AVALIAÇÃO DO USO DE AMORTECEDORES DE MASSA SINTONIZADOS NA REDUÇÃO DE VIBRAÇÕES EM ESTRUTURAS SUBMETIDAS A CARGAS DINÂMICAS

Abstract

Advances in Civil Engineering, computational methods and materials science have provided increasingly slender, flexible structures with large spans and thus more susceptible to excessive vibration. Given this, given the need to ensure the good performance of the structure in service situations and avoid compromising the safety and integrity of buildings, it is necessary to look for alternatives to mitigate vibrations. Structural control is one of the alternatives to this problem and can be classified as passive, active, semi-active and hybrid. The passive system is characterized by having independent operation of any type of external energy and has been one of the most implemented techniques in Civil Engineering. The tuned mass damper (TMD) is a passive control device composed of one or more mass spring-damper systems tuned to the natural frequency of the structure to be controlled. The objective of this work is to evaluate the use of tuned mass dampers under various configurations - quantity and location - in the reduction of the dynamic response of a two, five and tem deck reinforced concrete flat structure subjected to seismic and harmonic excitations. The structure is modeled on shear building where each floor represents a degree of freedom and for the resolution of the equations of motion, in the time domain, a MATLAB computational routine based on the methodology described by Newmark was used. Initially, the structures were simulated with only its own damping, and later, based on the methods described by Den Hartog, Villaverde and Jangid, we obtained the parameters of the tuned mass dampers that were arranged in different ways: an TMD at the top, one TMD on each floor of the structure and two TMD in parallel at the top. The results were compared and it was verified that the structures presented a considerable reduction in their dynamic responses for the two types of loads used