Seismic Analysis of Masonry Infilled Structure with Open Ground Storey and Refuge Storey

Abstract- The study examines the seismic performance of reinforced concrete (RC) frame structures with masonry infill, focusing on the presence of Open Ground Storey (OGS) and Refuge Storey. Utilizing ETABS software, two distinct building plans L-shaped and Box-shaped are modeled to assess their seismic performance across different seismic zones as per IS 1893:2016. These features create a soft-storey condition, making them vulnerable to collapse during earthquakes. The study compares structures with and without infill walls across different seismic zones of India. Results show higher vulnerability in structures with OGS and refuge floors, requiring enhanced load-resisting systems and ductile detailing. The analysis is performed on dynamic analysis by Response spectrum method using computer software E-TAB. The study recommends design recommendations and mitigations startegies to improve seismic resilience. Keywords: Response Spectrum Analysis, Masonry Infills, Open Ground Storey, Refuge storey, E-TAB, Different Seismic Zones, L-Shape & Box Shape