拱桥毕业设计正文.doc

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1、摘要本桥位于沪蓉国道主干线湖北省宜昌至恩施段K29+245处，跨越佑溪，沟宽约110m。河道与路线正交，河床稳定，河道顺直，平时沟内水量较少，沟底较深，比降较大，泄洪顺畅。设计主要分为桥型方案比较和推荐方案设计，桥型方案中拟定了三个比选方案，方案一为混凝土简支梁桥，方案二为预应力混凝土箱形连续梁桥。方案三为上承式混凝土箱形拱桥。通过方案比选，最终选用方案三：上承式混凝土箱形拱桥，跨径组成为净跨径64m拱跨和两边各一跨8m简支板引桥跨。桥梁全长89.28m，桥面净空为外侧0.5m钢筋混凝土防撞护栏＋桥面宽净11.0m＋0.75m波形钢板防撞护栏，桥面横坡2%。本桥上部为

2、空腹式，下部为重力式实体桥台，引桥采用轻型桥台和柱式桥墩。结构计算主要针对上部结构盖梁、立柱、拱箱，下部结构桥台进行了细部尺寸拟定、内力计算、配筋计算、截面验算。桥梁下部结构为重力式墩，基础采用刚性扩大基础。本设计仅对1号桥墩进行了强度及稳定性验算。关键词：拱轴系数；箱形拱肋；主拱圈内力组合；截面强度；刚性扩大基础。AbstractAccordingtothegraduationprojecttaskpaperofthebridgeengineeringgraduates,thisbridgeislocatedinsectionK249+245oftheHuRongn

3、ationalhighwayinHubeifromyichangtoenshi,whichcrossingthecreekyouxi.Theriverwayisorthogonalwiththeroadandisverydeepwithlittleriverwateratordinarytimes.Bottomoftrenchismoredepthwithmuchgradient,andflooddischargesmoothly.Thedesignmailyfocusonthecomparisonbetweentheprojectstyleofthebridgean

4、dthedesignoftherecommendedstyle.Therearethreealternativesonthebridgestyle,thefistoneisaconcretesimplebeambridge,thesecondisaprestressedconcretecontinuousgirderbridgebox,andthethirdoneisaopenspandreltop-beararchbridge.Throughcomparingthethreeprojects,andthethirdoneisthebest.Thebridgehasa

5、netspanacross64marchandan8msimplysupportedslabbyeveryside.Thebridgeis89.28matlength,witha0.5mreinforcedconcreteimpact-proofguardrailingbytheoutboard,anetwidth11manda0.75mwaveformimpact-proofguardrailanda2%decktransverseslope.Theupperofthebridgeisemptyarchandthebelowisgravitytypeabutment

6、entities.Theapproachbridgehasalighttheabutmentandpillartypepier.Thestructuralcalculationaremainlyaimedatthedetailsizes,internalforces,reinforcementandcrosssectionareaontheuppercappingbeamstructure,uprightcolumn,archboxandthebelowstructureofthebridgeabutment.Thisbridgeadoptsthegravitytyp

7、epierandrigidexpandingstructureinlowerfoundation.Inthisarticle,takethestrengthandstabilityofthenumber1bridge-'pierasanexample..Keywords:archaxiscoefficient;archrib;internalforce;internalforcecombination;rigidityofsection;rigidexpandingfoundation目录摘要IAbstractII第一章结构设计方案11.1设计资料1