Study, design and construction of a tuned mass damper (TMD) For concrete building floors

摘要

Tuned mass dampers (TMDs) are control devices consisting of a mass-spring-dashpot system connected to the structure in a way to vibrate out of phase with the main structure, if tuned to the appropriated frequency. In this way the energy is transferred to the TMD reducing amplitude vibration on the main system. The use of TMD to reduce floor vibration has been studied by many researchers lately, however there are still many topics to further development. Through preliminary numerical analysis this work aims to design a TMD to be installed on a platform for dynamic tests located in the University of Brasilia Structure Lab. This platform behaves like reinforced concrete buildings floors subjected to conventional human activity that can cause critical excessive vibrations. Reducing vibration amplitudes using TMD improve human comfort and guarantee structural safety. Numerical modeling of the structure with TMD installed is performed using the finite element ANSYS computational package. The modal analysis of the platform defines natural frequencies and vibration modes, this information allows tuning the TMD properly. The TMD design is based in the study of different parameters such as geometry, material, amount of mass, TMD positioning and the number of devices needed. This study will contribute to vibration control of building floors.