论文总字数:34826字
摘 要
现今,中小跨径桥梁的数量在中国占绝大多数,其中混凝土梁桥由于其造价低廉,取材广泛,刚度较大,在我国广泛使用。有些梁桥由于受到地形以及交通的限制,必须设计成斜弯桥。其设计方法和设
计要点和直桥均有所不同。特别是在汽车荷载作用下弯桥将产生明显的弯扭耦合效应,使其设计的难度有所加大。故混凝土连续弯梁桥构造设计是一项复杂多变的工作,在进行箱梁结构设计时,对每一主要尺寸拟定,都要考虑结构受力的要求,和布置钢筋的构造要求,并采取适当的计算方法,对结构采取纵横向计算分析,以保证结构的安全性。本设计对梁桥施工过程进行了设计并对施工过程中注意的要点进行了详细说明,对成桥状态进行了验算,包括持久状况承载能力极限状态、正常使用极限状态以及短暂状况构件应力验算,验算结果表明本桥的强度、刚度以及稳定性均满足要求,符合规范的相关规定,达到桥梁设计的相关标准。
关键词:连续弯梁桥;混凝土梁桥;跨径;构造设计;支座
Structural Design of 3x22m Concrete Continuous Curved Girder Bridge
Summary
Nowadays, the number of small and medium span bridges is the majority in China, and the concrete beam bridge is widely used in our country because of its low cost, wide selection of material and large rigidity. Some bridges are designed to be skew curved bridges due to terrain and traffic constraints. The design methods and design points are different from those of straight bridges. Especially under the action of vehicle load, the curved bridge will produce an obvious coupling effect of bending and torsion, making it more difficult to design.The structural design of concrete continuous curved beam bridges is a complex and varied work. When designing box girder structures, each major dimension shall be determined, the requirements of the structural forces shall be taken into account, and the structural requirements for the arrangement of the reinforcing steel shall be taken and appropriate. The calculation method adopts vertical and horizontal calculation and analysis on the structure to ensure the safety of the structure. In this design, the construction process of beam bridge is designed and the main points of attention in the construction process are explained in detail. The checking calculation is carried out on the state of the bridge, including the limit state of the endurance capacity, the normal use limit state and the stress checking calculation of the transient state component, and the checking results show the strength, stiffness and stability of the bridge. All of them meet the requirements and meet the relevant requirements of the specifications to meet the relevant standards of bridge design.
Keywords: continuous curved beam bridge; reinforcement concrete bridge; span; structural design; bearing
目录
第一章 概述 1
1.1 设计资料 1
1.2 技术标准 1
1.3 地质条件 1
1.4材料选用 2
1.4.1混凝土: 2
1.4.2钢筋 2
1.5参考设计规范 2
第二章 3x22米混凝土连续弯梁桥构造设计 3
2.1总体设计 3
2.1.1方案布置图 3
2.1.2材料使用表 3
2.2主梁设计 4
2.2.1截面形式 4
2.2.2 主梁材料 4
2.2.3 截面细部尺寸 4
2.2.4 钢筋布置 5
2.3下部结构设计 6
第三章 全桥计算模型及计算荷载 8
3.1 全桥计算模型 8
3.2 施工阶段模拟 8
3.3 计算荷载 9
第四章 成桥阶段计算 10
4.1 荷载组合及控制要求 10
4.1.1 荷载组合 10
4.1.2荷载工况及荷载组合 10
4.1.2内力计算 12
4.1.3 控制要求 18
第五章 持久状况承载能力极限状态验算结果 20
5.1 截面受压区高度 20
5.2 正截面抗弯承载能力验算 20
5.3 斜截面抗剪承载能力验算 22
5.4 支反力计算 26
第六章 持久状况正常使用极限状态验算结果 27
6.1 裂缝宽度验算 27
6.2 结构挠度验算 29
6.3结构刚度分析 29
第七章 短暂状况构件应力验算 31
7.1受拉区钢筋拉应力验算 31
7.2 短暂状况混凝土梁的应力验算 32
第八章 施工设计 35
参考文献 38
致 谢 37
第一章 概述
1.1 设计资料
桥位地形、地质剖面图
图1.1-1 桥位地形、地质剖面图
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