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1、Experimentalstudyonprestressedconcreteflatbeam-columnjoints(SupportedbyNationalNaturalScienceFoundationofChina(No.50968013))ADissertationSubmittedfortheDegreeofMasterOnGeotechnicalEngineeringbyFang-binWangUndertheSupervisionofProf.HongpingandQin-wenLiu(Colleg
2、eofArchitecture)NanchangHangkongUniversity,Nanchang,ChinaJune,2012南昌航空大學(xué)碩士學(xué)位論文摘要摘摘摘摘要要要要扁梁節(jié)點截面尺寸特殊,其寬度不僅大于高度,而且超出柱截面寬度;另外,受預(yù)應(yīng)力作用的扁梁相當(dāng)于樓板的支撐構(gòu)件,樓板對其也產(chǎn)生約束作用。因此,扁梁節(jié)點受力性能較一般梁柱節(jié)點更為復(fù)雜,需對其進行專門研究。本文以國家自然科學(xué)基金項目“預(yù)應(yīng)力混凝土寬扁梁框架節(jié)點抗震性能及設(shè)計方法”(項目編號:50968013)為依托,考慮預(yù)應(yīng)力筋位置的變化對節(jié)點受力
3、性能的影響,對低周反復(fù)荷載作用下的3個預(yù)應(yīng)力混凝土扁梁框架邊節(jié)點和1個普通鋼筋混凝土扁梁框架邊節(jié)點進行試驗研究,通過對試驗數(shù)據(jù)的處理,分析試件的滯回曲線、骨架曲線、耗能能力等抗震性能指標,并借助ANSYS軟件對試驗過程進行有限元分析,模擬結(jié)果與試驗結(jié)果基本吻合。主要結(jié)論及建議如下:(1)施加預(yù)應(yīng)力與否以及施加預(yù)應(yīng)力位置的變化對試件耗能能力影響不大;(2)試驗過程中,斜壓桿機理和桁架機理共同參與工作;(3)預(yù)應(yīng)力筋穿柱與否對試件抗震性能的影響不大,在實際工程應(yīng)用中可以考慮預(yù)應(yīng)力筋不穿過柱節(jié)點的施工方法。關(guān)鍵詞:預(yù)應(yīng)
4、力混凝土,扁梁框架節(jié)點,試驗研究,抗震性能,ANSYS模擬I南昌航空大學(xué)碩士學(xué)位論文AbstractAbstractNotonlythebreadthofsectionisgreaterthanthedepthofsectioninflatbeamjoints,butalsogreaterthanthecolumnwidth,sothesectionofthiskindjointiscomplex;Moreover,theprestressedbeamcanbeusedassupportedmemberforth
5、efloor,therefore,theflatbeamjointswhichhasmorecomplexstressingperformancethanbeam-columnjointsneedsspecialstudy.ThispaperwiththeNationalNaturalScienceFoundationofChina“Studytheseismicperformanceanddesigningproceduresonprestressedconcreteflatbeam-columnjoints”
6、(No.50968013)asthebase.Consideringtheeffectionofchangingprestressingtendonpositiononstressingperformance,andthenstudyingthreeprestressedconcreteflatbeam-columnjointsandaRCflatbeam-columnjointwhichunderlowfrequencereversedloads.Afterthat,researchingtheindexeso
7、fseismicperformancebystudyingexperimentaldate,suchasthehysteresisloops,theskeletoncurve,ductilityandenergydissipationcapacity.ThenusingtheANSYSsoftwaretosimulatetheexperimentalprocess,itcoincidswiththeexperimentalresultswell.Themainconclusionssuggestareasfoll
8、ows:(1)Exertingprestressandchangingprestressingtendonpositionhavelittleeffectiononenergedissipationcapacity.(2)Obliquecompressionlevermechanismandthetrussmechanismareworkingtogetherthroug