DIANA钢筋混凝土框架填充墙加固抗震分析.pdf
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1、Nonlinear FE Analysis of RC Frames Infilled with RC Walls for Seismic Retrofitting in DIANA FEAElpida Georgiou-PhD CandidateSupervisor-Professor Christis Chrysostomou21 November 2017Department of Civil Engineering and GeomaticsCUT is a new state University in Cyprus Growing within the historical cit
2、y center of LimassolCUT was founded in 2004 and welcomed its first students in 2007 Offers academic degree programs at all levels(Undergraduate,Masters,PhD)17 Undergraduate Programs of Study 32 Graduate Programs of StudyThe faculty of Engineering and Technology Department of Electrical Eng.Computer
3、Engineering and Informatics Department of Mechanical Eng.And Materials Science and Engineering Department of Civil Engineering and Geomatics CYPRUS UNIVERSITY OF TECHNOLOGYGeneral dataThe youngest among the leading Young Universities in EuropeCyprus University of Technologybetween 350-400 in the wor
4、ld202 in EuropeIn less than 10 yearsOverviewResearch purposeProcedureExperimental studyGeometry,design,tests,resultsModel in DIANA FEAGeometry definition,elements,mesh,material models,loads,analysisDIANA FEA results comparison with experimental resultsOutcomesFurther workDIANA FEA Webinar Research P
5、urposeStrengthening of existing structures with RC infills within existing frames Limitations in design and construction regardingthis method further investigation is requiredContribution of shear connectors(dowels)Important component of the overall shear resistance capacity of RC Not been yet analy
6、zed adequately Complicated mechanism Not clear how to design them A parametric study is necessarySimulation of a full-scale Ps-D test in DIANA FEA Numerical experiments Global&Local resultsDIANA FEA Webinar Original FrameRetrofitted FrameProcedurePrototype model-SERFIN project-Full-scale case study-
7、Model correctly reflects the real situation-Results&dataDIANA FEA for simulation-FEM of the frame to represent the experiment-Validation with experimental results-Nonlinear hysteretic behavior of materials at the local level-Capture and evaluate the behavior of RC infillsReliable study of any buildi
8、ng parameter-Numerical experiments and parametric studies DIANA FEA Webinar Experimental studySERIESSeismic Engineering Research Infrastructures of European Synergies European Commission,Framework Programme 7SERFIN projectSeismic Retrofitting of RC Frames with RC Infilling First time in the world a
9、full-size test of this type of specimen 18 months(December 2013 July 2015)European Laboratory of Structural Assessment(ELSA)of the Joint Research Centre in Ispra(Italy)Important Experimental results&DataStructural Engineering International Journal of IABSE,23(2),159-166,(2013)-http:/ Scientific and
10、Technical Research Reports,(2013)-https:/ec.europa.eu/jrc/en/publication/eur-scientific-and-technical-research-reports/seismic-retrofitting-rc-frames-rc-infilling-serfin-project-series-transnational-accessParticipants:Cyprus University of Technology CoordinatorUniversity of Nantes(France)University
11、of CyprusDENCO Design&Engineering Consultants(Greece)DIANA FEA Webinar The specimen-geometryRC infilling 2 end exterior frames only Spaced at 6m Linked by a 0.15m thick RC slab and 4 transverse beams 35x65 RC infill wall has the same thickness as the width of the frame members(0.25m)Central bay 2.5m
12、/Two exterior bays 3m(centre to centre)Columns 25x40,Beams 25x50Multi-storey 4-storeys Total specimen height 12m-excluding the foundation Storey height 3mMulti-bay 3-bays Centre-line length of the specimen was 8.5mDIANA FEA Webinar EASTWESTSOUTHWALLThe specimen-designDesign standard Typical building
13、 in the 70s-80s in CyprusNo specific design standardNo provisions for earthquakeCP110:1972,BS8110:1983LoadsGravity loads only(vertically loaded)Dead load:3kN/mLive load:1.5kN/mMaterialsConcrete C20/25 Unit weight 25kN/m E=30GPaReinforcement steel fyk:400MPa existing structure fyk:450MPa RC infill do
14、welsDIANA FEA Webinar The specimen design detailsColumns reinforcement 4Y20 longitudinal Spliced right above each slab with 550mm length Y8/200 stirrupsColumn cross-sectionTransversal Beams reinforcement 2Y20 top 5Y20 bottom Y10/150 stirrupsReinforcement detailfor beamsLongitudinal beamcross-section
15、Transversal beamcross-sectionReinforcement detailfor columnsLongitudinal Beams reinforcement 4Y12 top+bottom Y8/200 stirrupsDIANA FEA Webinar The specimen design detailsRC Infills&DowelsDifferent amounts of reinforcement for the infills With the north one being the stronger of the twoTwo distinct co
16、nnection detailsWall reinforcement and connection details between the walls and the bounding frameDIANA FEA Webinar The specimen design detailsDowels and starter barsDowels,starter bars and web reinforcementDIANA FEA Webinar Short dowelsDowels and starter barsRC Infills&DowelsFirst detail Starter ba
17、rs Web bars connected with the surrounding frame through lap splicing Same diameter starter bars Epoxy grouted into the frame members Short dowels Transfer the shear at the interface between the wall and the frame memberThe specimen design detailsRC Infills&DowelsSecond detail Longer dowels Act both
18、 as dowels and as starter bars of the web reinforcement These dowels are considered as lap-spliced The clear distance between the dowel and the nearest web bar,violated the maximum clear distance of 50mm or 4between lapped bars(Specified in Eurocode 2(CEN,2004)DowelsDowels and web reinforcementDIANA
19、 FEA Webinar DowelsThe specimen design detailsDowels first detail was used to connect the wall:Bottom beam 2ndfloor bottom beam Left(west)column of the ground floor Right(east)column of the 1stfloorDowels second detail was used to connect the wall:Top beam of the all floors Bottom beam of the 3rdand
20、 4thfloors Left(west)of the 2nd,3rd,and 4thfloors Right(east)of the 1st,3rdand 4thfloorsDIANA FEA Webinar The specimen design details3-sided CFRP reinforcement jacket to reinforce the edges of the wall at the ground floorThis additional retrofit on the lap length is crucial and constitutes part of t
21、he proposed retrofit strategy to avoid premature tensile lap-splice failureDIANA FEA Webinar The specimen-transducers 108 Displacement transducers 22 Inclinometers 8 Heidenhain linear encoders Elongation/Shortening Rotations Beam supports(Opening/Closing)Beam-middle(Slip)Column(Slip)Shear Deformatio
22、nDIANA FEA Webinar The specimen-testsHorizontal loadingUni-directional pseudo-dynamic(Ps-D)testing 0.1g acceleration 0.25g accelerationCyclic Displacement history was imposed at the top storey Triangular distribution of forces was imposed 92,-92,89,-125,37,0(mm)Actuator attachment beamsHerzeg Novi(M
23、ontenegro 1979)accelerogram scaled to 0.25gDIANA FEA Webinar The specimen Global Results0.25g acceleration test Higher level of damage for the south frame A crack at the ground floor beam of the foundation at the base of the wall A tensile lap-splice failure appeared in the outer column at the east
24、side of the south frameCrack opens at the bottom of the column-wallTensile lap-splice failure of the column at the bottomCrack opens at the bottom of the column-wallFailure of the lap splice jointS frame N frameHairline cracks develop in the wallDIANA FEA Webinar The specimen Global Results0.25g acc
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- DIANA 钢筋混凝土 框架 填充 加固 抗震 分析