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
2、 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：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 of Highway Bridge Regulation. National highway 101 Sha riv
3、er 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 concrete simply-supported slab bridge; project 2 is a prestressed concr
4、ete 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 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
