Estudo comparativo entre modelos de representação de fluido para o uso de caixas d’água como amortecedores de líquido sintonizados

Abstract

The current urban agglomeration of the cities and the civil construction demand has led to the necessity of the construction of slender buildings, which are subjected to the action of horizontal dynamic forces, such as seismic motion and the wind. The focus of the present work is to evaluate if a water supply tank located at the top of the building can work as a Tuned Liquid Damper (TLD), besides assessing the effect of its eccentricity. A four-story building with commercial use subjected to seismic is studied in this work. In order to verify the potential damping effect of the reservoir, the water is modeled associating the models proposed by Housner (1963) and Yu et al. (1999). An analytical analysis is performed in the software Octave, while SAP2000 v14 (CSI, 2009) is used for a numerical finite element analysis. Results show that the water inside the reservoir can help reduce the displacements of the building, but not enough for acceptable levels when the seismic load used is applied on the structure. Furthermore, the eccentric position of the water tank developed vibrations which almost did not exist when the reservoir was at the center, like the displacement in the other direction and torsion of the building.