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1、毕业设计***河连续刚构桥摘要根据设计任务书要求,依据现行公路桥梁设计规,综合考虑桥位的地质、地形条件,提出了独塔斜拉桥、上承式钢管混凝土拱桥和预应力混凝土连续钢构三个比选方案。按“安全、经济、适用、美观和有利于环保”的桥梁设计原则,分析了三个方案的优缺点。推荐预应力混凝土连续刚构作为设计方案。推荐方案以基本设计理论为基础,参考国外成功的大跨连续钢构桥,拟定了的跨径,主梁采用1.8次抛物线变梁高的单箱单室箱主梁,桥墩为双薄壁空心墩,桥台为轻型桥台,基础为群桩基础,施工阶段采取挂篮悬臂现浇法。对推荐方案进行了结构细部尺寸拟定,对上部结构和下部结构进行了力计算、配筋设计及控
2、制截面强度、应力验算,变形验算等。经分析比较及验算结果表明该桥梁设计合理,符合设计任务的要求。关键词:预应力混凝土连续刚构,钢管混凝土拱桥,斜拉桥,悬臂现浇,应力验算ABSTRACTAccordingtothedesignrequirements,theexistingdesignspecificationofhighwaybridge,consideringthegeologyandterrainconditionsofthebridgesite,afterpreliminaryselection,threebridgetypeschemasarepresented,
3、theyarecable-stayedbridge,archbridgeandprestressedconcretecontinuousrigidframebridge.Thencomparingtheadvantagesanddisadvantagesofthreeoptionscomprehensivelybythephilosophyofbridgedesignas“Security,Economy,Application,BeautyandEnvironmentalProtection”.ThePCcontinuousrigidframebridgeissele
4、ctedastherecommendedschemeaftertheselections.Thisprojectisbasedonthebasictheoryofbridgedesignandtakethedomesticandinternationalsuccessfuldesignsforexample,finallychoseaspancombinationof.ThedepthofSinglecellboxgirdervariesasthesecond-degreeparabola,thepierisadoublethin-wallhollowpier,thea
5、butmentislightabutment,thefoundationisgroupedpilesfoundation,andthethehangingbasketcantilevercastingconstructionmethod.Throughdrawingupofstructure’sdimensionandthendesigntheupperandlowerpartofthestructure,suchascalculatedtheinternalforceofdeadandlivingload,prestressedsteeldesign,checking
6、thestrengthandstressofcontrolcross-section.Finally,checkforliveloaddeformation.Checkedbythecomparisonandanalysisshowthatthedesignmethodofcalculationiscorrect,andthedistributionofreinforcementisReasonable,sothisdesignmeetthedesignrequirements.Keyword:prestressedconcretecontinuousrigidfram
7、ebridge,doublethin-wallhollowpier,cantilevercastingconstruction目录第一章概述································11.1地质条件······························11.2主要技术指标····························11.3设计规及标准···························1第二章方案比选·······························22.1概述············