1、I 摘 要 本设计是根据设计任务书的要求和公路桥规 的规定 ， 对 国道 101沙河桥 进行方案比选和设计的。对该桥的设计，本着 “ 安全、经济、美观、实用 ” 的八字原则，本论文提出三 种不同的桥型方案进行比较和选择：方案一为预应力混凝土简支 板 桥，方案二为 预应力混凝土简支 T梁桥 ，方案三为 预应力混凝土简支箱形梁桥 。经由以上的八字原则以及设计施工等多方面考虑 ， 确定预应力混凝土 简支板桥 为推荐方案。 在设计中，桥梁上部结构的计算着重分析了桥梁在使用 过 程中恒载以及活载的作用，运用铰接板法求出活载横向分布系数，并运用最 不利 荷载法法进行活
2、载的 加载。进行了梁的配筋计算，估算了钢绞线的各种预应力损失，并进行预应力阶段和使用阶段主梁截面的强度和变形验算、锚固区局部强度验算和挠度的计算。 本设计全部图纸采用计算机辅助设计绘制，计算机编档、排版，打印出图及论文。 最后 ，翻译了一篇英文短文 “ Protecting steel superstructures”。 关键词： 预应力混凝土、简支 板 桥、 挠度 II Abstract This design is based on the requirements of the design specification and the rules
3、of Highway Bridge Regulation. National highway 101 Sha river bridge is compared and designed. In the bridge design, the principles are "safe, economy, beautiful and practical". This paper put forward three different kinds of bridge type to compare and select. Project 1 is a prestressed con
4、crete simply-supported slab bridge； project 2 is a prestressed concrete simply-supported T-beam bridge； project 3 is a prestressed concrete simply-supported box beam bridge. Through the above 8 principles and design construction, the prestressed concrete simply-supported slab bridge is selected. In
5、the design, the calculation of the bridge superstructure analyze stressly the dead load and live load of bridge in use, and the live load transverse distribution factors are calculated by Hinged panels method and the live load is calculated by maximum load design. The reinforcement of beam, all kind
6、s of prestress losses, strength and deformation of main beam in the prestress phase and use phase, local strength in anchorage zone and deflection are also calculated. All the papers and drawings are classified and protracted by computer, and then I have translated a essay named “Protecting steel superstructures” Keywords: prestressed concrete, simple supported slab bridge, deflection
