Seismic Behavior of RC Frame Building and Its Analysis with Improving Measures

Abstract

The infill masonry walls are seldom included in analysis of reinforced concrete structural systems, since masonry panels are generally considered as non-structural components. However, these panels affect the structural response, although the complexity they introduce to analysis. The effects of masonry infill on the global seismic response of reinforced concrete structures arethe part of study. Recently, it becomes important to determine the earthquake behavior of structures with infill walls in earthquake engineering. Parametric analyses on a large variety of multi-storey infill reinforced concrete structures show that, due to the hysteretic energy dissipation in the infill, if the infilling is uniform in all storey, drifts and structural damage are dramatically reduced, without an increase in the seismic force demands. Presence Soft-storey effects due to the absence of infill in the bottom storey in building is a measure problem in earthquake, as soft storey is significantly less strong or more flexible, a large portion of the total building deflection tends to concentrate in that floor with consequent concentration of stress at the second floor connections and in that case collapse is unavoidable. Open first storey is a typical feature in the modern multistory constructions in urban India. Such features are highly undesirable in buildings built in seismically active areas; this has been verified in numerous experiences of strong shaking during the past earthquakes. The present study highlights the seismic performance of RC frame building with soft stories at first as well as at different floor level. A parametric study is performed on an example building with soft storey and it is intended to describe the performance characteristics such as stiffness, shear force, bending moment, drift. The effects of masonry infill and cross bracing on above parameters have been studied for a building with soft storey. The modeling and post-processing is carried out using ANSYS software. The comparisons of different parameter of models have also been presented in the study.