火災(zāi)下預(yù)應(yīng)力構(gòu)件混凝土爆裂規(guī)律試驗(yàn)研究.pdf

1、哈爾濱工業(yè)大學(xué)碩士學(xué)位論文火災(zāi)下預(yù)應(yīng)力構(gòu)件混凝土爆裂規(guī)律試驗(yàn)研究姓名：石東升申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：鄭文忠20050601譬塵簍三蘭盔：三耋堡圭：蘭篁三AbstractConcretespallingisdangeroustoprestressedconcretememberssubjectedtofireItmakesreinforcingsteelbarbebaredinfire，anditsmechanicpro

2、pertybelostquicklyconsequently，itwillresultinfailureofmembersatpresent，itisnotcleartegulationandeffectfactorsofconcretespallinganditisnotknownthateffectivemeasurespreventingconcretespallingshouldbetakenSo，itisnecessaryto

3、carryoutexperimentalresearchonconcretespallingAccordingtoIS0834standardheatingcnrve，heatingfireexperimentsoffifteenprestressedconcretesimplesupportedslabs，nineprestressedconcretetwospancontinuousbeams，threeprestressedcon

4、cretesimplesupportedbeams，nineprestressedconcretetwospancontinuousbeamsareaccomplishedConcretespallingregulationandeffectfactorsofprestressedmemberssubjectedtofirearestudied，therelationshipofprecompressionregionstresslev

5、elandconcretespallingisdiscussedemphaticallythepaperillustratesprimarytheregulationthatprecompressionregionconcretestressaffectsonconcretespallingofprestressedconcretememberssubjectedtofireThefollowingconclusionsaredrawn

6、：1ExperimentsshowthatconcretespallingiseasierandmoreseriousonconditionthatstresslevelofprecompressionregionorwaterpercentageinconcreteishJigherinprestressedconcretememberssubjectedtofire；2Therelationshipcurvesofthemeanof

7、cubiecompressivestrengthofconcrete，waterpercentageinconcrete，stresslevelofpreeompressionregionwithconcretespallingareestablished；3Checkingcomputationsmethodsofconcretespallinginprestressedmemberssubjectedtofireareputforw