A Simplified Method for Seismic Vulnerability Assessment of RC Buildings With Open Ground Storey

Abstract eng:
RC buildings with open ground storey (OGS) are commonly constructed in many countries where the ground storey is left open (i.e., without infill walls) primarily for parking or business purposes. Such buildings have performed quite poorly even during moderate shakings in the past. The presence of infills only in the upper stories make them significantly stiffer as compared to the open ground storey. Thus, most of the lateral displacement of the building is concentrated in the ground storey itself with a very little relative lateral deformation of the upper stories. As a result, the OGS columns are not able to resist the high ductility demand imposed on them during earthquakes leading to severe damage or collapse of the entire building. This calls for a need to understand and qualify such building construction for seismic performance in earthquakeprone countries and classify them into groups based on its seismic vulnerability. As OGS frames are found to be most vulnerable building with any configurations, a parametric study was carried out with different number of bays and stories, and varying central opening sizes in infills of the frame. Seismic displacement demand of the frames is assessed based on ATC 40 performance assessment methodology. The results of seismic performance assessment were used to develop a simple numerical model for quick estimation of spectral displacement demand for OGS frames based on multiple variable linear regression for large building inventory including low to mid rise buildings. Further, the effectiveness of the developed regression model for spectral displacement demand estimation (and hence fragility assessment) was demonstrated using some examples.

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