Abstract
This paper deals with an isolation device by using friction force. An isolation device decreases response acceleration and external force. Therefore, earthquake damage is reduced. However, an isolation device has a demerit for large relative displacement. The purpose of this research is to decrease the relative displacement by using the friction force. Then, an analytical model in consideration of the friction force is proposed, and a simulation is analyzed with well-known earthquake waves. Consequently, it is thought that optimal friction force exists, and this force decreases both the response acceleration and the relative displacement. This is considered to change with the properties of earthquake waves. Then, the model to which friction power is changed in linear was proposed from the relation with the compression spring attached in the lower part by changing the angle of a friction surface. An experimental device is made under the same conditions as the proposed analytical model. The experimental results are compared with the analytical results.
