EFFECT OF INFILL IN EARTHQUAKE RESISTANT BUILDINGS

Abstract

Infilled frame structures are commonly used in buildings. Masonry infilled RC frames are the most common type of structures used for multi-storey constructions in developing countries. But these infills are considering as the non-structural members. In the present study an attempt was made to highlight the effect of infill in the earthquake resistance buildings. A square, rectangular and L shaped buildings were considered with 25% openings and with full infill. Pushover analysis was carried out on bare frame, strut frame, strut frame with 25% central openings in X direction, by using computer aided software SAP2000 from which different parameters such as base shear, displacement and performance point were computed. Buildings with infill were observed to have more initial stiffness in elastic state and less drift than bare frame at the end of the analysis. In L shaped building(45m*45m*32m) the infill was placed in the direction of push up to 35m from the exterior end. The displacement observed at the exterior corner point of L shaped building using infill was found to 28% more than the displacement at interior point in bareframe.