A Study on Vibration Performances of Japanese Traditional Timber Buildings Based on Microtremor Measurements

Abstract eng:
It aims at expressing the vibration performances of the Japanese traditional timber building based on the microtremor measurements. There are many traditional timber dwelling houses in Japan. These houses has a frontage of about 3 - 5 m and with a length of about 15 m. Therefore, these houses are more soft stiffness than the common new houses of which the natural frequencies are about 6.0 Hz. These houses have lower seismic performances than new one. The residents and the local governments need to grasp the vibration performances of the Japanese traditional timber building and to retrofit these houses for leaving to posterity. Our research group conducted the field survey with a microtremor measurement for Japanese traditional timber dwelling houses on a part of the Tokai district. The district is afraid of a damage by an expected the Tokai earthquake or the To-Nankai earthquake. We are selected some area which have cooperate with us to survey. These area have many traditional buildings built about a hundred years ago. A natural frequencies of these houses are about 3 - 4 Hz. And we recommend retrofitting these houses. And our research group executed a microtremor measurement for a seismic retrofitting of the Japanese traditional timber dwelling houses. As a result of these investigation and it was grasped that the natural frequency after seismic retrofit construction was higher than before. For example and the natural frequency 3.22 Hz become 4.68 Hz after seismic retrofit construction. And we were able to propose effective seismic retrofit based on a microtremor measurement of the timber structure.

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