资源描述：
《预应力空心板桥桥梁毕业设计》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、摘要本次设计桥梁类型为预应力混凝土连续梁桥，预应力混凝土连续梁是现在广泛使用的一种体系，主要适用于大跨度梁桥。它具有变形小，结构刚度好，行车平顺舒适，伸缩缝少，养护简易，抗震能力强等优点。而且采用了预应力筋，增加预应力筋能充分发挥高强材料的特性，具有可靠的强度、刚度和抗裂性能，耐久性强，材料可塑性强，便于建筑艺术处理，也容易满足桥梁曲线和坡度的要求。当桥跨增大时，在荷载作用下，连续梁桥的中间节点截面处将承受较大的负弯矩，从绝对值来看，支点负弯矩远大于跨中正弯矩。采用变截面梁（支点处梁高增大，跨中梁高减小，其间按曲线或折线过渡）
2、更能适用结构的内力分布规律。常采用悬臂法施工，变截面梁的受力状态与其施工时的内力状态基本吻合，更适用于大跨度预应力混凝土连续梁桥，其外形和谐，节省材料并可增大桥下净空，是大跨度桥梁的优选方案。 本设计包括上部结构布置、梁恒载内力计算、主梁的活载内力计算、确定钢筋面积、预应力损失计算、空心板短暂和持久状态应力验算等。本设计题目为：三跨预应力混凝土空心板型连续梁桥。它具有变形小，结构刚度好，行车平顺舒适，伸缩缝少，养护简易，抗震能力强等优点。而且采用了预应力筋，增加预应力筋能充分发挥高强材料的特性，具有可靠的强度、刚度和抗裂性能，
3、耐久性强，材料可塑性强，便于建筑艺术处理，也容易满足桥梁曲线和坡度的要求。 关键词：预应力,内力计算,配筋,验算ABSTRACTThedesignforprestressedconcretecontinuousgirderbridgetypes,prestressedconcrete continuous beam is now widely used a system, mainly is suitable for the large span bridge. It has little deformation, struc
4、ture stiffness, driving smooth and comfortable, less expansion joints, easy maintenance, seismic ability, etc. And the tendons, increase tendons that can give full play to the characteristics of the high strength materials with reliable strength, stiffness and crack
5、 resistance, durability strong, material plasticity, facilitate architectural art processing, also easy to meet the requirements of the bridge curve and slope. When the bridge spans increases, the under load of continuous girder bridge for middle section of the node
6、 will bear larger in the negative moment, from absolute value perspective, the fulcrum in the negative moment far outweigh the cross CKS bending moment. The variable beam can be applied to the internal structure more distribution rule. Often the cantilever construct
7、ion method, become beam's stress state and its construction of internal force of the state results, more suitable to the large span prestressed concrete continuous girder bridge, its appearance is harmonious, save material and can increase the obstacle clearance und
8、er the bridge, is the large span bridge optimization. Thisdesignincludetheupperstructureloadliveloadinternalforceofmaingirderintralforceca
