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Dynamic Analysis of Infills on R.C Framed Structures

Manju G

While during building construction, the frame structures are constructing first due to ease of construction and later the frames are infilled by masonry brick infill or concrete blocks or finished stones or concrete hallow blocks. The infill walls are giving protection from outside environment like external walls and also divide the inside structure like as partition walls. Predicting the behaviour of infill while during seismic action is difficult because it is brittle and ductility in nature. The IS code provisions do not provide any guidelines for the analysis and design of RC frames with infill wall, so during the analysis infilled frame is considered as bare frame and neglecting effect of infill on frame. In this study, we carried a effect of infills on bare frame, masonry infill and soft storey models. The vertical discontinuity of stiffness in the structure called as soft storey. The soft storey are considering in different floors for different models like at ground floor, first floor, second floor, third floor and last floor. All the models are analysed by response spectrum analysis and infills are modelled by equivalent diagonal strut. Following parameters are determining like time period, displacement, storey shear, column forces and axial forces in columns