毕业设计（论文）报告纸
目 录
第一章 概述 ·····························4
1.1 地质条件···························4 1.2 主要技术指标·························4 1.3 设计规范及标准························4 第二章 方案比选······························5
2.1 概述·····························5 2.2 比选原则···························5 2.3 比选方案···························5
2.3.1 预应力混凝土连续梁桥 ··················5 2.3.2 预应力混凝土连续刚桥桥 ·················7 2.3.3 普通上承式拱桥 ·····················8 2.4 方案比较···························9 第三章 预应力混凝土连续梁桥总体布置 ·················12
3.1 桥型布置···························12 3.2 桥孔布置···························12 3.3 桥梁上部结构尺寸拟定·····················12 3.4 桥梁下部结构尺寸拟定·····················13 3.5 本桥使用材料·························14 3.6 毛界面几何特性计算······················14 第四章 荷载内力计算 ·························16
4.1 模型简介···························16 4.2 全桥结构单元的划分······················16
4.2.1 划分单元原则 ······················16 4.2.2 桥梁具体单元划分 ····················17 4.3 全桥施工节段的划分······················17
4.3.1 桥梁划分施工分段原则 ··················17 4.3.2 施工分段划分 ······················17 4.4 恒载、活载内力计算······················17
4.4.1 恒载内力计算· ·····················17 4.4.2 悬臂浇筑阶段内力 ····················18
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毕业设计（论文）报告纸
4.4.3 边跨合龙阶段内力 ····················19 4.4.4 中跨合龙阶段内力 ····················20 4.4.5 活载内力计算 ······················21 4.5 其他因素引起的内力计算····················23
4.5.1 温度引起的内力计算 ···················23 4.5.2 支座沉降引起的内力计算 ·················25 4.5.3 收缩、徐变引起的内力计算 ················26 4.6 内力组合···························28
4.6.1 正常使用极限状态的内力组合 ···············28 4.6.2 承载能力极限状态的内力组合 ···············29
第五章 预应力钢束的估算与布置 ····················32
5.1 钢束估算···························32
5.1.1 按承载能力极限计算时满足正截面强度要求 ·········32 5.1.2 按正常使用极限状态的应力要求计算 ············33 5.2 预应力钢束布置························39 5.3 预应力损失计算························40
5.3.1 预应力与管道壁间摩擦引起的应力损失 ···········40 5.3.2 锚具变形、钢筋回缩和接缝压缩引起的应力损失········41 5.3.3 混凝土的弹性压缩引起的应力损失 ·············41 5.3.4 钢筋松弛引起的应力损失 ·················42 5.3.5 混凝土收缩徐变引起的应力损失 ··············42 5.3.6 有效预应力计算 ·····················44 5.4 预应力计算··························45 第六章 强度验算 ···························48
6.1 正截面承载能力验算······················48 6.2 斜截面承载能力验算······················51 第七章 应力验算 ···························55
7.1 短暂状况预应力混凝土受弯构件应力验算·············55
7.1.1 压应力验算 ·······················55 7.1.2 拉应力验算 ·······················55 7.2 持久状况正常使用极限状态应力验算 ··············60
7.2.1 持久状况(使用阶段)预应力混凝土受压区混凝土最大压应力验算 60 7.2.2 持久状况(使用阶段)混凝土的主压应力验算 ·········62 7.2.3 持久状况(使用阶段)预应力钢筋拉应力验算 ·········65
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毕业设计（论文）报告纸
第八章 抗裂验算 ···························68
8.1 正截面抗裂验算························68 8.2 斜截面抗裂验算························72 致谢 ·································77 参考文献································78 附录：外文翻译 ····························79
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