Dynamic Analysis of Plan Asymmetric Moment Resisting Frame Considering Soil Structure Interaction

This paper aims towards the linear dynamic analysis of asymmetric reinforced concrete building considering the effect of soil–structure interaction. Asymmetry in structure can produce a torsional response coupled with translational response during earthquakes. Torsional behavior of structure includes using the design eccentricities. In this paper G+ 8 R.C. moment resisting frame with ‘L’ shape are analyze by Response Spectrum Analysis (with and without considering design eccentricity) and Linear Time History Analysis (with IS code compatible time histories). The analysis and design is carried out as per IS 456:2000, IS 1893(Part-1): 2002 and IS 13920:1993. The supports are modeled as fixed, hinged and effect of SSI is accounted by Winkler’s approach computed in accordance with the soil sub-grade modulus (��) and equivalent spring stiffness according to FEMA-356. Cohesion-less (Ø) soil with medium type is considered. Soil bearing capacity is considered 300kN/m2. Whole analysis is carried out using STAAD.ProV8i SS5. This study reveals that, consideration of design eccentricity and soil structure interaction in seismic analysis has great impact on response of structure.