Calculating the Dynamic Impedances of Foundations and their Effect on the Seismic Response of Structures: Analytical and Numerical Study

• Main Authors: Boulkhiout Radhwane, Messast Salah
• Format: Article
• Language: English
• Published: Sciendo 2021-06-01
• Series: Civil and Environmental Engineering Reports
• Subjects: soil-structure interaction; finite element method; substructure method; impedance functions; conan; equivalent static method; soil densification
• Online Access: https://doi.org/10.2478/ceer-2021-0026

This study evaluates the movement of a frame built on soft soil under seismic excitation taking into account soil-structure interaction. First, the study was evaluated using the finite element method, then, by using a substructure method which modelled the soil using springs and dampers in a linear and nonlinear study. Rheological models were determined using impedance functions, calculated using a numerical program CONAN. These dynamic impedances are shown in the displacement vector of a three-degrees-of-freedom frame, which was calculated on the basis of lateral forces distributed over the structure height using the equivalent static method. In this regard, two different calculation norms were chosen; RPA2003 and UBC97. Finally, a parametric study was carried out, based on the effects of soil densification and the foundation geometry on the response of the RC frame.