1、 I 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、实用”的原则，先拟定 几个方案进行比选。最终，决定采用预应力混凝土简支梁桥为方案进行上部结 构设计。设计桥梁跨度为 636m，桥面宽度为 19m，双向四车道。T 形主梁采用 预制安装。 设计过程如下：首先，确定主梁主要构造及细部尺寸，它必须与桥梁的规 定和施工保持一致。其次，设计行车道板，计算恒载和汽车荷载内力组合。再 次，计算主梁内力、计算预应力筋面积及其布置计算预应力损失，然后进行应 力、抗裂性验算和主梁挠度与锚固区局部承压计算。再者，横隔梁的设计及其 配筋，绘制
2、影响线及计算内力。最后，就是桥面结构和支座的设计。 关键词：关键词：简支梁桥；预应力；挠度；抗裂性； II 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 practica
3、l“ 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
4、 . 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,
