塑性流動抵抗型エラストマ・ダンパに関する研究(第1報, 小型モデルによる実験と設計式の開発)

In recent years, research and development of various dampers, which reduce the vibration by earthquakes and wind of the structures, have been prograssed. In this study, simple structural damper was suggested, which could aims at the development of the large-capacity damper. This damper uses unvulcanized rubber as working fluid, and obtains damping force by making plastic flow of rubber material in a vessel. In this paper, load tests were carried out to small model damper, and design formula was drawn. The design formula was theoretically obtained from the equation of the Navier-stokes. It has been applied by using the assumption of parameter of viscosity coefficient for the formula of the theoretical flow, in the flow of the unvulcanized rubber. By comparing the experimental results with design formula, it was proven that both agreed very well. Furthermore dynamic load tests were carried out for 98 kN damper which was designed by formula. As the results, the load-displacement characteristic of this damper was the rectangle shape that had the roundness, and it was confirmed that there is velocity dependence of the 0.2 nd power of the velocity on the damping force.