1 - Acta Technica Corviniensis

ACTA TECHNICA CORVINIENSIS – Bulletin of EngineeringFigure 5. Framed hingesRESULTS AND DISCUSSIONSThe resulting pushover curve for the G+2 building isshown in Figure 4. The curve is initially linear but startto deviate from linearity as the columns undergoinelastic actions. When the building is pushed well intothe inelastic range, the curve become linear again butwith a smaller slope. The curve could be approximatedby a bilinear relationship.Plastic hinges formation for the building mechanismshave been obtained at different displacement levels.The hinging patterns are plotted at different levels infigures 8 to16. Plastic hinges formation starts at basecolumns of lower stories, then propagates to upperstories and continue with yielding of interiorintermediate columns in the upper stories.Figure 6. Deformed shape at step 0Figure 7. Deformed shape at step 1Figure 9. Deformed shape at step 3Figure 10. Deformed shape at step 4CONCLUSIONSUnder the pressure of recent developments, seismiccodes have begun to explicitly require theidentification of sources of inelasticity in structuralresponse, together with the quantification of theirenergy absorption capacity. Many existing buildingsdo not have been designed for seismic forces. It isimportant to study their response under seismicconditions and to evaluate seismic retrofit schemes.Hence push over analysis has been gaining importancefor the strengthening and evaluation of the existingstructures. By conducting the pushover analysis onflat slabs, pushover curve and demand curve can beobtained. Then, based on the results we need todecide whether to perform rehabilitation orretrofitting depending upon the seismic zone of theexisting structures.REFERENCES[1] Push over analysis on shear critical frames, SerhanGuner and Frank J. Vecchio[2] Seismic retrofit of columns in buildings for flexureusing concrete jacket.Gnanasekaran Kaliyaperumal andAmlan Kumar Sengupta[3] Pushover analysis of reinforced concrete framestructures. A. kadid and A. boumrkik department ofcivil engineering, university of Batna, Algeria[4] ISET Journal of Earthquake Technology, Paper No. 505,Vol. 46, No. 2, June 2009, pp. 77–107[5] Asian Journal of civil engineering (Building andHousing)Vol. 9, No. 1 (2008) Pages 75‐83[6] CI Structural Journal/January‐February 2010 by SerhanGuner and Frank J. VecchioACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERINGISSN: 2067‐3809 [CD‐Rom, online]Figure 8. Deformed shape at step 2copyright © UNIVERSITY POLITEHNICA TIMISOARA,FACULTY OF ENGINEERING HUNEDOARA,5, REVOLUTIEI, 331128, HUNEDOARA, ROMANIAhttp://acta.fih.upt.ro242012. Fascicule 3 [July–September]