Eventos Anais de eventos
MECSOL 2022
8th International Symposium on Solid Mechanics
A time-domain IBEM-FEM model of the ground vibration attenuation function of surface walls.
Submission Author:
Leonardo Antoniazzi Marques , SP , Brazil
Co-Authors:
Leonardo Antoniazzi Marques, Josue Labaki
Presenter: Leonardo Antoniazzi Marques
doi://10.26678/ABCM.MECSOL2022.MSL22-0002
Abstract
This article presents a study on the ground vibration attenuation performance of surface walls. The analyses consider ground vibration resulting from arbitrary transient sources applied at the soil surface. A coupled IBEM-FEM model is used for the study, in which surface walls are modeled via classical finite elements, and the response of the soil is modeled via superposition of soil influence functions, within an Indirect Boundary Element Method (IBEM) framework. Coupling between the two subsystems is obtained by imposing continuity and equilibrium conditions at the soil-wall interface. The dynamic response of the coupled system is derived in the frequency domain, in which the coupled equations of motion can be solved algebraically. Transient responses to impulse loading are obtained from these by direct application of Fast Fourier Transforms (FFT). Transient responses to arbitrary loading are obtained via the convolution of those to impulse loading with the arbitrary transient loading of interest. The paper discusses robust numerical integration schemes to obtain soil influence functions for very high frequencies. Although high-frequency solutions are typically of little interest in soil-structure interaction analysis, they are required for transient solutions obtained via FFT to be detailed enough. The article also discusses strategies to alleviate the high computational cost of such model. Selected numerical results for various constitutive parameters are presented, and show that surface walls can be an effective measure against ground vibration, and that their properties can be selected to yield optimal attenuation performances.
Keywords
Soil-Structure Interaction, Vibration Attenuation, Transient analysis
