COMPARATIVE STUDY OF SEISMIC PERFORMANCE OF RC FRAME BY STATIC PUSHOVER ANALYSIS AND INCREMENTAL DYNAMIC ANALYSIS

STRUCTURE

Structures are designed to resist environmental forces such as lateral forces like wind and earthquake, along with vertical gravity loads such as dead and live loads. These forces are random and dynamic in nature. Response of the structures is dynamic which produces dangerous and difficult situations. Therefore, performance-based design and analysis of the structures is required which is attained by Incremental dynamic analysis (IDA) and static pushover analysis (SPA). Incremental dynamic analysis is reasonably precise and real responses of the structures from the specific considered seismic records are obtained by these methods. IDA includes implementation of numbers of non-linear dynamic analyses in which the intensities of seismic records selected for collapse study are incrementally amplified until the global collapse capacity of the building is achieved. In current study, incremental dynamic analysis of 8 story RC building used for commercial purpose is performed. IDA curve is developed with respect to peak ground acceleration (PGA). Performance levels of building. Yield and collapse should be described with respect of the PGA of the respected seismic records from IDA curves. Serviceability measure for interstorey drift ratio (IDR) specified by various seismic codes are checked by IDA. Structure susceptibility is found out that whether the structure can withstand the considered earthquakes or not are obtained by using incremental dynamic analysis. Serviceability measure for interstorey drift ratio (IDR) specified by various seismic codes are checked by IDA. Variation of deformation responses like displacement and story drift with the intensity of the considered earthquake are also studied with the increment in the intensity of that particular seismic record up to collapse of the building. Static push over analysis of 8 story RC building is also performed, from the static pushover analysis, plot of base shear versus roof displacement is plotted. From the plot, base-shear capacity of the building is obtained. Base shear capacity of that building is also attained by using IDA and capacity curves of base shear versus roof displacement from SPA is compared with that of IDA

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