30米预应力砼t梁梁桥设计毕设论文.doc

摘 要 本设计是钢筋混凝土T型梁桥，我国的桥梁结构中多数都是使用T型桥梁。因为这种设计有它的很多的优点，它能够大大的实现资源的优化配置，能有效的发挥材料的性能，充分利用材料的作用；它能大大的降低成本，机械化操纵，节省工期；有利于就地取材。桥梁美观好看，坚实耐用。 我国如今利用最为遍及的还是钢筋混凝土简支梁桥。这类设计方案在我国中、小型桥梁设计中普遍存在。因为这种设计有它的很多的优点，它能够大大的实现资源的优化配置，能有效的发挥材料的性能，充分利用材料的作用；机械化操纵，收缩工程工期，提高效率；所以在公路中小跨钢筋混凝土简支梁桥有的优势和广阔的应用前景。结合的理论和实践独立履行任务能力,并帮助学生综合能力。Is the design of reinforced concrete T beam bridge, the bridge structure are mostly used in T bridge. Because this kind of design has its many advantages, it can greatly to achieve the optimal allocation of resources, can effectively play the performance of the material, make full use of the role of material; It can greatly reduce the cost, mechanical manipulation, save the time limit for a project; For local materials. The bridge is beautiful beautiful, solid and durable. This design under the guidance of the teacher carefully, with the help of the classmates, after repeated calculation exercises and field study, but also through their continuous learning, consult the professional norms books, I have improved in many aspects. Through this design realize the theoretical knowledge of students in the class if you cant apply into practice, it all becomes a paper empty talk, full use of their students learn professional knowledge, with solid again Practice to combine the theory and practice to help students improve the effectiveness of fulfilling tasks independently, and help students to improve the comprehensive ability. Key words: simply supported girder bridge; Standard models; Bridge design. Modeling design; 目 录 摘 要 1 Abstract 2 目 录 3 前 言 3 第一章 桥梁方案比较选择 1 1.1 桥梁方案比选原则 1 1.2桥型特点 2 第二章 桥梁设计基本资料 4 2.1地质条件 4 2.1.1地质层资料 4 2.2工程地质评价 4 第三章 上部结构 6 3.1 主要设计材料参数 6 3.2横截面布置 6 3.2.1主梁间距和主梁片数 6 2.2.2主梁跨中截面尺寸拟订 7 第三章 主梁作用效应计算 11 3.1永久作用效应计算 11 3.1.1永久作用集度 11 3.2可变作用效应计算 14 3.2.1冲击系数和车道折减系数 14 3.2.2计算主梁的荷载横向分布系数 14 3.2.3车道荷载的取值 19 3.2.4 计算可变作用效应 19 3.3 主梁作用效应组合 23 第四章 预应力钢束的估算及其布置 24 4.1 跨中截面钢束的估算和确定 24 4.1.1按正常使用极限状态的应力要求估算钢