最新修订版预应力空心板桥桥梁毕业论文设计.doc

(此文档为word格式，下载后您可任意编辑修改！) 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）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，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 ABSTRACT The design for prestressed concrete continuous girder bridge types , prestressed concrete ?continuous?beam?is?now?widely?used?a?system,?mainly?is?suitable?for?the?large?span?bridge.?It?,?structure?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??the?bridge?spans?increases,?the?under?load?of?continuous?girder?bridge?for?middle?section?of?the?node?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?construction?method,?become?beams?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??increase?the?obstacle?clearance?under?the?bridge,?is?the?large?span?bridge?optimization.? This design include the upper structure load live load internal force of main girder intral force calculation calculate and determine the reinforcement area of prestress calculation ?topic?for:?three?cross Pres tressed?concrete?continuous?bridge?variable?cross-section?of?the?box.?It?,?structure?stiffness