Current Concepts in Engineering Research and Technology Vol. 4

The rapid growth of urban infrastructure has led to the widespread construction of tall reinforced-concrete (RC) buildings with irregular geometries to meet architectural and functional requirements. However, structural irregularities significantly influence the dynamic behaviour of buildings, particularly when they are subjected to dynamic wind-induced forces. Furthermore, the interaction among the structure, foundation, and supporting soil plays a crucial role in determining the overall response of such an interaction system. The present study investigates the structural response of a G+8 irregular RC building–nonlinear layered soil–structure interaction system under dynamic wind-induced loading. A three-dimensional finite-element model of a G+8 irregular RC building was developed using ETABS software. The supporting soil was modelled as a multilayered nonlinear medium to capture variations in soil properties with depth and the associated nonlinear behaviour under dynamic wind forces realistically. The dynamic wind forces were evaluated in accordance with the relevant design standards. The interaction analysis incorporated the coupled effects of structural irregularity, soil nonlinearity, and layered soil conditions to assess their influence on displacement, acceleration, base shear, inter-storey drift, and foundation-pressure distribution. The findings reveal that soil nonlinearity significantly alters the dynamic characteristics of the building compared with conventional bare-frame analysis, leading to increased lateral displacements and modified natural frequencies. The layered soil strata further influence the distributions of stress and deformation and, consequently, the structural response of the interaction system.