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1、1982COMPARATIVESTUDYOFTHESEISMICPERFORMANCEOFFRAMESUSINGDIFFERENTDISSIPATIVEBRACES12AlfonsoVULCANOAndFabioMAZZASUMMARYDifferentkindsofdissipativebracesandtheirmodelsaredescribed.Anumericalinvestigationiscarriedoutconsideringthenonlinearseismicresponseofunbraced
2、anddampedbracedframes.Moreprecisely,atypicalfive-storeyreinforcedconcrete(r.c.)frame,whichisdesignedaccordingtoEurocode8,isconsidered.Toprotecttheframe,thefollowingdissipativebracesaresupposedinsertedintotheframeitself:cross-braceswithhysteretic(frictionoryield
3、ing)dampers,chevronbraceswithviscoelasticdamper,diagonalbracewithviscousdamper.Theeffectsproducedbythedissipativebracesontheresponseoftheframedstructureareevaluatedassumingdifferentpropertiesoftheframemembers,bracesanddissipativedevices.Aspectsconcerningthebeha
4、viourandmodellingofthedissipativebracesarediscussed.INTRODUCTIONTheinsertionofdissipativebracesprovestobeeffectiveinordertoenhancetheperformanceofastructuredesignedaccordingtoconventionalaseismicdesigncriteria.Simplifieddesignprocedureswereproposed,whicharebase
5、donthedesignspectrumconceptwithreferencetoasingle-degree-of-freedom(SDOF)systemrepresentingtheactualdampedstructure[FiliatraultandCherry,1990;FuandKasai,1998].However,manyoftheseproceduresarebasedontheassumptionthatthestructuretobeprotected(e.g.,aframe)behavese
6、lastically.Onlyinfewworkstheinelasticbehaviourofthatstructureistakenintoaccount(e.g.,[Vulcano,1994],inthecaseofcrossbraceswithfrictiondampers;[Paolaccietal.,1998],consideringviscoelasticdampers).Inthisperspectiveitisconsideredveryimportanttostudythenonlinearsei
7、smicbehaviourofsingle-ormulti-degree-of-freedomsystemswhichmakeuseofdifferentkindsofdissipativebraces.Indeed,thecomparisonbetweendifferentdampedsystems,consideringaspectsoftheirbehaviourconnectedwithboththestructuralmodelandtheselectionofsuitablevaluesforthecha
8、racteristicparameters,isbelievedbasictodeveloppracticalanalysisanddesignprocedures.InthispapertheaboveaspectsarediscussedinthelightofresultsforaSDOFsystem,whichisrepresentat
