Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 09, 2018 - September 12, 2018
Many types of base isolation system have been proposed. Some of them are using friction characteristic. The authors have developed a base isolation system with friction for small size objects. Generally, seismic response of the system decreases with the increase of friction coefficient. However, it is observed that acceleration response increases with the increase of friction coefficient in some conditions. In order to examine this phenomenon, seismic response of the system with friction is calculated. The system is modeled as a single-degree-of-freedom system and seismic excitation is modeled as stationary filtered white noises. Using equivalent linearization method, standard deviation of the response is calculated. For displacement response, standard deviation of the response decreases with the increase of friction coefficient. For acceleration response, the standard deviation of the response takes minimum value when the natural period of the system is longer than the predominant frequency of excitation. Standard deviations of the responses are calculated for some natural period. Tendency of standard deviation of the response is same.
