The effect of soil–structure interaction on damage index of buildings

摘要: Abstract The effect of Soil–Structure Interaction (SSI) on Park and Ang Damage Index in a Bilinear-SDOF model is investigated under seismic loading. This done through an extensive parametric study. Two non-dimensional parameters are used as the key which control severity SSI: (1) frequency structure-to-soil stiffness ratio index (2) aspect structure. soil beneath structure considered homogeneous elastic half space modeled using concept Cone Models. system then subjected to three different earthquake ground motions representative recorded conditions. analysis directly time domain direct step-by-step integration method. results presented form damage spectra for wide range parameter variations. It observed that generally SSI increases before threshold period closely related predominant motion. means conventional fixed-base underestimates damages sustained by buildings having periods less than this period. In particular, substantially short-period located soft soils. also increasing effect. However, trend reversed after