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With the continuous improvement, improve and promote the use of the cantilever casting construction and cantilever erection construction method, In the span of 40 - 200 meters of the bridge, the continuous bridge gradually occupy a major position.The graduation designs, the main bridge across the river shipping Ⅲ planning, channel planning width of 160m, this method is particularly suited to the bridge.
The main contents of this design is the Su Zhou Xinjiaqiao design, the design was simply supported beam bridge, T-shaped steel and prestressed concrete girder bridge, recommend solutions for prestressed concrete continuous beam bridge.This design is (50 +75 +50) m prestressed concrete continuous beam bridge width of 37m,pided into two, only consider the design of a single.Beam using a single dual-chamber container box section, full beam is pided into 178 units, unit length is generally pided into 1m (special exception).Roof, floor, web thickness were unchanged.Due to the mechanical characteristics of multi-span continuous girder bridge, near the middle of the fulcrum to bear a greater negative moment, and then cross to bear in positive moment, the high beam with variable beam height, according to parabola the aesthetic effect of the bridge.Full-bridge is pided into 178 units symmetrically , the use of electrical computer program to calculate the constant live load as well as the construction phase of the internal forces.Then the internal forces are combined,After calculation of the whole bridge prestressed beam configuration, experience can meet the specification requirements.Due to continuous prestressed concrete beam bridge is statically indeterminate structure, hand calculations workload is relatively large, and difficult to ensure accuracy,so, using the finite element analysis software-MIDAS conducted, it not only improves the efficiency and accuracy is improved.
【Key words】Continuous Beam Bridge;Cantilever Construction;Prestress
目录
1 序言 1
2设计资料 2
2.1 工程概况 2
2.2 设计规范和标准 2
2.3 设计技术标准 3
2.3.1 设计荷载 3
2.3.2 设计车速 3
2.3.3 桥面横向布置 3
2.3.4 桥面坡度 3
2.3.5 结构抗震 3
2.3.6规划河道断面图 3
3 基本资料 4
3.1 工程地质 4
3.2 场地水文地质条件 5
4 桥型方案的比选 5
4.1 方案一：简支梁桥 5
4.1.1 设计思路 5
4.1.2 跨径划分和总体布置 5
4.2 方案二：T形钢构桥 6
4.2.1 设计思路 6
4.2.2 跨径划分和总体布置 6
4.3 方案三：连续梁桥方案 6
4.3.1 设计思路 6
4.3.2 跨径划分和总体布置 7
4.4 方案比较 7
4.5 总结 8
5 主要材料及桥梁整体布置 8
5.1 主要材料 8
5.1.1 混凝土 8
5.1.2 预应力钢索和普通钢筋 9
5.2 总体布置 9
5.2.1 桥梁平面布置 9
5.2.2 上部结构 9
5.2.3 下部结构 10
6 恒载及附加荷载计算 10