毕业设计论文贵溪大桥上部结构设计.doc

摘 要 贵溪大桥位于江西省贵溪市，跨越信江。本次设计的课题是贵溪大桥上部结构设计。对该桥的设计，本着安全、经济、美观 Abstract Guixi bridge is located at Guixi,Jiangxi Province. The bridge across the river of Xin jiang . This design topic is the superstructure design of Guixi bridge, when designing the bridge, with the security, economic, aesthetic and practical principle, first , I came up with several programs and compared with them . Ultimately, I decided to adopt prestressed concrete beam bridge for the design of superstructure. The span of bridge is 216m, and the width of bridge is 19m, two-way. The T-shaped main girders are prefabricated and set up . Design process are as follows: first, designing the structure and detail size of main girders, it must be consistent with the rules and regulations of the construction . Secondly, designing the roadway , calculating constant load and automobile load combinations. Again, calculating the internal force, calculating prestressed girder and its layout area and the loss of prestress, then calculating the stress and the anti-cracking , deflection of girder and pressure of anchorage zone . Moreover, designing the horizontal partition beam and its reinforcement, drawing influence line and calculating the internal force. Finally , it is the design of the bridge deck and bearings. Keywords: the beam bridge; prestressing force; Deflection; The anti-cracking; 目录 第一章 基本资料 1 1.1 概况 1 1.1.1 地质条件 1 1.1.2 水文条件 1 1.1.3 气象条件 1 1.2 主要设计技术标准 2 第二章 方案比选 3 2.1 比选方案的主要标准 3 2.2 方案编制 3 2.3 方案比选 4 第三章 主梁设计 5 3.1 设计资料 5 3.2 横截面布置 7 3.2.1 主梁间距和主梁片数 7 3.2.2 主梁跨中截面细部尺寸 8 3.3 梁毛截面几何特性计算 9 3.3.1 截面几何特性 9 3.3.2 检验截面效率指标ρ 11 第四章 行车道板计算 12 4.1 恒载及其内力 12 4.2 汽车荷载产生的内力 12 4.3 内力组合 14 第五章 主梁内力计算及配筋 15 5.1 恒载内力计算 15 5.2 主梁活载横向分布系数计算 18 5.2.1 跨中的横向分布系数mc 18 5.2.2 支点的荷载横向分布系数 24 5.2.3 横向分布系数汇总 25 5.3 活载内力计算 26 5.3.1 主梁跨中截面弯矩及剪力 26 5.3.2 主梁L/4截面弯矩 28 5.3.3 主梁支点截面剪力 29 5.4 主梁内力组合 31 5.5 预应力钢束的估算及其布置 33 5.5.1 跨中截面钢束的估算及确定 33 5.5.2 预应力钢束的布置 34 5.5.3 非预应力钢筋截面积估算及布置 38 5.6 主梁截面几何特性计算 39 5.7 持久状况截面承载能力极限状态计算 41 5.7