Performance Based Seismic Analysis on Building with Podium Structure by Considering LSA and tha Methods
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Performance Based Seismic Analysis on Building with Podium Structure by Considering LSA and tha Methods
Shubham Pradip Jadhav*1 Dr. Sangketa Sangma*2 Dr. S. G. Ban*3
*1, M. Tech Student, Department of Civil Engineering, G. H. Raisoni College of Engineering & Management,
Pune, Maharashtra, India.
*2, Professor, Department of Civil Engineering, G. H. Raisoni College of Engineering & Management, Pune,
Maharashtra, India.
*3, H.O.D, Department of Civil Engineering, G. H. Raisoni College of Engineering & Management, Pune,
Maharashtra, India.
ABSTRACT: Podium-supported high-rise buildings have become increasingly common in urban areas as they allow efficient land utilization while separating commercial and residential functions; however, the introduction of a podiumcreates irregularities in stiffness and mass distribution that significantly influence seismic behaviour. This study presents a performance-based seismic evaluation of areinforced concrete (RC) structure consisting of two basement levels, a ground floor, and twenty-three storeys above a podium, modelled and analysed using ETABSsoftware through both Linear Static Analysis and Time History Analysis methods. To assess structural response under varied seismic conditions, ground motion records from the Bhuj, El-entro, and Nepal earthquakes are applied, representing different characteristics of seismic excitation. The results indicate that Time History Analysis provides a more realistic and accurate representation of the building’s dynamic response, particularly in structuresexhibiting stiffness and geometric irregularities, whereas Linear Static Analysis tends to produce higher estimates ofmaximum storey displacement and drift, highlighting its limitations in capturing complex structural behaviour under dynamic loading. Overall, the study emphasizes the importance of adopting dynamic analysis techniques for a more reliable assessment of seismic performance in podium type high-rise structures.Keywords: Podium structure, Linear static analysis, Time history analysis.
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