COMPARISON OF SEISMIC PERFORMANCES OF REINFORCED CONCRETE FRAMES STRENGTHENED BY DIFFERENT TECHNIQUES

Abstract

THE AIM OF THIS STUDY IS TO COMPARE THE SEISMIC PERFORMANCES OF STRENGTHENING TECHNIQUES APPLIED TO REINFORCED CONCRETE (RC) NON-DUCTILE FRAMES WHICH WERE TESTED UNDER THE EFFECTS OF SEISMIC LOADS. IN THE EXPERIMENTAL PART OF THE STUDY, ONE-THIRD SCALE, ONE-BAY, TWO-STOREY NON-DUCTILE HOLLOW BRICK INFILLED RC FRAMES WERE STRENGTHENED WITH FIVE DIFFERENT TECHNIQUES AND TESTED UNDER REVERSED CYCLIC LATERAL LOADS. ONE BEING A REFERENCE FRAME, FIVE OF THE TEST FRAMES WERE INFILLED WITH HOLLOW BRICKS AND PLASTERED ON BOTH SIDES, ONE FRAME WAS STRENGTHENED WITH PLAIN MORTAR, ONE WAS STRENGTHENED WITH STEEL FIBER REINFORCED MORTAR, TWO WERE STRENGTHENED WITH PRECAST RC PLATES. THE LAST TEST FRAME WAS STRENGTHENED WITH RC INFILL WALL. TEST RESULTS WERE EVALUATED IN TERMS OF STRENGTH, STIFFNESS, INTERSTOREY DRIFT RATIO, ENERGY DISSIPATION CAPACITY, SPECIMEN FAILURE MODE, EASE OF APPLICATION AND COST ECONOMY POINTS OF VIEW. IN THE TESTS, DIFFERENT EFFECTIVENESS ON STRENGTH AND STIFFNESS CHARACTERISTICS OF THE TEST FRAMES WERE OBSERVED FOR EACH STRENGTHENING TECHNIQUE. STRENGTHENING TECHNIQUES INCREASED STRENGTH AND STIFFNESSES OF THE TEST FRAMES IN THE RANGES FROM 57% TO 189% AND FROM 186% TO 486% RESPECTIVELY. IN THE ANALYTICAL PART OF THE STUDY, AN EXISTING RC NON-DUCTILE BUILDING LOCATED IN ISTANBUL, STRENGTHENED WITH THE TECHNIQUES, WERE ANALYZED USING A COMPUTER PROGRAM. ANALYTICAL RESULTS WERE EVALUATED IN TERMS OF INTERSTOREY DRIFT RATIO TOGETHER WITH THE OVERALL SEISMIC PERFORMANCE OF THE BUILDING.