Open Ground Storey (OGS) framed buildings where the ground storey is kept open without infill walls, mainly for parking, is increasing commonly in urban areas. Vulnerability of this type of buildings was exposed in the past earthquakes. OGS buildings are conventionally designed considering a bare frame analysis ignoring the stiffness of the infill walls present in the upper storeys. This analysis ignoring the stiffness of infill walls underestimates...