1、 I 摘摘 要要 这次毕业设计是针对西河大桥的四车道方案进行初步设计， 结合桥址处的地 质条件、设计基本要求与主要技术标准，拟定了等截面预应力混凝土简支变连续 梁桥、连续 T 梁桥、简支板桥方案，经过桥型方案比选，最终选定等截面预应 力混凝土简支变连续梁桥作为推荐方案， 并对252525m 等截面预应力混凝 土简支变连续梁桥方案进行了详细设计。 通过查阅资料和参考相关成桥经验数据拟定主梁结构尺寸，利用桥梁博士 V3.0 对主梁结构进行一次成桥和施工成桥内力分析，根据分析结果进行估束， 并经过配束、调束确定预应力钢束的数量与布置形式。根据配筋结果对主梁结构 进行应力、内力计算组合和强度、抗裂验算
2、，根据结果表明主梁结构满足设计要 求。在设计过程中，按照设计要求同时进行工程图绘制。 关键词关键词：预应力混凝土 简支变连续梁桥 结构设计 II Abstract This graduation design of four-lane of the West River Bridge is presented in this paper. According to geological conditions in the bridge site, basic requirements of designing and principal technical standards, three b
3、ridge projects have been drawn up. The first program is the Section of prestressed concrete simply-supported into continuous girder bridge. The second program is the Continuous T beam bridge. The third program is Simply supported slab bridge. Ultimately, the Section of prestressed concrete simply-su
4、pported into continuous girder bridge is determined as the recommended project, and a detailed design is carried out on the project named 252525m the variable constant section prestressed concrete continuous beam bridge. Structure dimensions of main girder is drew up by resourcing and referring to t
5、he correlated experience data, and the internal force analysis of one time forming bridge and construction forming bridge of main girder is carried on by DoctorBridge V3.0. Quantity of prestress wire is estimated according to the analysis results, amount and layout types are fixed through distributi
6、ng and adjusting prestress wire. Calculation of stress and internal force and checking of strength and crack-resistance are based on the distribution results, designing and computing of piers are based on the construction water level, and the results show that both main girder and substructure meet the designing requirements. Protacting of engineering drawings is progressed during the designing. Keyword: prestressed concrete a continuous girder bridge architectural design 目目 录录 III 摘
