基于应力释放法的预应力空心板桥现存应力检测的模型试验研究

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1、重庆交通大学硕士学位论文基于应力释放法的预应力空心板桥现存应力检测的模型试验研究姓名：王标才申请学位级别：硕士专业：结构工程指导教师：黄福伟20090301ABSTRACTtheexistingstressofthePrestressedconcretebridgesisoneofthekeymetricreflectedthestateofthetechnology．Becauseofprestressloss，concreteshrinkageandcreep，structuraldamage，etc，Itmaybeverydifferentbetweenexpecte

2、dandactualvalues．Itmayaffecttheservicefunctionofbridges，mayevenleadtosecurityincidents·Theexistingstressinspectionofbridgesisstilladifficulttechnicalproblematpresent·Inthispaper，basedonlotsofdocumentsathomeandabroad，Usingstress’releasingmethodtoanalystheexistingprestressofthehollowslabbrid

3、ges．itnotonlyanalyzedbvthefiniteelementcalcution，buttestedbythemodelofinterior．Themainresearchworkingasfollows：1．Foraprestressedconcretehollowslabbridges，whichspanis20metres，modelingathree。dimensionalsolidfiniteelementmodel，whichsimulatedconcretestress。releasemethod．thearctilemailyanalysis

4、eddifferentsizesofring-holes，square—holesandhorizontalgrooves，andminimumcuttingdepththatthesurfacestressreleasetozero·2．Foralengthof10mprestressedhollowslabbridge，basedonthestressreleasingnlethodofsteelbars，modelingthethree．dimensionalsolidfiniteelementfornumericalcalculation．studingthestr

5、essofsteel．barschangewhileoneofthesetendonswastotallossedtheprestress，exploringandprovingthefeasibilityofthismethodintheory·3．Fortwopiecesofrectangularreinforcedconcreteslab，whichsizeis1．5mx2．0m×0．2m．noanyprestress，todoconcrete．cutting，steel—cuttingtest．WeStudiedlot’sofef-fectf-actorsabout

6、concreteandsteel．barstress—realeasingmethods，gotmanypracticalconclusion，that’Sthebasisofthetestaboutthestructureoftheexistingstress·4．Foralengthof10rnprestressedconcretehollowslabmodel，respectivelythetestofthestress．realeasingofconcreteandsteelbars．studingforthoseaspectsofstress．realeasing

7、ofconcreteandsteelbars，atlastconcludedthat“stress。realeasingofsteelbarsisbetter,anditsaccuracycanreach90％above”．KEYWORDS：prestressconcretehollowslab；existingprestressed；stressrelease；modeltest重庆交通大学学位论文原创性声明本人郑重声明：所呈交的学位论文，是本人在导师的指导下，独立进行研究工作所取得的成果。除文中已经注明引用的内