大跨径变截面预应力混凝土连续刚构桥施工控制分析

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1、I．．．．．．．一——ABSTRACTItiSeasierforlarge．spancurvedcontinuousrigid-framebridgetoovercometllerestrictiotlsonterrainandsurfacefeaturesthatbyshorteningthelengthoftheroadoravoidingunfavorablegeologicareassuchaskarstcave，landslipanddebrisflowaspossible，peoplecouldreduceengineeringcostefficient

2、ly．Curvedbridgeshavegotmoreandmorewidelyusedintrafficengineeringprojectsatpresent。Inthispaper'basedonChangxibridge，weconsiderthemainfactorsofcurvedbeamforcesuch硒sectorialmomentofinertia,centralangle‘PoaswellasridgewidthandcurvatureradiusratioandSOon．Toapplythemodemcontroltheorytotheana

3、lysisofitbyadvancinganalysisbackwardanalysisandgreytheoryforecast．Meanwhile，itssimulationanalysiswasdonebydimofMidas／Civilsoftware．Herewegotsomeconclusionsaftermonitoringthedeformation,stressandtemperatureoftheworkingconditioninthecantilevercastingconstruction．①hlt11eprocessofthecantil

4、everpouring，therotationaldisplacementsofz_axisandpaxisinthecylindricalcoordinateandthelineardisplacementoftheaxisofbeamwillbecompensatedinpartorevenfullwithpouringthenextsegmentalgirderconcrete·Inaddition，thebridge’ShorizontalalignmentCanbeguaranteedbysettingasidethelineardisplacemento

5、f)，onradialAxis户，andtheverticalalignmentcanbeobtainedthroughreservingthelineardisplacementof6inverticalface．SoputtingthepointofthelinearcontrolonJ、扑力iSnotonlyfeasiblebutalsoCanmeettheengineeringrequirements．②Ont11eprincipleoflinearcontrolfirstandstresscontrolsecondintheconstructionproc

6、ess．Wecomparetherealdeformationwiththeoryvalueinthecantilevercastingperiodofsidespanclosing，middlespanclosingandbridgedeckpavementandtheydovetailverywell．③Thecross．sectionofboxgirderunderloadwillemergeLongitudinalnormal咖ssandshearstressunderthecombinationofmomentandtorsion；andbendingst

7、ressandshearstressalsoemergeatthecombinationofmomentandtorsionintI．ansverse．Theresultofthestresstestwemonitoredon-sitefitthecalculatedvalueverywell．KEYWORDS：continuousrigidframebridge；constructioncontrol；stressmonitoringdeflectionmonitoring；cantilevercasting目录第一章概论⋯⋯⋯．．．⋯．⋯⋯⋯⋯⋯⋯⋯．．⋯．