摘要根据设计任务书要求和设计规范,毕业设计主要是小跨度预应力混凝土连续箱型梁桥上部结构的设计。箱形截面能适应多种使用条件,特别适合于预应力混凝土连续梁桥、变宽度桥。箱梁有较大的抗扭刚度,应力值较低,徐变变形较小。本着“安全、经济、美观、实用”八字原则。该桥分为5片、3跨,每跨35m,上部结构为连续梁。本桥采用分离式路基,设计时只考虑半面路基。施工方法为预制箱梁法。73074
上部构造的计算按箱梁截面,对3×35m跨径进行了单元划分,计算活载和恒载内力,全桥均采用MIDAS软件进行了预应力钢束配筋和应力验算,且按新规范计算了预应力损失。
毕业论文关键词: 预应力混凝土连续箱型梁桥 箱梁截面
Abstract According to the design task requirements and design specifications, the graduation design is mainly the design of the superstructure of the small span prestressed concrete continuous box girder bridge。 Box section can adapt to a variety of conditions of use, especially for prestressed concrete continuous beam bridge, variable width bridge。 The box girder has a large torsional rigidity, a lower stress value and a smaller creep deformation。 In the "safe, economic, beautiful, practical" character principle。 The bridge is pided into five, three spans, each spanning 35m, the upper structure for the continuous beam。 The bridge uses a separate subgrade, the design only consider half of the roadbed。 The construction method is prefabricated box girder method。
The calculation of the upper structure is based on the box beam section, and the 3 × 35m span is pided into units。 The load and dead load are calculated。 The full bridge uses MIDAS software to carry out prestressed steel beam reinforcement and stress checking, and according to the new specification Calculate the prestress loss。
Key words: prestressed concrete continuous box girder bridge girder section
摘 要 1
1。 绪论 3
1。1 预应力混凝土连续预制箱梁桥概述 3
1。2毕业设计的目的与意义 5
2。设计资料 6
2。1 桥梁概况 6
2。2 设计参数 6
2。3 技术条件 6
2。4 设计要求 7
2。5 规范标准 7
3。桥跨总体布置及结构尺寸拟定 8
3。1 本桥主料材料 8
3。2尺寸拟定 9
3。3 桥孔分跨 9
3。4 截面形式 9
3。4。1 立截面 10
3。4。2 横截面 10
3。5梁高 11
3。6截面尺寸 11
4。荷载计算 14
4。1主梁分段与施工方法 14
4。1。1分段原则 14
4。1。2具体分段 14
4。1。3主梁施工方法及注意事项 14
4。2计算模型 15
4。3恒载内力计算 16
4。4移动荷载作用效应计算