以下是土木毕设网小编为大家搜集整理的大桥桥型方案设计论文摘要范文，供大家参考和借鉴!
摘要：本设计是根据设计任务书的要求和《公路桥规》的规定对沅江阁老大桥进行方案比选和设计。对该桥的设计，本着“安全、实用、经济、美观”的八字原则，本设计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连续梁桥，方案二为预应力连续刚构桥，方案三为独塔斜拉桥。经由以上原则以及设计施工等诸多方面考虑后，确定预应力混凝土连续梁桥为最终设计方案。
本预应力混凝土连续梁桥共分为三跨（70m+110m+70m）主跨110m，边跨对称70m；主梁采用单箱双室预应力混凝土箱梁，跨中梁高为2.6m，支座处梁高为6.5m，截面高度按二次抛物线形式变化；桥面净宽为24m；设计荷载为公路-Ⅰ级。
在设计中，运用了桥梁设计软件桥梁博士建立引桥模型，并对桥梁恒载、活载及徐变内力进行分析计算，得出预应力钢束的预估值。最后对引桥的应力、变形等进行验算。经分析比较及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
关键词：预应力混凝土；箱梁；变截面连续梁；桥梁博士
Yuan Jiang Gelao Bridge Design-based General Information
Abstract:The design is based on the requirements of the design task and"yuan jiang gelao Bridge Regulation".The design of the bridge is carried out in the eight-character principle of"safety,pratically,economically and aeshetic"by comparing and choosing the best one.The first program is continous prestressed concrete grider bridge,the second one the continous prestressed concrete rigid frame,and the third one is the single pylon cable-stayed bridge.Accdoding to the above principles and construction factors,the continous prestressed concrete grider bridge is chosen to the ultimate.
The continous prestressed concrete grider bridge is divided into three inters,(70m+110m+70m),with the main span of 110m,and 70m-symmetry one.Prestressed concrete box grider is used as the main beam;the beam depth in the mid-span is 2.6m,while at the support bearing it is 6.5m.The sectional depth is changed in the form of parabolic.The net width of the deck is 24m,and the design load is for the way-I.
In the design,the bridge design software Bridge Doctor is used to get the calculation model.By analyzing and computing the dead load,live load and internal force,the estimated value of the prestressed strand is got.Finally,checking calculation is carried out to the stress and deformation of the main beam.The results of the analysis and checking calculation show that the design calculation method is correct,and the internal force distribution is reasonable to the design task.
Key words:prestressed concrete;box-girder;non-uniform continuous beam;Bridge Doctor
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