连续箱梁桥毕业设计.doc

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3×20m预应力混凝土连续箱梁分离式立交桥设计
摘 要本设计为3×2O米预应力混凝土连续箱梁分离式立交桥。由于设计要求上跨一条二级公路，因此选用互不影响直行交通的分离式立交桥。全桥为双向四车道，分左右两幅桥进行设计，单幅结构横向宽度为12m。全桥采用先简支后连续的方法进行施工。在设计过程中，首先进行尺寸拟定，然后计算荷载横向分配系数，出于安全性和简便性，根据横向分配系数决定出以边梁为例进行力组合并进行配筋计算,最后进行预应力损失及后期结构截面验算。
关键词 分离式立交桥,箱型梁，预应力混凝土，横向分配系数
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ABSTRACT
The design for the 3 × 20 meters of prestressed concrete continuous box girder separate overpass. Because a secondary road across the design requirements, so choose independently of each other direct transport of Separated Interchange. Full two-way four-lane bridge, at around two bridge design, single structure transverse width of 12m. Full-bridge using the first method simple and continuous support construction. In the design process, first, the size of the formulation, and then calculate the lateral load distribution coefficient, for security and simplicity, according to the lateral distribution coefficient to determine the side beams and an example of a bination of internal forces Reinforcement, Finally prestressing loss and post-structural cross-sectional checking.
Key Words: Separate overpass, Box girder, Prestressed concrete, Horizontal partition coefficient
目录
绪 论1

工程概况2
2
设计使用材料及相关参数 2
设计使用规 4
5
5
5
6
6
7
9
9
12
13
自重作用效应的计算 13
13
力计算 13
可变作用效应计算16
16
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21


26
28
30


计算结果32
5 预应力钢筋的估算与布置 34

34
34

6 预应力损失及有效预应力计算 38
预应力钢筋拉（锚下）控制应力38
钢束预应力损失 38


45
45
8 抗裂验算 49
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正截面抗裂验算 50