Development of Friction-Damping Vibration Control Device for Low-Rise Buildings

摘要

Damage to buildings in Japan during large earthquakes is seen mostly in low-rise buildings which tends to resonate with the earthquake ground motion. In this paper, a novel vibration control device that utilizes frictional forces is presented aimed towards appliction in low-rise buildings. Figure 1 shows a diagram of the installed damping device. The proposed ibration control device, as shown in the detailed drawing in Figure 2, has a structure in which contact with the beam occurs through the action of spring force alone, such that when the building is deformed in an earthquake, damping occurs through the action of frictional forces. In order to evaluate the device, vibration experiments were carried out on a miniature model, as shown in Figure 3. The investigation aimed to: 1) ascertain the appropriate rigidity for the parts on which the damping device is to be installed, 2) analyze the suitable spring tensions and frictional forces, and 3) evaluate the damping effects and construct a vibration model. The results confirmed that the vibration control device confers significant damping in the natural period range of low-rise buildings. In addition, in operation of the device, there is no obvious resonance point in the natural period range.