某跨河大桥毕业设计 - 图文

本科毕业设计说明书

题 目：某跨河大桥设计（方案一） 院 （部）： 土木工程学院 专 业： 土木工程 班 级： 姓 名： 学 号： 指导教师： 完成日期：

毕业设计说明书

目 录

摘 要 ·············································································································· VI

ABSTRACT ···································································· 错误！未定义书签。

1 前言 ················································································································ 1

1.1基本设计资料 ····················································································································· 1 1.2设计规范 ····························································································································· 1 1.3主要材料 ····························································································································· 1

2 方案比选 ········································································································ 3

2.1 T构带挂梁 ··························································································································· 3 2.2连续梁桥 ········································································································ 3 2.3连续刚构桥 ························································································································· 4 2.4拱桥 ····································································································································· 4 2.5 方案比选 ···························································································································· 4 2.5.1连续梁桥 ························································································································ 4 2.5.2连续刚构桥 ···················································································································· 6

3 施工阶段的划分 ···························································································· 9

3.1全桥结构计算图式的确定 ································································································· 9 3.2全桥施工阶段的划分 ········································································································· 9 3.3桥梁博士截面几何特征计算原理 ··················································································· 12

4 内力计算与荷载组合(一) ·············································································13

4.1内力计算 ··························································································································· 13 4.2 钢束布置 ·························································································································· 20 4.2.1 各截面的最小配筋面积的计算 ················································································· 20

5 预应力损失及有效预应力计算 ····································································27

5.1预应力损失计算原理 ······································································································· 27 5.1.1摩阻损失 ······················································································································ 27 5.1.2锚具变形损失 ·············································································································· 27 5.1.3 温差损失 ····················································································································· 27

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毕业设计说明书

5.1.4 混凝土弹性压缩损失 ································································································· 27 5.1.5钢筋应力松弛损失 ······································································································ 27 5.1.6混凝土收缩、徐变损失 ······························································································ 28

6 预加力、徐变次内力及内力组合（二） ····················································32

6.1 次内力及其产生原因 ······································································································ 32 6.2 收缩、徐变次内力 ·········································································································· 32 6.3 温度次内力 ······················································································································ 33 6.4荷载组合(二) ···················································································································· 36

7 强度验算 ·······································································································49

7.1 持久状况承载能力极限状态计算 ·················································································· 49 7.2抗裂性验算 ······················································································································· 50 7.3 持久状况应力验算 ·········································································································· 50 7.4变形计算 ··························································································································· 51

8 应力、变形及其他验算 ···············································································53

8.1 钢束验算 ·························································································································· 53 8.2 混凝土应力验算 ·············································································································· 54 8.3施工阶段应力验算 ··········································································································· 55

9 下部结构计算 ·······························································································60

9.1墩柱设计与计算 ··············································································································· 60 9.1.1基本资料 ······················································································································ 60 9.1.2 墩柱计算 ····················································································································· 61 9.2桩基础设计计算 ··············································································································· 62 9.2.1基本资料 ······················································································································ 62 9.2.2桩基础类型的选择 ······································································································ 62 9.2.3桩基估算 ······················································································································ 62 9.2.4 桩基础计算 ················································································································· 63 9.3 群桩基础验算 ·················································································································· 69 9.4 承台计算 ·························································································································· 70 9.4.1桩顶处的局部受压验算 ······························································································ 70

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毕业设计说明书

9.4.2 角桩向上冲切承台的冲切验算 ················································································· 71 9.4.3 边桩向上冲击承载力验算 ························································································· 72

10 结论 ·············································································································73 谢 辞·················································································································74 参考文献 ···········································································································75

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毕业设计说明书

摘 要

本次设计为某跨河大桥，根据《公路钢筋混凝土及预应力混凝土桥涵设计规范》（JTG D62-2004）的标准设计。在设计中基本上做到安全、经济、实用和美观等。

本毕业设计主要是关于大跨度预应力混凝土连续梁桥上部结构的设计，与同等跨径的简支梁桥相比，连续梁桥的截面控制弯矩得以减少，同时由于采用平衡悬臂施工方法，使桥梁单跨跨径得以增大，从而在近二十余年来连续梁桥得到广泛的应用。

在这次设计中由于结构本身为超静定结构，在内力计算方面采用了计算机辅助设计。利用桥梁博士V2.9和V3.03等对结构进行离散，并且做了结构的内力计算，在一定程度上提高了计算结果的准确性，为进一步的设计提供了方便；然后利用桥梁博士的结果进行下部结构设计。并且完成结构计算书一份，结构示意图、施工图等若干。

在这次设计过程中，运用了office办公软件、cad等制图软件和桥梁博士V2.9等结构设计软件。

关键词：预应力混凝土结构；桥梁设计；软件应用

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