Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
TRANSIENT RESPONSE OF SOIL-FOUNDATION SYSTEMS BY UPDATED STRUCTURAL MODAL QUANTITIES
Submission Author:
EUCLIDES MESQUITA , SP , Brazil
Co-Authors:
Amauri Coelho Ferraz, EUCLIDES MESQUITA, Luis Filipe do Vale Lima, Josue Labaki
Presenter: Amauri Coelho Ferraz
doi://10.26678/ABCM.COBEM2021.COB2021-1029
Abstract
Soil behavior has a large influence on the dynamic response of the structural or mechanical systems. The dynamic modelling of unbounded domains, such as the soil, requires special techniques. In the last decades the Boundary Element Method (BEM) has established itself as a mature and efficient numerical tool to analyze response of unbounded domains. The response of systems interacting with the soil usually requires a sub-domain division, in which the soil is modelled by the BEM and the Structure by the FEM. In the present work, the stationary response of the structure is obtained by classical modal analysis procedures. This response, that may be obtained for an arbitrary number of modes, is coupled to the stationary response of the soil-foundation arrangement. This leads to modified frequency response functions (FRFs) of the structure, in which the soil-foundation influence is already taken into account. Based on these modified FRFs, new modal parameters of the coupled soil-foundation-structure system are extracted. These modal quantities are the base to determine the transient response of the coupled systems. This methodology is computationally more efficient than the interactive transient coupling of the soil and the structural system or the synthesis of the coupled system in the frequency domain followed by the application of the FFT algorithm to render the transient response.
Keywords
Dynamic Soil Structure Interaction, Boundary Element Method, Transient Response, modal analysis
