Análise da influência de diferentes configurações de instalação de amortecedores de massa sobre um pórtico de estrutura metálica submetido à cargas dinâmicas

Abstract

This work presents a comparative study about the use of tuned mass dampers (TMD), in different installation settings, for the control of a steel frame, subjected to different types of dynamic excitations, which are a recent earthquake and an ambient excitation modeled as a white noise. For this study, a computational routine was used in the MATLAB software, applying dynamic structural calculation methods combined with the Newmark method, to solve the structure equations of motion. A comparison of the modeled frame with several floor numbers has been made, and for each of these, different arrangements of the tuned mass dampers have been tested, namely: a damper on the top of the structure; multiple dampers installed on alternate floors; and two interconnected dampers on the top. Thus, differences in displacement, velocity, and damping results have been analyzed for each case, and compared with the structure without any damper installed, checking for each of the two dynamic excitations which configuration would further reduce its response.