SEISMIC RESISTIVITY AND RETROFITTING OF RC FRAME BUILDINGS

Generally, in open ground storey buildings, unreinforced brick masonry infill’s are present in all floors except the ground storey. This leads to severe stiffness and strength irregularity and even sometimes leads to torsion irregularity. Buildings with these irregularities has consistently shown poor performance during past earthquakes like 1999 Turkey, 1999 Taiwan and 2001 Bhuj, 2003 Algeria earthquakes and many others. In India, most of the existing as well as new infill RC frame buildings has been designed and are being designed without considering strength and stiffness of Infill’s (bare frame modeling). Due to inclusion of infill’s behavior and failure modes of buildings changes. This leads to serious concern about seismic safety of existing buildings. In the present study, various strengthening techniques for open ground storey will be discussed. This techniques can be broadly categorized in two groups: 1) Strengthening of existing members, 2) Addition of new members. Reinforced Concrete jacketing and Steel jacketing. There are two popular methods; Addition of shear wall Addition of friction dampers. Addition of new shear wall can efficiently be used for buildings with only local interventions.Addition of friction damper is attractive and easy to construct but needs sophisticated method for proper fixation with existing frames. In this study SAP2000 is used to analyze the buildings models. Keywords:-Geo-Polymer, Metakaolin, Ambient curing