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1、摘要在本設(shè)計(jì)中，根據(jù)地形圖和任務(wù)書(shū)要求，依據(jù)現(xiàn)行公路橋梁設(shè)計(jì)規(guī)范提出了預(yù)應(yīng)力混凝土連續(xù)梁橋、預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)兩種橋型方案。按照“實(shí)用、經(jīng)濟(jì)、安全、美觀”的橋梁設(shè)計(jì)原則，經(jīng)過(guò)多方面的比選最終選擇46m+76m+46m的預(yù)應(yīng)力混凝土連續(xù)梁橋?yàn)楸敬蔚耐扑]設(shè)計(jì)橋型。本設(shè)計(jì)利用Midas軟件進(jìn)行結(jié)構(gòu)分析，根據(jù)橋梁的尺寸擬定建立橋梁基本模型，然后進(jìn)行內(nèi)力分析，計(jì)算配筋結(jié)果，進(jìn)行施工各階段分析及截面驗(yàn)算。同時(shí)，必須要考慮混凝土收縮、徐變次內(nèi)力和溫度次內(nèi)力等因素的影響。本設(shè)計(jì)主要是預(yù)應(yīng)力混凝土連續(xù)梁橋的上部結(jié)構(gòu)設(shè)計(jì)，設(shè)計(jì)中主要進(jìn)行了橋梁總體布置及結(jié)
2、構(gòu)尺寸擬定、橋梁荷載內(nèi)力計(jì)算、橋梁預(yù)應(yīng)力鋼束的估算與布置、橋梁預(yù)應(yīng)力損失及應(yīng)力的驗(yàn)算、次內(nèi)力的驗(yàn)算、內(nèi)力組合驗(yàn)算、主梁截面應(yīng)力驗(yàn)算、橋梁施工組織設(shè)計(jì)等主要內(nèi)容。最后，經(jīng)過(guò)分析驗(yàn)算表明該設(shè)計(jì)計(jì)算方法正確，內(nèi)力分布合理，符合設(shè)計(jì)任務(wù)的要求。關(guān)鍵字：比選方案；連續(xù)梁橋；Midas；結(jié)構(gòu)分析；驗(yàn)算共78頁(yè)第47頁(yè)ABSTRACTInthisdesign,accordingtothetopographyandprojectrequirementsandonthebasisofthecurrenthighwaybridgedesignspecifi
3、cations,theauthorputforwardtwoschemes,prestressedconcretecontinuousgirderbridgesandcontinuousrigid-framestructureofprestressedconcrete.Inadherencetobridgedesignprinciples,“practical,economical,safeandgood-looking”,prestressedconcretecontinuousgirderbridgesof46m+76m+46mwe
4、refinallychosenastherecommendeddesigningmodelaftervariouscomparisonandselection.ThedesignmadefulluseofMidastoconductthestructuralanalysis.Itbuiltupthebasicmodelofthebridgetakiconsiderationoftheexpectedsize,andthentooktheanalysisofinternalforceandcalculatedreinforcementre
5、sults,accomplishingactualconstructionanalysisofeveryphaseaswellascrosssectionchecking.Meanwhile,duringtheprocess,elementsincludingcreepandshrinkageofconcrete,creepsecondaryinternalforceandtemperaturesecondaryinternalforceshouldalsobetakenintoaccount.Thedesignmainlyfocuse
6、dontheupperstructuredesignofprestressedconcretecontinuousgirderbridges.Majortaskscompletedinthedesignweretheoverallbridgelayout,setofthestructuresize,calculationofbridgeloadinternalforce,estimationandarrangementofbridgeprestressedsteelbeam,checkoflossandstressofbridgepre
7、stress,secondaryinternalforce,internalforcecombinationandcrosssectionstressofmainbeam,anddesignofthebridgeconstruction.Finally,theanalysisshowedthatthedesigncalculationmethodwasrightandscientificwithrationalinternalforcedistribution.Thusitfullycompliedwithprojectrequirem
8、ents.KEYWORDS:selectionscheme,continuousgirderbridge,Midas,structuralanalysis,checkingcomputations共78頁(yè)第
