T形预应力钢筋混凝土简支梁桥上部结构设计嘿嘿预案.doc

摘 要 本设计是根据设计任务书的要求和《公路桥规》的规定进行方案比选和设计的。本桥共一跨，标准跨径长为24m,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梁桥，方案二为斜腿刚构桥。方案三是预应力混凝土T形刚构桥，经由以上的八字原则以及设计施工等多方面考虑、比较确定预应力混凝土简支梁桥为推荐方案。 在设计中，桥梁上部结构的计算着重分析了桥梁在使用工程中恒载以及活载的作用利，采用整体的体积以及自重系数，荷载集度进行恒载内力的计算。运用杠杆原理法、偏心压力法求出活载横向分布系数，并运用最大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。 本设计全部设计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。还有，翻译了一篇英文短文“Bridges”。 关键词：桥梁设计、预应力混凝土、简支梁桥、 上部结构、AutoCAD。 Abstract This is a partial struct design of a flyover crossing that is over the railway in , according to designing assignment and the standard of road and bridge. The total of a bridge span, standard span length of 24m.For the purpose of make the type of the bridge corresponding with the ambience and cost saving, this paper provides three different types of bridge for selection: the first one is pre-stressed concrete continuous bridge; the second one is slant leggedrigid frame brige; the last one is Prestressed concrete t-shaped rigid frame bridge. After the comparisons of economy, appearance, characteristic under the strength and effect, the first one is selected. In the design, the calculation of bridge upper structure bridge is analyzed emphatically in the use of engineering zhongheng load and live load effect, the overall volume and weight coefficient, load set the calculation of internal force of dead load. Using the lever principl method, eccentric-pressed method live load transverse distribution coefficient, and using the method of maximum load method for load live load. The beam reinforcement calculation, estimate the various loss of prestress steel strand, prestressed stage and using stage of main girder section and the strength and deformation calculation of anchorage zones and local strength calculation and the calculation of the deflection. This design all design drawings using cad drawing, filing, computer typesetting, figure and print out the papers. Also, an e