Seismic Performance of Open Ground StoreyBuilding Coupled with Shear Wall ConsideringInfill Wall Stiffness - A Case Study

Abstract

An open ground storey (OGS) is a sort of building plan in which the ground floor or lower levels of a structure include open spaces that are not surrounded by walls or columns, such as parking areas, commercial spaces, or lobbies. OGS buildings are known to be at risk of structural damage and collapse during an earthquake due to a lack of stiffness and strength in the open ground storey, which underestimates inter-level drift and force demand in ground storey columns. To compensate, multiple methods of fragility analysis are used to predict the possibility of the building failing at a certain Peak Ground Acceleration (PGA). The current study focuses on the seismic performance of OGS structures coupled with shear walls; the chosen building is designed in accordance with the ACI code. They were employed during dynamic time-history analysis to develop the dis- placement profile of the structure by constructing synthetic earthquakes based on the UBC 1997 response spectrum. For each of the selected OG’S buildings, probabilistic seismic demand models (PSDM) and accompanying fragility curves have been developed for various performance levels. For reference, similar studies are performed on bare frames as well as on infilled frames. It is found from the present study that the infilled walls have a slight influence on the building due to the presence of shear walls as they are known for good resistance to lateral loads nevertheless the infilled walls showed a slight reduction of the building displacement.