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1、重慶大學碩士學位論文框支短肢剪力墻梁式轉換結構的抗震性能試驗研究姓名:倪忠申請學位級別:碩士專業(yè):結構工程指導教師:鐘樹生20060501中文摘要摘要本試驗課題試驗主要研究鋼筋混凝土框支短肢剪力墻梁式轉換結構的抗震性能。通過二榀鋼筋混凝土框支短肢剪力墻加腋梁式轉換結構及一榀不加腋梁式轉換結構的低周反復試驗,獲得了該類轉換結構的基本性能,其中包括開裂前后的應力狀況,裂縫的發(fā)生、發(fā)展以及最后的破壞形態(tài),荷載在短肢墻、轉換梁、框支柱中的傳遞方式等。試驗重點研究了框支短肢剪力墻結構的延性、耗能性、剛度衰減特征,結構的屈服機制
2、和破壞機制。試驗結果表明經(jīng)過合理設計的框支短肢剪力墻結構具有良好的抗震性能。此類結構滯回曲線的滯回環(huán)飽滿,骨架曲線下降段比較平緩;延性完全滿足抗震規(guī)范對結構延性系數(shù)大于4的要求;各層剛度分布比較均勻,其彈性及彈塑性變形過程中各層變形性能較為穩(wěn)定,有效地克服了底層薄弱的現(xiàn)象;屈服機制為抗震耗能好的“強柱、弱梁、更強節(jié)點”的延性屈服機制。在試驗的基礎上,通過加腋轉換梁與不加腋轉換梁的試驗結果進行對比,結果表明:加腋能很好地起到保護節(jié)點作用,從而使框支短肢剪力墻結構先出現(xiàn)梁鉸后出現(xiàn)柱鉸;在建筑空間允許的情況下,設計人員要優(yōu)
3、先考慮采用加腋轉換梁。關鍵詞:框支短肢剪力墻結構,低周反復試驗,轉換層,加腋I重慶大學碩士學位論文ABSTRACTTheseismicbehaviorsofreinforcedconcretestructureframe-supportedshort-legshearwallstructureareinvestigatedinthethesisofthetest.Accordingtoexperimentalachievementsoftworeinforcedconcretestructurespecimensof
4、reinforcedconcretestructurewithtransferstorywhichhavethehaunchedtransferbeamsandonespecimenofreinforcedconcretestructurewithtransferstorywhichhavenohaunchedtransferbeamsundercyclicloading,basicbehaviorsofthestructureareachieved,includingstressstatesbeforeandaft
5、ercracking,occurrenceanddevelopmentofcracksandthefailuremode.Theductility,energydissipationfeatures,deteriorationprocessofstiffness,yieldingmechanismandfailurephenomenonarespeciallystudiedinthetest.Inaddition,load-transferringpathsintheshort-legshearwall,transf
6、erbeamandframe-legcolumnareinvestigated.Thetestresultsprovedthattheseismicbehaviorofframe-supportedshort-legshearwallstructurebyreasonabledesignisaccepted.Theloadanddisplacementloopisplump,andthedescentpartofframeworkcurveissmoothinthestructure.Ithasenoughducti
7、litytoreachtherequirementspecifiedin“Codeforseismicdesignofbuildings”.Thestiffnessdistributionofframe-supportedshort-legshearwallisevenbetter,andtheproblemofsoftstorycanbeavoided,andtheyieldingmechanismisductile.Onthebasisofexistingexperimentalresults,acomparis
8、onismadebetweentheresultsofthehaunchedtransferbeamsandtheordinarytransferbeam,andagoodagreementisobtained.Theagreementisthatthearmpitsonthetransferbeamcouldkeepthejointsofth