Seismic Evaluation and Retrofitting of Open Ground Storey
Author(s):
Samruddhi Sanjay Borkar , G. H. Raisoni College of Engineering, Nagpur; N. H. Pitale, G. H. Raisoni College of Engineering, Nagpur
Keywords:
existing building, insufficient stiffness, open ground storey, pushover analysis, response spectrum analysis, storey-drifts
Abstract:
Generally, in open ground storey buildings, unreinforced brick masonry infills are present in all floors except the ground storey. This leads to severe stiffness and strength irregularity and even sometimes leads to torsion irregularity. Buildings with these irregularities have consistently shown poor performance during past earthquakes. Normally, infills are considered as non-structural member; however, practically it provides significant stiffness under lateral load. If special provisions have not been followed in design, absence of infill at ground storey will lead to formation of soft ground storey. Under lateral loading, lack of infill stiffness will lead to larger inter-storey drift concentrated to ground storey leading to an early formation of plastic hinges, further impending collapse of structure. For this purpose, performance based analysis of soft storey structure was carried out. An existing open ground storey building with G+5 storey have been considered in zone V. Infill walls are modelled using procedure given in FEMA. Linear dynamic response spectrum analysis &Non-linear static pushover analysis has been done & studied effects of infills on dynamic characteristics, yield patterns, seismic performance using SAP 2000. Time period and base shear was obtained & compared by linear analysis. The pushover curves between base shear & displacement are plotted and compared.
Other Details:
Manuscript Id | : | IJSTEV3I10198
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Published in | : | Volume : 3, Issue : 10
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Publication Date | : | 01/05/2017
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Page(s) | : | 338-347
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