Mecanismos de controle dinâmico estrutural por meio de modelagem computacional de materiais viscoelásticos

Abstract

Structures located in regions with a high vulnerability to the occurrence of strong winds and severe earthquakes have history of records of material damages, loss of serviceability and partial or total loss of stability. Slender and flexible structures are, in general, susceptible to wind induced forces, while many types of structures can be affected by seismic action that in some cases may cause structural collapse. It is argued that the main causes of bad behavior and low level of structural stability result mainly from design faults which are related to the complexity and lack of clear understanding of the aerodynamic and seismic phenomena. These difficulties can be overcame with the use of dynamic control devices, specially developed in each case of study, for the reduction of the response amplitudes of structures subjected to the referred environmental actions. In this work, the solution for these problems is studied with the aid of numerical modeling of layered structures and damping mechanisms formed with multilayers of viscoelasctic and conventional materials The structural dynamic performance is demonstrated by comparing the response amplitudes of the controlled and uncontrolled systems, while the validation of the developed numerical tool is made through the correlation between results obtained from the numerical models and experimental tests for several example cases.