等截面悬链线圬工拱桥设计-毕业设计.doc

武汉理工大学毕业设计（论文）武汉理工大学学士学位论文摘要本桥是双跨，净跨径60m的等截面悬链线无铰拱拱桥。按照设计资料的各种数据采用空腹式拱上结构，在主拱上两侧布置3孔净跨径为3.6m的腹拱。各孔矢跨比基本一致，拱圈采用板拱截面，拱座采用两铰拱形式，拱上建筑为空腹式，下部结构为重力式桥墩和U形桥台,均置于非岩石土上。通过对此悬链线板形拱桥的设计，我对桥梁营运阶段的设计有了总体的了解，掌握了拱桥中主拱圈截面几何要素的计算、拱轴系数的确定、主拱圈正截的强度验算、主拱圈稳定性验算、裸拱圈强度和稳定性验算以及荷载计算等。本设计主要对该桥的主拱进行设计。先根据地质条件对正桥的跨径和矢高进行拟订，计算主拱圈的弹性中心和弹性系数，验算恒载和活载对拱顶、1/4截面和桥墩产生的内力，重点考虑了用“假载法”计入“五点”存在的偏离的影响拱，再计算温度和混凝土收缩产生的内力。然后对主拱圈的强度和稳定性进行验算。最后进行桥墩和桥台的尺寸拟定，及其荷载计算，强度计算和稳定性验算。【关键词】拱桥等截面悬链线无铰拱拱轴系数腹拱AbstractItis，two-span,auniformcrosssectioncatenaryfixedarchbridge。Itis60mofclearspan。Accordingtothedifferentkindsofdesigndataadoptopenspandrelupperstructure，bothsidesdisposaledthreeholeclearspandiameterfor3.6montheabdomenofmainarchupper.Thesametoeachholeratioofrisetospansubstantial，archringadoptUribmultichambercasecompoundsection，andskewbackadoptdouble-hingedarchform，archupperconstructionbeblankabdominaltype.Throughdesigningthemediumofwithalcatenaryboxribbedarchbridge，Ihadapopulationknownwithbridgetransportoperationphasicdesigned，knowingclearlyarchbridgesuffermainarchcirclesectiongeometricelement'figure,archaxismodularascertain,mainarchcircleabscissusintensityproven,mainarchcirclestabilityproven,nakednessarchringintensityandstabilityprovengradeup.Thesedesignmostlydesignedthemainarch.Priorityonthebasisofelasticcenterandcoefficientofelasticity，provendeadloadandaliveloadgemelarchapex,skewback1/4sectionandbridgepierbringinternalforce，emphasestakewith"dummypropellerbossfarad"number"cinephile"availableoffnormalimpactarch，recalculationtemperatureandconcreteshrinkageprocreativeinternalforceintoconsiderationforthfromnatureconditionalignmentpontinebayandbilgeproceeddrawnout，countmainarchcircle.Second,Iproventhemainarchcircle'sintensityandstabilityproceed.Atlast,thecountofdimension,load,strength,stabilityforbridgepierandabutment.【Keyword】archbridgeuniformcrosssectioncatenaryfixedarcharchaxiscoefficientabdomenarch1绪论拱桥外形美观，且其形状反应出桥的受力状况。拱桥不是简单地架在基础之上，而是不断地把基础向外推。就好像把一个拱形梁两脚着地放着，然后在拱顶加载，这个梁就会向两端伸展变平。为了防止两边拱脚外移，要在两边设置重