清泉引桥初步方案设计
摘要
本次毕业设计是跨径为329.2m的清泉引桥设计。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。本设计利用MIDAS CIVIL软件进行结构分析，根据桥梁的尺寸拟定建立桥梁基本模型，然后进行内力分析，计算配筋结果，进行施工各阶段分析及截面验算。同时，必须要考虑混凝土收缩、徐变次内力和温度次内力等因素的影响。本设计主要是预应力混凝土连续梁桥的上部结构设计，设计中主要进行了桥梁总体布置及结构尺寸拟定、桥梁荷载内力计算、桥梁预应力钢束的估算与布置、桥梁预应力损失及应力的验算、次内力的验算、内力组合验算、主梁截面应力验算，并绘制方案图及相关施工图。最后，经过分析验算表明该设计计算方法正确，内力分布合理，符合设计任务的要求。
关键字MIDAS CIVIL软件，预应力混凝土简支梁桥，结构分析，验算
Preliminary Design for Qing-quan Approach Bridge
ABSTRACT:
The title of this graduation design is the design of a approach bridge with the span of 430meters.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.This design using the dr bridge software analysis the structure, according to the size of the bridge, the basic model establishment bridge worked, then force analysis, calculation results of reinforced, for each phase analysis and construction. At the same time, must consider the concrete shrinkage, Creep force times and temperature resultant times factors.The design of prestressed concrete continuous girder bridge is mainly the upper structure design,in the design of the main bridge layout and structure size, load calculation, bridge prestressing tendons estimation and layout, the loss of prestress and stress of the bridge, the resultant checked, internal combination calculation, section stress calculation girder. At the mean while, we have to draw program figures and construction drawings.Finally, after analysis shows that the design calculation method of calculating the internal force distribution, reasonable, comply with the design requirements of the task.
KEY WORDS:MIDAS CIVIL software, Pre-stressed concrete continuous girder bridge, Structure analysis, Checking computation。
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