贵溪大桥上部结构设计毕业设计论文.doc

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6×36m,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:简支梁桥;预应力;挠度;抗裂性;
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 practical" principle, first , I came up with several programs pared 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 .
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 binations. 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, designing the horizontal partition beam and its reinforcement, drawing influence line and calculating the internal force. Finally , it is the design of the bridge deck and bearings.
Keywords: the beam bridge; prestressing force; Deflection; The anti-cracking;
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