毕设基本摘要
摘 要
本次毕业设计的题目是梅州市龙港大桥施工图设计，专题题目是主跨40m的连续梁桥设计。依据《公路桥涵通用设计规范 JTG D60—2004》和《公路钢筋混凝土及预应力混凝土桥涵设计规范JTG D62—2004》，通过综合运用所学过的基础理论及专业知识，独立进行桥梁设计。
首先，根据地形图提出三种桥型比较方案。然后从外观、施工难易程度和造价等多方面考虑，最终选出最优方案。
其次，就是进行比选的最优方案,即跨径组合为40m+40m+40m+40m预应力混凝土连续梁桥的设计。在结构设计中，梁截面采用变化的单箱双室截面，截面高度在全桥范围内均为两米，为等截面连续梁桥。主梁采用先简支后连续的施工方法。
最后，利用桥梁博士建模,输入材料特性、截面形状等结构信息，然后用桥梁博士报告模板输出每个截面的所需的钢筋面积，以此来布置预应力钢束。可以根据桥梁博士输出的施工内力、活载内力、长（短）期效应组合验算、钢束验算等报告整理计算书，并绘制方案图及相关施工图。
关键词： 连续梁桥； 等截面； 先简支后连续； 桥梁博士
Abstract
The title of this graduation design is the design of the Longgang bridge.The special title is the design of a continuous bridge with the main span of 40 meters.According to 《The Common Specification of Highway Bridge and Culvert JTG D60-2004》and 《Specifications for Design of Reinforced Concrete and Prestressed Concrete Highway Bridges and Culverts JTG D62-2004》，we have to design the bridge independently with the use of the knowledge of basic theory and profession lesson.
The first step is to give three types of the bridge according to topograohic map.then according to the comparison from the appearance,the degree of construction difficulties and construction cost and so on ,we choose the best suitable type.
The second step is to design the chosen type ,which is a continuous prestressed concrete bridge with a combination of long-span for 40m+40m+40m+40m.In structure design,the se- ction of beam adopts double room and box.The height of the beam is 2 meters all through the bridge. The continuous bridge after simply supported is adopted in this bridge construction.
The last step is is to set up a modle with DrBridge ,then import the exact imformation of the construction,such as characters of materials、the shape of sections,to export the sheet of the area of steel tendons which the section of each unit needs .then we can arrange the steel tendon correctly. Then we can finish the calculation book ,according to the construction internal force,the live load internal force,the long(short) effect combination and the checking calculation of the steel tendons given by DrBridge.At the mean while, we have to draw program figures and construction drawings.
Keywords： Continuous beam bridge; Uniform beam; Continuous bridge after simply supported; Doctor Bridge
设计跨径：4×40m
净宽：16m
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