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摘要：连续梁桥是一种常见的桥梁结构体系。它拥有变形小，结构刚度好，行车平顺舒适，伸缩缝少，抗震能力强，养护容易等优点，除此之外，连续梁桥造型简洁美观、设计及施工经验已经相当成熟。通过四跨连续梁桥的设计，能够掌握桥梁设计方法，进一步了解桥梁的一些专业知识，更深入的掌握了连续梁桥的设计过程和一些基础的施工过程和施工工艺。
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本设计的设计方案采用的是4跨一联预应力混凝土等截面连续梁结构，全长160 m。上部结构根据通行3个车道要求，采用单箱单室箱型梁，箱宽9 m，在跨中处顶板厚取30 cm，底板厚取40 cm，腹板厚取50 cm；支座处顶板厚取30 cm，底板厚取60 cm，腹板厚取70 cm的桥梁截面形式。本设计利用Midas进行设计和机算内力的，通过Midas得出本设计中的弯矩和剪力包络图进行设计配筋。该设计完成了桥梁上部结构设计和验算，并编制了毕业设计论文和相关图纸。最后经过验算符合相关设计规范的相关规定。23556
毕业论文关键词：四跨连续梁桥；Midas Civil；荷载内力计算。
30m +50 m +50 m +30 m four -span continuous girder bridge design
Abstract：Continuous bridge is a common bridge architecture. It has small deformation, structural stiffness, driving comfort comfortable, less joints, seismic capability, maintenance is easy, etc., in addition, continuous beam bridge modeling simple appearance, design and construction experience has been quite mature. Through the four -span continuous girder bridge design, bridge design methods can grasp a better understanding of some of the expertise of the bridge, a deeper grasp of the design process and some continuous beam bridge foundation construction process and construction process.
This design is used in the design of a cross- section of four prestressed concrete continuous beam structure, length of 160 m. Superstructure requirements based on the prevailing three -lane, single- box single chamber box girder, box width 9 m, in the span of the roof to take thick 30 cm, bottom thick taking 40cm, web thickness taken 50 cm; bearing plate thickness taken at 30 cm, take thick bottom 60 cm, take the bridge cross-section in the form of web thickness of 70 cm. This design uses design and machine operator Midas internal forces, by Midas draw the design moment and shear reinforcement design envelope. The design is completed the bridge superstructure design and checking, and the preparation of the graduation thesis design and related drawings. Finally, after checking compliance with the relevant provisions of the relevant design specifications .
Keywords :Four-span continuous bridge, Midas Civil, Internal force calculation load.
目录
1 绪论 1
1.1 梁桥的概念 1
1.2 国内外研究现状与水平 1
1.3 发展趋势 2
1.4 梁桥的优缺点及应用 2
1.5 Midas civil介绍 3
1.6 本设计主要内容 4
2 本桥型的总体结构布置 5
2.1主跨径的拟定 5
2.2主梁尺寸拟定 5
2.2.1主梁高度 5
2.2.2细部尺寸 5
2.3本桥主要材料 8
2.4桥梁设计荷载 8
2.4.1桥型设计及构造特点 8
2.4.2计算参数 8
2.5小结 9
3 荷载内力计算及计算主梁次内力 10
3.1荷载内力计算 10
3.1.1主梁内力计算 10
3.1.2 第二期恒载 12
3.2计算主梁次内力 14