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Seismic Response of RC Building by Considering Soil Structure Interaction

Jinu Mary Mathew1, Cinitha A2, Umesha P K2, Nagesh R Iyer2, and Eapen Sakaria1
1. Saintgits College of Engineering, Kottayam
2. CSIR-Structural Engineering Research Centre, Chennai-113

Abstract—This study is to investigate the effect of earthquake motions on the response of a three- dimensional nine storey reinforced concrete structure with and without considering soil-structure interaction. Numerical modelling of such analysis requires the determination of the nonlinear properties of each component in the structure, quantified by strength and deformation capacities. Nine storey RC building asymmetric in plan, height below 45 m, located in seismic zone III designed as per IS 456:2000 and IS1893:2002 and detailed as per IS13920:1993. Properties of nonlinear hinge properties are computed as per FEMA-356 and ATC 40 guidelines. Pushover analysis is carried out in X- and Y- directions using user-defined nonlinear hinge properties. The analysis has been carried out for the three different cases: (1) Fixed base without considering soil structure interaction (SSI), (2) Flexible base by considering SSI in hard soil condition, and (3) Flexible base by considering SSI in soft soil condition. It was found that SSI can affect the seismic performance of building in terms of seismic force demands and deformations. From the capacity curve, it is observed that SSI effects are significant for soft soil conditions and negligible for stiff soil conditions. 

Index Terms—soil structure interaction, push-over analysis, plastic hinge, seismic performance

Cite: Jinu Mary Mathew, Cinitha A, Umesha P K, Nagesh R Iyer, and Eapen Sakaria, "Seismic Response of RC Building by Considering Soil Structure Interaction," International Journal of Structural and Civil Engineering Research, Vol. 3, No. 1, pp. 160-172, February 2014.