桥梁博士毕业设计电子版

摘 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()252525++m 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，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：预应力混凝土 简支变连续梁桥 结构设计AbstractThis 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 bridge 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-supported into continuous girder bridge is determined as the recommended project, and a detailed design is carried out on the project named ()++m the variable constant section prestressed concrete continuous beam 252525bridge.Structure dimensions of main girder is drew up by resourcing and referring to the 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 distributing 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目录摘要 ----------------------------------------------------------------------------------------------- I Abstract ------------------------------------------------------------------------------------ II 第一章设计基本资料与主要技术指标---------------------------------------------------- 51.1工程概况： ---------------------------------------------------------------------------- 51.2 设计技术标准： --------------------------------------------------------------------- 51.3 有关设计资料： --------------------------------------------------------------------- 51.4 基本计算数据： --------------------------------------------------------------------- 6第二章桥型方案比选 ------------------------------------------------------------------------- 72.1 桥梁设计原则 ------------------------------------------------------------------------ 72.2 桥型方案 ------------------------------------------------------------------------------ 72.3方案比选 ------------------------------------------------------------------------------ 10第三章主梁截面尺寸的拟定--------------------------------------------------------------- 113.1 设计特点 ----------------------------------------------------------------------------- 113.2 主梁间距与主梁片数------------------------------------------------------------- 113.3 主梁细部尺寸拟定 ----------------------------------------------------------------- 113.4 横隔梁设计------------------------------------------------------------------------- 123.5 截面几何特性 ----------------------------------------------------------------------- 12第四章主梁作用效应计算 ------------------------------------------------------------------ 154.1 单元的划分 -------------------------------------------------------------------------- 154.2 施工阶段的划分 -------------------------------------------------------------------- 164.3 恒载内力的计算 -------------------------------------------------------------------- 184.4活载内力的计算 --------------------------------------------------------------------- 264.2.1 横向分布系数计算------------------------------------- 26 4.2.2 冲击系数和车道折减系数------------------------------- 28 4.5 内力组合 ------------------------------------------------------------------------------ 34 第五章 预应力钢束估算及布置 ------------------------------------------------------------ 465.1 钢束估算 ----------------------------------------------------------------------------- 465.1.1 按正常使用极限状态的正截面抗裂验算要求估束------------ 46 5.2. 按承载能力极限状态截面压应力要求估算------------------- 48第六章 预应力损失计算 --------------------------------------------------------------------- 521 基本理论-------------------------------------------------- 52 6.2 预应力损失计算------------------------------------------ 52 6.2.1后张法由预应力钢筋与管道之间摩擦引起的应力损失1s σ -----526.2.2后张法由锚具变形、钢筋回缩和接缝压缩引起的预应力损失2s σ------------------------------------------------------------ 53 6.2.3后张法由混凝土弹性压缩引起的应力损失4s σ --------------- 536.2.4后张法由钢筋松弛引起的预应力损失终极值5s σ------------- 53 6.2.5后张法由混凝土收缩、徐变引起的预应力损失6s σ----------- 54第七章 强度、应力与变形验算---------------------------------------- 577.1 强度计算与验算 -------------------------------------------------------------------- 57 7.2 截面承载能力极限状态验算 ----------------------------------------------------- 60 7.3 截面正常使用极限状态验算 ----------------------------------------------------- 62第一章 设计基本资料与主要技术指标1.1工程概况：西河大桥位于四川省南充市西山风景开发区。