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1、西南交通大學(xué)碩士研究生學(xué)位論文第1I頁(yè)AbstractDongxinGanjiangRiverBridgeisathroughtypecontinuoussteeltrussbridge．Itsspanarrangementis126+196+126m，whichisthefirstlong-spandoublesteeltrUSSbridgewithfour-lineinChina．Thetopchordofthemaintrussisassemblyjointed,whichischaracterizedbygreatinternalforceand
2、complicatedstructuredetails．BasedonthebackgroundofDongxinGanjiangRiverBridge，systematicalinvestigationbasedonthemodeltesthasbeendonetostudythemechanicalbehaviorofA9joint．Themainresearchcontentsareasfollows：I、Inordertogetthemostpossibleunfavorableprocessingconditionsofthejointsund
3、erthecombinationofdeadloadandliveload，afiniteelementmodelisestablishedbythespatialplateshellmethodaccordingtothecharacteristicsoffour-linedouble—trussplate—trusscompositebridges‘2、Thescalemodelin1：4ratioWasdesignedand．manufacturedinordertosimulatethestressstatesofA9jointintheposi
4、tionofthemiddlesupportofactualBridge．3、UsingtheFEMsoftwareANSYS，shellclementisappliedtosimulatejointstructuredetailsandlocalFEManalysishasbeendone．Thejointstressstateaswellastheperformanceunderthedesignloadandultimateloadhavebeenobtained．4、ScalemodeltestWascarriedouttoinvestigate
5、thejointstressstateandperformanceunderthedesignloadandultimateload．5、Theresultsofthemodeltestandthetheoreticalcalculationwerecomparedandthevalidityoftheoreticalcalculationwasinvestigated．Theresultsshowedthatthestresslevelofthemodeltestishigherthanthetheoreticalanalysiswhichsimula
6、tesfrictionalhigh-strengthboltsbyincreasingthethicknessofjointplates．6、Mechanicalperformanceofthejointundertheultimateloadisevaluatedthroughthemodeltest．Furthermore，itisconcludedthatthedesignofassemblyjointisdeterminedbythestressofjointplatesectionandrodmiddlesectionkeywords：Dong
7、xinGanjiangRiverBridge；doubletrUSS、歷mfour-line；platetrusscompositesystem；assemblyjoint西南交通大學(xué)碩士研究生學(xué)位論文第1II頁(yè)目錄第1章緒論????????????????????????????．．11．1引言??????????????????????????????????????????11．2本文工程背景????????????????????????????21．3本文的主要研究?jī)?nèi)容?????????????????????????3第2章東新贛江橋全橋受力
8、性能分析??????????????????。42．1工程概況?????????
