编号说明清楚；文句通顺，字迹工整，图纸美观；装订成册。 7、参考文献

[1] 强士中.桥梁工程（下册），北京：高等教育出版社，2000 [2] 范立础主编，桥梁工程（上册），北京：人民交通出版社，2001 [3] 范立础主编，预应力混凝土连续梁桥，北京：人民交通出版社，1988 [4] 邹毅松、王银辉, 连续梁桥，北京：人民交通出版社，2009 [5] 邬晓光、邵新鹏、万振江，刚架桥，北京：人民交通出版社，20017 [6] 郑健，中国高速铁路桥梁，北京：高等教育出版社，2001

[7] 黄棠、王效通，结构设计原理（上），北京：中国铁道出版社，1997 8、毕业设计各部分内容及时间分配：（共 15 周）

第一部分 熟悉毕业设计任务、文献阅读、资料收集；熟悉软件使用；桥跨总

体布置选定结构尺寸，确定施工方法； (2周)

第二部分 结构内力计算、自重产生的徐变次内力计算；恒、活载简单组合、

内力包络图； (3周)

第三部分 预应力筋估算和布置、预应力损失计算、预应力弹性次内力、徐变

次内力、温度次内力、支座沉降次内力计算； (3周)

第四部分 荷载组合、截面验算、变形检算、工程数量计算； (2周) 第五部分 编制设计说明书、编制设计图、外文资料翻译； (2周) 第六部分 毕业实习、编制实习报告、设计说明书和图纸的整理； (1周) 第七部分 毕业设计检查、完善、制作答辩PPT，毕业设计审查； (1周)

评阅及答辩 (1周)

备 注：期间有3天在实习 指导教师： 年 月 日 审 批 人： 年 月 日

西南交通大学本科毕业设计（论文） 第VI页 摘 要

本设计所设计的是高速铁路预应力混凝土连续梁桥，为双线铁路桥梁，主要设计桥梁的上部结构，设计荷载采用ZK活载。

本设计采用预应力混凝土连续梁桥，其孔径布置为60+108+60m，全长为228m。主梁采用变高度变截面的单箱单室箱型截面，主梁的高度变化曲线采用二次抛物线。桥面宽度为12m，中支座梁高9m，中跨跨中梁高5m。主梁采用对称悬臂施工法，边跨现浇段采用满堂支架施工。

本设计使用midas 软件分析，考虑施工过程体系转换和混凝土收缩徐变因素进行恒载内力计算。计算各控制截面内力影响线，并按最不利情况进行加载，求得活载内力包络图。定义基础沉降组，按最不利组合求得基础沉降引起的最不利内力。依据规范选取截面梯度温差模式，并计算温差引起的结构内力。分别按主力组合和主力附加力进行荷载组合，并得到结构组合内力包络图。根据各控制截面内力进行了估束和配筋计算，并绘制了梁体钢束布置图。最后，对各控制截面进行了强度、抗裂性、应力和变形验算，各项检算均满足规范对全预应力结构的要求。 关键词：连续梁；悬臂施工；内力计算；验算；midas

西南交通大学本科毕业设计（论文） 第VII页 Abstract

This design is a prestressed concrete continuous beam bridge . It is a double line railway . This design mainly designed the superstructure of the bridge. The load for design is the “ZK”live load.

It adopt a prestressed concrete continuous beam bridge with three spans of 60+108+60m ，Its total span is 228m . First , the size of girder is determined；highly variable for the variable beam cross-section single-Box Single girder . And the box girder’s shape likes a second-parabolic curve .The bridge deck is 12m in width , the depth of beam at middle bridge seat is 9m ,and the depth of beam at mid-span is 5m .Balanced cantilever construction method is used in constructing main girder, and the cast-in-situ segment is constructed by full scaffold construction method.

Then the Midas program is used to calculate the internal force caused by dead load of the first stage considering the construction stage ，after imposing the second stage dead load on the complete system . The internal force of the stage is calculated . The internal force influence lines of the control section is calculated ，then the live load is imposed according to the most adverse circumstances to get the Force Envelope .The program is used to determine the most adverse circumstances and calculate the internal force after defining the settlement groups of the basis.The temperature load is imposed consider the shrinkage and creep of the concrete . Then combination of load effects is made acoording to the Main force combination and the Main force plus additional force combination .According to the internal force of control sections the number of per-stressing steel stands is estimated and the per-stressing steel stands are arranged in the bridge . Finally a check is made of the bearing capacity the ability to resist crack and the sterss of the control section ，all the requirements can be met .

Keywords: Continuous beam; balanced cantilever construction; Internal force calculation; Checking computation; Midas

西南交通大学本科毕业设计（论文） 第VIII页 目 录

第1章 绪论 ................................................................................................................................................1 1.1 设计概述 ................................................................................................................................................. 1 1.1.1 预应力混凝土连续梁桥概述 ......................................................................................................... 1 1.1.2 平衡悬臂施工法特点 ..................................................................................................................... 1 1.1.3 预应力混凝土连续梁的特点 ......................................................................................................... 1 1.2 毕业设计的目的和意义 ......................................................................................................................... 2 1.2.1 毕业设计的目的............................................................................................................................ 2 1.2.2 毕业设计的意义............................................................................................................................ 2 1.3 毕业设计的主要内容 ............................................................................................................................ 2 第2章 桥跨总体布置和结构主要尺寸 ......................................................................................................4 2.1 设计概述 ................................................................................................................................................. 4 2.2 截面尺寸拟定 ......................................................................................................................................... 4 2.2.1主梁梁高 ......................................................................................................................................... 4 2.2.2顶板和底板厚度 ............................................................................................................................. 5 2.2.3腹板厚度 ......................................................................................................................................... 5 2.2.4横隔板 ............................................................................................................................................. 5 2.2.5承托 (梗腋) ..................................................................................................................................... 6 2.3 箱梁底缘曲线方程 ................................................................................................................................. 6 2.4 构造特点 ................................................................................................................................................. 6 2.4.1 零号块 ............................................................................................................................................. 6 2.4.2 挂篮 ................................................................................................................................................. 6 2.4.3 合拢段 ............................................................................................................................................. 7 2.5 主梁分段 ................................................................................................................................................. 7 2.5.1 节段划分 ....................................................................................................................................... 7 2.5.2 计算图示 ......................................................................................................................................... 8 2.6 施工阶段划分 ......................................................................................................................................... 9 2.7 施工注意事项 ....................................................................................................................................... 10 第3章 结构内力计算 ............................................................................................................................... 11 3.1 恒载内力计算 ....................................................................................................................................... 11

3.1.1 材料特性 ....................................................................................................................................... 11 3.1.2 单元特性 ....................................................................................................................................... 12 3.1.3 施工荷载 ....................................................................................................................................... 12 3.1.4 二期恒载 ....................................................................................................................................... 12 3.1.5 计算模型 ....................................................................................................................................... 12 3.1.6 恒载计算结果 ............................................................................................................................... 13 3.2 活载内力计算 ....................................................................................................................................... 16 3.2.1计算方法 ....................................................................................................................................... 16 3.2.2 活载动力系数的计算 ................................................................................................................... 16 第4章 预应力钢束设计 ........................................................................................................................... 19 4.1 预应力钢束估算 ................................................................................................................................... 19

4.1.1 计算原理 ....................................................................................................................................... 19 4.1.2 预应力钢束估算 ........................................................................................................................... 23 4.2 纵向向预应力钢束布置 ....................................................................................................................... 24 4.2.1 纵向预应力钢束的受力特点 ....................................................................................................... 24 4.2.2 纵向预应力钢束布置原则 ........................................................................................................... 25

西南交通大学本科毕业设计（论文） 第IX页 4.2.3 纵向预应力束的布置 ................................................................................................................... 25 4.3 竖向预应力钢束布置 ........................................................................................................................... 26 4.4 横向预应力钢束布置 ........................................................................................................................... 26 4.5 普通钢筋的布置 ................................................................................................................................... 27 第5章 截面特性计算 ............................................................................................................................... 28 5.1 计算原理 ............................................................................................................................................... 28

5.1.1 净截面几何特性 ........................................................................................................................... 28 5.1.2 换算截面几何特性 ....................................................................................................................... 29 5.2 截面几何特性计算 ............................................................................................................................... 30 第6 章 预应力损失及有效应力 ................................................................................................................ 32 6.1 管道摩阻损失 ....................................................................................................................................... 32 6.2 锚具变形损失 ....................................................................................................................................... 33 6.3 混凝土弹性压缩损失 ........................................................................................................................... 33 6.4 预应力钢筋应力松弛损失 ................................................................................................................... 33 6.5 混凝土的收缩徐变损失 ....................................................................................................................... 34 6.6 关键截面预应力损失计算 ................................................................................................................... 35 第7章 次内力计算 .................................................................................................................................. 38 7.1 预加力次内力计算 ............................................................................................................................... 38 7.3 混凝土徐变次内力计算 ....................................................................................................................... 42 7.4 温度次内力计算 ................................................................................................................................... 43 7.4.1 温度对结构的影响 ....................................................................................................................... 43 7.4.2 结构温度场的确定 ....................................................................................................................... 43 7.5 基础沉降次内力计算 ........................................................................................................................... 45 第8章 内力组合计算 ............................................................................................................................... 47 8.1 荷载的分类 ........................................................................................................................................... 47 8.2 荷载分项系数 ....................................................................................................................................... 47 8.3 主力组合 ............................................................................................................................................... 47 8.4 主力+附加力 ......................................................................................................................................... 50 第9章 主梁截面验算 ............................................................................................................................... 52 9.1 强度验算 ............................................................................................................................................... 52

9.1.1 正截面强度验算 ........................................................................................................................... 52 9.1.2 斜截面强度验算 ........................................................................................................................... 54 9.2 抗裂验算 ............................................................................................................................................... 56 9.2.1 正截面抗裂验算 ........................................................................................................................... 56 9.2.2 斜截面抗裂验算 ........................................................................................................................... 58 9.3 应力验算 ............................................................................................................................................... 59 9.3.1 施工阶段应力 ............................................................................................................................... 59 9.3.2 预应力钢筋应力验算 ................................................................................................................... 60 9.3.3 运营阶段应力验算 ....................................................................................................................... 60 9.4 刚度验算 ............................................................................................................................................... 63 9.4.1 竖向挠度验算 ............................................................................................................................... 63 9.4.2 横向挠度验算 ............................................................................................................................... 64 9.4.3 梁端转角验算 ............................................................................................................................... 64 9.4.4自振频率验算 ............................................................................................................................... 64 毕业设计总结 ........................................................................................................................................... 66 致谢 .......................................................................................................................................................... 68 参考文献 ................................................................................................................................................... 69

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