冲击载荷下玄武岩纤维增强混凝土的动态本构关(6)

介绍了混凝土动态本构关系

Structuralvibrationcontrolconsideringpile soil structuredynamicinteraction

ZOULi hua,FANGLei qing

1

2

(1.CivilEngineeringInstitute,FuzhouUniversity,Fuzhou350108,China;2.CivilEngineeringInstitute,LanzhouJiaotongUniversity,Lanzhou730070,China)

Abstract: BasedonthePenzienmode,lacalculationmodelofastructureinconsiderationofpile soil structure

interaction(PSSI)wasestablishedandthevibrationcontrolequationsofthestructuralmotionwerederived.PSSI seffectsonstructuralvibrationcontrolwereanalyzed.Theeffectsofeveryparameterofsoilandstructuresonstructuralvibrationcontrolwerestudied.TheresultsshowedthatconsideringPSSI,thestructuralearthquakeresponseisincreased,thecontrol effectisreduced,thecontrolforceisincreased;theequivalentshearwavevelocityofsoi,ltherotaryinertiaofpileandthenaturalperiodofupperstructurehavesignificanteffectsonstructuralvibrationcontroltosomeexten.t

Keywords:pile soil structureinteraction(PSSI);vibrationcontro;lPenizenmodel

(pp:100-104)

Avibratormodelforapiezoelectricmotorwithrotaryinertia

XINGJi chun,XULi zhong,LIANGYong li

(YanshanUniversity,Qinhuangdao066004,China)

Abstract: Onekindofnewpiezoelectricmotorswithrotaryinertiawasproposed.Itutilizedthepiezoelectricbimorphsasthedrivecomponentsandtheelectricalsignalwiththesaw toothwavetoproducetheinertiaimpulse,itmadetheelectricalmachineryrevolve.Thedrivingprincipleofthemotorwasanalyzed,thedynamicmodelofthepiezoelectricvibratorwassetupanditsfreevibrationnaturalfrequenciesandmodalfunctionsweresolvedou.tTheaffectingfactorsandtheireffectsonitsnaturalfrequencywerealsoinvestigated.Theresultsshowedthatthevalueofthemodalfunctionofthebeamendandthequalityfactor areinverselyproportionaltoeachother.Theseresultsprovided basisfordesignandfurtherstudyonpiezoelectricmotors.

Keywords:piezoelectricvibrator;inertialimpac;tsaw toothwave;modalfunction

(pp:105-109)

Dynamicconstitutiverelationofbasaltfiberreinforcedconcreteunderimpactloading

FANFei lin,YEXue hua,XUJin yu,LIWei min,CHENYong

3.NorthwestPolytechnicUniversity,Xi an710072,China;

4.Center SouthAirportConstructionCompany,HunanHengyang421000,China;

5.TheNinthEngineeringBrigadeofChineseAirportConstruction,SichuanXinjin611430,China)

1

2

1,3

4

5

(1.AirForceEngineeringUniversity,Xi an710038,China;2.66489unitofPeople sLiberationArmy,Beijing100144,China;

Abstract: Inordertostudydynamicconstitutiverelatioinofbasaltfiberreinforcedconcrete(BFRC),theimpactcompressiontestsonBFRCwerecarriedoutwiththe100mm diametersplitHopkinsonpressurebar(SHPB)device.Thedynamicstress straincurveswereobtainedandthetesteddatawereanalyzed.Accordingtotheresultsoftests,superimposingthestrainratestrengtheringfactorandthedamageweakeningfactoruponastaticconstitutivemodelfortheconcreteOttosenmode,lthedynamicconstitutivemodelofBFRCwasestablished.Theparametersweredeterminedandthemodelcurveswerecomparedwiththetestedones.TheresultsshowedthatthereisanobviousstrainratestrengtheringeffectinthedynamicperformancesofBFRC;

thereareapproximatefunctionrelationsamongthedynamicstrength

increasingfactorDIF,thepeakstrainandthestrainratelogarithm;themethodusedtoestablishthemodelisfeasible;the

theoreticalmodelcoincideswiththetesteddatawel;ltheconstitutivemodelcanbeusedtodescribetheimpactbehaviorofBFRCandcanofferanimportantstudyforfurtherstudyandengineeringapplicationofBFRC.

Keywords:basaltfiberreinforcedconcrete;splitHopkinsonpressurebar;dynamicconstitutivemodel

(pp:110-114)