桥梁工程毕业设计正文预应力先简支后连续T梁桥设计.docVIP

摘 要 本设计为本科学士学位毕业论文，对重庆-长沙一级公路大桥新田湾大桥进行方案比选和设计。根据“安全、经济、美观、实用”的设计原则，本论文提出三种不同的桥型方案进行比选择：方案一为预应力混凝土简支梁桥，方案二为预应力混凝土连续梁桥、方案三为预应力混凝土先简支后连续梁桥。经充分考虑桥址控制因素，施工条件,通航等多方面实际因素，最终比较采用全桥长335m，桥宽为12.25m，主桥跨径为8×40m预应力先简支后连续T梁桥方案。下部结构采用矩形实体、实心墩、双柱墩、嵌岩桩和群桩基础，采用盆式橡胶支座。 本设计采用MIDAS程序进行桥梁建模及施工、荷载情况的模拟。在设计中，桥梁上部结构的计算着重分析了桥梁在使用工程中恒载以及活载的作用，采用整体的体积以及自重系数，荷载集度进行恒载内力，活载内力的计算，并进行了荷载的组合。进行了梁的配筋计算，估算了预应力钢绞线的各种损失，并进行预应力阶段和使用阶段主梁截面的强度、变形验算和全桥应力的验算。下部结构采用矩形实体、实心墩、双柱墩、嵌岩桩和群桩基础，采用盆式橡胶支座。 本设计是根据设计任务书的要求和新《公路桥规》相关规定进行设计的,设计中桥梁上下部结构合理严谨，方法准确，并且设计中得出的数据精确到了小数点后四位。本设计全部设计图纸采用CAD辅助设计绘制，计算机编档、排版，打印出图及论文。 关键词：自重系数 荷载集度 预应力 实心墩 Abstract This design for undergraduate course bachelor degree graduation thesis . For the purpose of make the type of the bridge corresponding with the ambience and cost saving, this paper provides three different types of bridge for selection: the first one is pre-stressed concrete beam bridge ; the second one is pre-stressed concrete continuous girder bridge and the third one is Simply following the continuous girder bridge .After the comparisons of economy, appearance, characteristic under the strength and effect, entire bridge long 335m, the bridge width is 12.25m, the8×40m Simply following the continuous girder bridge is selected. Substructure rectangular entity, a solid pier, double-column pier, in the rock piles and piles, using pots of rubber bearings. MIDAS the design process using modeling and bridge construction, load simulation. In the design, the bridge superstructure calculated focused on analysis of the bridge project in the use of dead load and live load role used and the size of the overall respect factor, load Set conduct constant Load and Live Load calculation, and the load combination. The beam reinforcement, estimated the various strands loss and the use of pre-stressed stage and the stage of the main beam intensity, deformation and checking the entire bridge stress checking. Substructure rectangular entity, a solid pier