Optimal scalar and vector intensity measures for seismic vulnerability analysis of RC frames considering soil–structure interaction effects
Authors :- Goyal, A.K., Gade, M. & Sharma, N.
Publication :- Sādhanā (IAS) 50, 212 (2025).
The present study aims to identify optimal scalar and vector intensity measures (IMs) for evaluating the seismic performance of reinforced concrete (RC) buildings with soil–structure interaction (SSI) effects. Nonlinear dynamic time history analyses of different frame configurations representing low-rise, mid-rise and high-rise RC buildings supported on soft soil conditions were conducted using 50 unscaled ground motions to assess the engineering demand parameters (EDPs). Efficiency and sufficiency analyses were employed with a set of 22 IMs to determine the most effective ones for predicting the seismic responses of RC buildings under the influence of SSI. The results show that structure-specific IMs are more effective than non-structure-specific IMs for predicting the response. Moreover, scalar IMs are optimal for peak roof displacement, whereas vector-valued IMs are more suitable for peak inter-storey drift ratio. The insights gained from the study can aid in selecting the optimal IMs for seismic vulnerability and risk analysis of RC buildings under the influence of SSI.