活性粉末混凝土低高度梁优化分析

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1、北京交通大学硕士学位论文活性粉末混凝土低高度梁优化分析姓名：张景辉申请学位级别：硕士专业：桥梁与隧道工程指导教师：阎贵平20080601ABSTRACTReactivePowderConcrete(RPC)isanewgenerationcomplexmaterial，whichoossessesexcellentpropertiessuchasultra-hi曲strength，hightoughnessandhighdurabilityetc．Currently,thestudyofRPCismainlyconcentratedi

2、nmaterialproponioningoptimizationandprimarymechanicsperformance，whileseldomresearchworkisconductedonRPCbridgedesigntheoryandmethod．TheapplicationofRPCinbridgeengineeringwilldecreasethedirectmaintenance，tmprovethegeneraIper坟，姗anceandreducethebridgetotalcostandSOon．Thispa

3、percarriesouttheoptimizationdesignresearchonRPCsimply—supportedbox—girderbridgesinlow-heighttoprovidethereferenceforthepracticalapplicationofRPC．T【lispapercombinesfiniteelementanalysisandoptimizationmethodtomcoreticallyanalyzeRPCsimply-supportedlow—heightbox—girderbridg

4、es．Theoptimalparametersofcross．sectionandoptimalprestressedRPCcrOSS。sectionalareasCallbedeterminedbyoptimizationanalysis．ThegirdertotalconstructioncostIStakenasobjectivefunction，whilethesectionaldimensionsofthebox。girderandprestressed厕nf．orcelnentareaasdesignvariables，u

5、nderconstraintsofthestrengthanddeflection，finiteelementparameteroptimalanalyticalmethodsinglemmethod15appliedtooptimallyanalyzethemainworkingconditionsofthebox‘girder’snormalperformance·Theresultsindicatetllattllesectionalheightisthekeydecidingfactorwhenthetotalconstruc

6、tioncostofprestressedRPCsimplysupportedbox—girderisoptimal，andprestressedreinforcementareaisthekeydecidingfactorofgirderdeflectionwhenthesectionalheightiscertain．Thispapercarriesoutoptimalcalculationandanalysison20m—span，24m-span，32m—spall，40m—spandouble-linesingle-hole

7、simplysupportedbox—girdersintheratio础geofheightandspan(H／S)from1／12，1／13，1／14，1／15to1／16，andatlastoptimalsectionalparameterandoptimalprestressedreinforcementareaofallspansalegained·Du—ngtheaIlalyticalcalculation，sincetheendcross-sectionoftheRPCbox-girderwimconstantsecti

8、onhaswellmetthestructuralstrengthrequirement，thecommonreinforcedbarandthesectiononlyhavetosatisfythestructural