混凝土構(gòu)件內(nèi)現(xiàn)存應(yīng)力鉆孔釋放過(guò)程的有限元模擬.pdf

1、東北大學(xué)碩士學(xué)位論文混凝土構(gòu)件內(nèi)現(xiàn)存應(yīng)力鉆孔釋放過(guò)程的有限元模擬姓名：劉芳申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：固體力學(xué)指導(dǎo)教師：張鳳鵬20090601FiniteelementSimulationoftheReleasingProcessofExistingStressinConcreteStructuresbyDrillingHoleMethodAbstractTheexistingstressinconcretestructuresisoneo

2、fthemostimportantparameterstepresenttheforceconditionandthereliabilityofthestructureTherefore，theexactpredictionoftheexistingprestressingforcebecomescrucialTheholedrillingmethodisaneffectivemethodofmeasuringthestressinsi

3、deconcreteAndthemethodhastheoreticalsignificanceandapplicationvalueforresearchingthereleasingprocessandthereleasingruleInthisthesis，thereleasingprocessofexistingstressinprestressedconcretestructurebytheholedrillingmethod

4、issimulatedbyfiniteelementmethodwiththeboreholediameterof120mm，theinnerdiameterofll0mm，themaximumdepthof1lOmmStrainreleasingrateisusedtodescribetheprincipleofreleasingTechniqueofelementbirthanddeathisusedtosimulatedrilli

5、ngprocessThestressreleasingrateunderuniformload，gradientforce，shearstressandpressureshearstressstateisstudiedThestrainreleasingrateundereverystressstateiscomparedandanalyzedtheinfluenceoftheprincipleofreleasingunderdiffe

6、rentstressstateAswellastheanalysisunderthedifferentload(pressureandpureshear)andthecomponentthickness，thestrainchangesandthedisciplineofstrainreleasewiththedepthofdrillingchangesTheresultsindicatethatthestrainreleasingva

7、luedependsonthestressinitialvalueandthestressconditionThestrainreleasingrateisrelatedtothedepthofhole，butnotthestressstateandloadconditionThedepthoftheholethatstresshasbeencompletelyreleaseddoesnotchangewiththestresscond

8、itionandtheinitialstressStrainreleaseandthereleaseratevaluesalsodependonthesizeofcomponentthicknessdirection；whenlargerthan150mmscantlings，thecomponentsizeisnolongerafactorintheimpactofstrainreleaseKeywords：prestressedco