[2] 1, 2007 (GB 1, [3-4] ) [6],, :, (Buckling-restrainedBrace, BRB) 3 BRB X A 2, 3, 5 : (Incre- 2 mentaldynamicanalysis, IDA) [5] IDA

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1 JournalofArchitectureandCivilEngineering Vol.28 No.2 June2011 : (2011) RC 1,2 1,2 1,2 1,2 3 (1.,100084;2.,100084; 3.,100124) : RC (BRB) 3, (IDA), :, BRB BRB ;,A X : ;RC ; ; ; :TU352 :A StrengtheningEffectAnalysisofSeismicColapseResistanceof TypicalRCFrameStructuresin WenchuanEarthquake LU Xin-zheng 1,2,MA Yu-hu 1,2,TANG Dai-yuan 1,2,YELie-ping 1,2,HAN Qiang 3 (1.DepartmentofCivilEngineering,TsinghuaUniversity,Beijing100084,China;2.KeyLaboratoryofCivil EngineeringSafetyandDurabilityofMinistryofEducation,TsinghuaUniversity,Beijing100084,China; 3.KeyLaboratoryofUrbanSecurityandDisasterEngineeringofMinistryofEducation, BeijingUniversityofTechnology,Beijing100124,China) Abstract:Taking atypicalreinforced concrete (RC)framestructurethat wasclosetothe epicenterduringthe WenchuanEarthquakeasbackground,theseismiccolapseresistanceofthe frame was strengthened by atached substructures,including conventional brace,buckling- restrainedbrace(brb)andviscousdamperbrace.seismiccolapsefragilityanalysismethodbased onincrementaldynamicanalysis(ida)wasimplementedforeach strengthening schemeto comparetheirefectsandtoanalyzetheinfluenceofcriticalparameters.theresultsshowthat theviscousdamperbracestrengtheningschemeperformsbeterthanthe BRB,andthe BRB performs beter than conventional brace. With the same strengthening parameters,the strengtheningefectofa-shapedbracingschemeisbeterthanthatofthex-shapedscheme. Keywords: Wenchuan Earthquake;reinforcedconcreteframestructure;colapsepossibility; seismiccolapseresistance;incrementaldynamicanalysis M8.0, (GB ) [1] : : (2009BAJ28B01); ( ); (2010-ZD-4); (EESR ) : (1978-),, luxz@tsinghua.edu.cn

2 2011 [2] 1, 2007 (GB 1, [3-4] 50011 2001) [6],, :, (Buckling-restrainedBrace, BRB) 3 BRB X A 2, 3, 5 :

1 SeismicDamageofBuildingsinXuankou, MiddleSchool Fig.3 3 Fig.

2 [2] 1, 2007 (GB 1, [3-4] ) [6],, :, (Buckling-restrainedBrace, BRB) 3 BRB X A 2, 3, 5 : (Incre- 2 mentaldynamicanalysis, IDA) [5] IDA ( 20 ),,,, RC 1, IDA Fig.1 SeismicDamageofBuildingsinXuankou, MiddleSchool Fig.3 3 Fig.2 2 StrengtheningSchemesofClasroomBuildings ( :mm) PlaneofClasroomBuilding(Unit:mm) 1: I25A 2 1 ( :I25) 2: I20A 2 1 ( :I20) 3: I20A 4 1 ( :I20-1/2) 4: I20A 8 1 ( :I20-1/4) 5: I20A 12 1 ( :I20-1/6) 5, 6 1,

3 2 : RC 23 BRB, 4 2 1, F D F D = DV (1) :D ;V Fig.4 4 ; ; ViscousDamperBraceStrengtheningScheme D[D= ~ N (m s -1 ) -1 ] ( IDA AT-63 ) - [7] 22, ElCentro, 6 THUFIBER [8], [6], Bousalem, [9], THUFIBER, 2, ( ), (, ), 2.1 5,K 0 + Ku +,N,ε,N + y Nu + N - y Nu - IDA, 2.3 IDA Nu + =αn +, y N - y =βn +, y Nu - =αc β N +, y εy εp IDA,,εclose,, 7 1, εclose=ωεp Nmax +, 7, N + max=d + Nmax0,εmax + Nmax0 +,d + ;, 1 S,d + =1.0- Eh,ef a ),K u + =K0 + εmax/εy -α k, 3.0CN y0εy0 [3] [7] [8] E h,ef,n y0 εy0 1 R CMR,α β γ αc αk η ω η c η soft C, 50% 5 Fig.5 HysteresisModelofConventionalBrace k dmax [9] : ; ;

4 Tab.1 CalculationResultsofColapsePosibilityof ConventionalBraceStrengtheningScheme X /% A /% R CMR=S a ) 50% /S a,mce ) (2) I I I20-1/ I20-1/ I20-1/ %, S a ) 50% R CMR,R CMR 7 : [S a )=S a,mce )] [S a )=2S a,mce )] ; [S a )>4S a,mce )] ( 7), RC, 2 :,, ;,, 1,, 8 8(a), Kobe (1995 ) S a ) 2.5m s -1 S a ) 4.9m s -1 (11~12s),, :S a ) 50% 50% 8(b) Duzce (1999 ) ;S a,mce (T 1 ) S a ) 7.35 m s -1,

5 2 : RC BRB ( ) - 10,BRB, Fig.8 8 FailureModesofConventionalBrace StrengthenedStructure S a ) 4.9m s -1 Duzce 1,, I20,IDA 9 9,A X 10 BRB Pushover X Fig.10 PushoverAnalysisResultsofBRB, StrengtheningScheme 3.3 IDA 9 IDA Fig.9 ComparisonsAmongIDAColapsePosibility CurvesofConventionalBraceStrengtheningScheme 3 BRB 3.1 BRB,BRB I20-1/ [10] I20-1/ ,BRB I-20,A X BRB BRB IDA, ,, Tab.2 2 BRB CalculationResultsofColapsePosibilitiesof BRBStrengtheningScheme X /% A /% I I I20-1/ BRB

6 BRB Fig.13 ComparisonsBetweenColapsePosibilityCurvesof BRBandConventionalBraceStrengtheningScheme 3 Tab.3 CalculationResultsofColapsePosibilitiesof ViscousDamperStrengtheningScheme D/[10 6 N (m s -1 ) -1 ] /% ,(A ) X X ;BRB BRB (I20-1/2 I20-1/4), 13 BRB 13,,BRB 5, BRB (1) BRB BRB 4 ; IDA ;A X, D, 3 14 A (2) BRB, ( ) (, 14 IDA Fig.14 IDAColapsePosibilityCurvesofViscous DamperStrengtheningScheme ,,A ; )2

7 2 : RC 27 [3]. LU Xin-zheng,YE Lie-ping,MIAO Zhi-wei.Elasto- [J].,2009,30(6): plastic Analysis of Buildings Against Earthquake YELie-ping,LU Xin-zheng,ZHAO Shi-chun,etal. [M].Beijing:China Architecture & BuildingPress, Seismic Colapse Resistance of RC Frame Struc [9] tures CaseStudiesonSeismic DamagesofSeveral BOUSALEM B,CHIKH N.DevelopmentofaCon- RCFrameStructuresUnderExtremeGround Motion fined Model for Rectangular Ordinary Reinforced in Wenchuan Earthquake[J].Journal of Building Concrete Columns [J].Materials and Structures, Structures,2009,30(6): ,40(6): [4]. [10]., 54-57,29. [5]. IDA, [J].,2010,32(1): : LU Xin-zheng,YE Lie-ping.Study onthe Seismic References: ColapseResistanceofStructuralSystem[J].Earth- [1] GB [S]. GB ,CodeforSeismicDesignofBuilding [S]. [2] [D]. :, [J]. MA Yu-hu.SeismicDamageSimulationandColapse,2008,29(4):1-9. ResistanceStrategiesofTypicalRC Frames During CivilandStructuralGroupsofTsinghua University, thegreat WenchuanEarthquake[D].Beijing:Tsing- SouthwestJiaotong Universityand BeijingJiaotong huauniversity,2010. [7] University.AnalysisonSeismicDamageofBuildings ATC-63,QuantificationofBuildingSeismicPerform- ancefactors[s]. inthe WenchuanEarthquake[J].JournalofBuilding Structures,2008,29(4):1-9. [J].,2009,39(11):54-57,29. YELie-ping,LIYi,PAN Peng.SeismicDamagesof Building Structures of Xuankou Middle Schoolin YingxiuTown[J].BuildingStructure,2009,39(11): quakeresistantengineeringand Retrofiting,2010, 32(1): [6]. [8],. [M]. :,2009. [D]. :,2007. CHENG Guang-yu.Studyon Energy-based Seismic Design Methodologyand ApplicationinSteelBraced Frames[D].Beijing:TsinghuaUniversity,2007.

Fig. 1 Frame calculation model 1 mm Table 1 Joints displacement mm

Fig. 1 Frame calculation model 1 mm Table 1 Joints displacement mm 33 2 2011 4 ol. 33 No. 2 Apr. 2011 1002-8412 2011 02-0104-08 1 1 1 2 361003 3. 361009 3 1. 361005 2. GB50023-2009 TU746. 3 A Study on Single-span RC Frame Reinforced with Steel Truss System Yuan Xing-ren