A Review of Open Ground Multistorey Building Structure for Different Seismic Zone Conditions

Civil Engineering

Open ground storey (OGS) buildings are buildings on stilt floors which provide for vehicle parking space in the ground floor. Such buildings where the mass and stiffness are not uniform are called irregular buildings and are known to perform poorly under seismic loading. As a result, the Indian code for evaluating earthquake loads on buildings penalizes these buildings by requiring their ground storey to be designed for two-and-a-half times the estimated base shear for a similar non-open ground storey building with no conditions on required stiffness. However, this may lead to undesirable performance because the ground storey columns are likely to get heavily reinforced and as a consequence have reduced levels of ductility. Also, since most of the lateral deformation of the building is likely to be concentrated at the ground storey, the storey deformation is likely to exceed the stipulated values even under minor or moderate earthquakes thus causing performance problems. In this study, the performance of G+4, G+5 and G+10 storeyed OGS plane frames, designed and detailed as per the Indian Codes, and by response spectrum analysis can be selected for analysis work.

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