摘要：本设计是关于公路预应力混凝土连续梁桥上部结构的设计，其孔径布置为30+50+30m，全长为110m。设计荷载为公路-Ⅰ级，桥面宽度为双向四车道（不设人行道）。箱梁高度跨中处为2m，支点处为3.8m。设计的主要内容为,尺寸的拟定及内力的计算，预应力钢束的各种验算。本设计使用国内著名的有限元软件——桥梁博士,全桥共有38个单元,39个节点。
过程中因为涉及到大量的数字的运算，采用计算机辅助来设计，因为用手算比较繁琐，准确性又得不到保证。设计中使用了桥梁博士来进行内力计算，以初步估算配筋量和进行初步验算。为了能提高设计的可靠性，还借用了Auto CAD辅助软件以及Excel电子表格来进行计算，使自己的设计能力有了较大提升。21020
毕业论文关键词： 连续梁桥；预应力；混凝土
Ying kou Liaohe River Bridge Design
Abstract：The design of highways prestressed concrete continuous beam bridge portion of the structure design, the aperture arranged 30 +50 +30 m, a total length of 110m. Design load for the road - Class Ⅰ, two-way four-lane bridge width (no sidewalk). Box girder span at the height of 2m, the fulcrum of 3.8m.The main content is designed to develop cross-sectional dimensions of the internal force calculations, estimates and configure the prestressing steel beams and cross-section of the checking. This design uses a well-known finite element analysis software - Dr. Bridges calculations, the full bridge is pided into 38 units, 39 section. Main beam with variable cross-section of the single-box single-chamber box section, symmetrical cantilever construction method pouring method.
Because the process involves a lot of number crunching, using hand calculations more complicated, and the accuracy can not be guaranteed, so the use of computer-aided design. Used in the design of the bridge to Dr. internal force calculation, and preliminary estimates and preliminary checking the amount of reinforcement. In order to improve design reliability, also borrowed Auto CAD software and Excel spreadsheets auxiliary calculations, make your own design capability has been greatly improved.
Key Words：Continuous bridge; prestressed; concrete
目 录
1 绪论 1
1.1 预应力混凝土连续梁桥的发展 1
1.2 预应力混凝土结构的特点 1
2 设计原始资料和主要技术指标 3
2.1 设计原始资料 3
2.2 主要技术指标 3
2.2.1 设计依据 3
2.2.2 主要材料 3
3 结构尺寸拟定 4
3.1 主跨径拟定 4
3.2 细部尺寸拟定 4
3.2.1 主梁梁高 4
3.2.2 截面尺寸 4
3.2.3 横隔梁 4
4 预应力混凝土连续梁桥内力计算 6
4.1 计算模型建立 6
4.1.1 桥梁博士概述 6
4.1.2 结构单元划分 6
4.2 计算参数 8
4.2.1 主梁及预应力钢筋的参数 8
4.2.2 冲击系数 8
4.2.3 二期恒载集度 9
4.3 设计荷载 9
4.4 作用效应组合 10
4.5 承载能力极限状态下的内力组合 13
4.6 内力包络图 15
5 预应力钢束配置及验算 16 营口辽河桥设计(30+50+30连续梁桥）+图纸:http://www.751com.cn/gongcheng/lunwen_13027.html