VIBRATION CONTROL OF GIRDER BRIDGE STRUCTURES THROUGH THE IMPLEMENTATION OF SUPERELASTIC SHAPE MEMORY ALLOY SPRINGS
FILIPE OLIVEIRA DAMASCENO1; Antônio Almeida Silva1; Armando Wilmans Nunes da Fonseca Júnior1
1 Universidade Federal de Campina Grande
doi:10.20906/CPS/CILAMCE2017-1266
Resumo
Every time the natural frequency of a machine or structure coincides with a vibration frequency of an external excitation, resonance appears and it can cause serious problems in civil constructions. Hence, it is important to control the latter. In this field the shape memory alloys (SMA) are gaining more and more usage due to its properties and ability to serve as a passive element of energy dissipation. This work has as an objective the vibration control in a girder bridge structure through the implementation of superelastic shape memory alloy springs. The mathematical model was based in a beam element fixed at one end and simply supported at the other with the springs attached to one point at the beam span. The experiments were realized with a shaker applying a transversal harmonic force at the bridge. It was noted that the damping ratio increased, causing a reduction of the vibration amplitude of the structure.
Palavras-chave: Vibration; Energy dissipation; Shape memory alloys; Girder Bridges; SMA