摘要连续梁桥是工程上广泛使用的一种桥型,它不但具有可靠的强度,刚度及抗裂性,而且具有行车舒适平稳,养护工作量小,设计及施工经验成熟的特点。设计一座梁桥必须从桥跨布设,尺寸拟定,钢束布置以及施工方法等方面综合考虑,还要充分考虑设计参数和环境影响。本设计主桥是一联三跨连续梁桥，截面形式为单箱三室，纵向变截面；施工方式是悬臂施工。该设计首先进行恒载、活载及次内力的计算,在此基础上进行荷载组合,绘制弯矩和剪力包络图；其次,根据短期效应组合配置预应力钢筋，并进行预应力损失的计算；最后，对该连续梁桥进行验算，是否满足设计要求。73737

毕业论文关键词： 连续梁桥  悬臂施工  预应力

Abstract The continuous beam bridge is a kind of bridge type used widely on the project。 It not only has a reliable strength, stiffness and cracking, but also has a smooth journey comfortable, conservation work on the design and construction experience of the characteristics of maturity。 Design a bridge must be laid across from the bridge-laying, the size of the development, steel beam layout and construction methods, but also give full consideration to the design parameters and environmental impact。 The design of the main bridge is a three-span continuous beam bridge, Cross-section in the form of single-box three-room, and Construction method is cantilever construction。 The first design includes constant load, the live load and the calculation of the internal forces。 On the basis of a load combination, we can draw moment and shear envelope map。 Next, according to the short-term effect combination disposition prestressed reinforcement, and carries on the loss of prestress the computation。 Finally, carries on the checking calculation to this continuous bridge, whether to satisfy the design requirements。

Key Words: continuous bridge; full framing; prestress

目 录

Abstract 3

1 绪论 6

1。1 设计的目的与要求 6

1。1。1 目的 6

1。1。2 要求 6

1。2 1。2预应力混凝土连续梁桥概述 6

2 设计依据 8

2。1 设计依据 8

2。2 技术标准 8

2。3 地质资料 9

2。4 主要材料 9

2。4。1 混凝土 9

2。4。2 低松弛钢绞线 10

2。5 采用规范 10

3 桥型方案比选 10

3。1 构思宗旨 10

3。2 比选标准 11

3。3 比选方案 11

3。3。1 方案一：简支梁桥方案 11

3。3。2 方案二：中承式钢管混凝土拱桥方案 11

3。3。3 方案三：连续梁桥方案 11

3。4 方案点评 11

4 总体布置及主要尺寸 12

4。1 尺寸拟定 12

4。1。1 桥孔分跨 13

4。1。2 截面形式