ANALYSIS OF RC FRAME WITH AND WITHOUT MASONRY INFILL WALL WITH DIFFERENT STIFFNESS WITH OUTER CENTRAL OPENING

Abstract

In reinforced concrete frame building, masonry wall are generally used in as infills and specified by architects as partitions in such a way that they do not contribute to the vertical gravity load-bearing capacity of the structure. Infill walls protect the inside of the buildings from the environment hazards and create separation insides. In addition to this infills have a considerable strength and stiffness and they have significant effect on the seismic response of the structural systems. Mostly two common structural damages observed caused by masonry infill walls in earthquakes i.e soft stories and short columns. In office or residential building outer side central opening are used. In this case central opening are provided in periphery wall with different percentage i.e. 15% and 25% and brick compressive strength are used as per IS : 1905-1987 i.e. 5.0 and 12.5 N/mm 2 and Brick Masonry strength is 0.50 and 1.06N/mm 2 . In ETABS software G+9 R.C.C framed building models has been prepared, Seismic coefficient method(SCM) and time-history(TH) has been performed for analysis as per IS 1893:2002. Story displacement, base shear, story drift, axial force with and without soft story considering effect of infill walls with different percentage of opening are the parameters considered in this study. For Macro model, Equivalent diagonal strut (EDS) method is used to find out width of strut using FEMA approach method. The results of bare frame, soft story and infill wall panel are discussed and conclusions are