Seismic Soil-Structure Response of Plan Irregular Building on Piled Raft Foundation

The effect of soil-structure interaction refers to the behavior of the soil medium supporting the structure when various loads are acting on the structure. If the design response spectrum and ground motion sufficiently account for the kinematic effect of the foundation and its effect on the on-site reaction, omitting the soil-structure interaction (SSI) effect is frequently conservative. To lower the risk, a soil structure study is desirable. The structures impact soil qualities for example pile foundation in soft soil. A building has a pile foundation or a deep foundation that makes it challenging to detect ground motion. The site conditions are vulnerable to large ground motions, fault planes, or soil liquefaction. The present research work focuses on the seismic and wind analysis of symmetrical and unsymmetrical multistorey buildings, i.e., G + 15 bare frame for the following cases, case-1 without SSI, case-2 with SSI. For case-2, the analysis is done by considering the soil in 2-layers and 3-layers, which consists of soft soil (Vs < 600 ft/s), stiff soil (600 ≤ Vs ≤ 1200 ft/s), and soft rock (1200 < Vs ≤ 2500 ft/s) according to IBC site classifications. The structure’s response at different floor levels in terms of displacement and mode shape with time period is obtained for earthquake and wind loads using SAP 2000 based on the Finite Element Method (FEM). From the study, 3-layered soil model gives lowest displacements compared to 2-layered soil models.