EVALUATION OF STRUCTURAL PERFORMANCE OF EXISTING TRADITIONAL TIMBER STRUCTURES IN JAPAN BY MICROTREMOR MEASUREMENTS

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The structural integrity of the existing traditional timber structures (for instance, temples, shrines and folk dwellings) in Japan is maintained by the periodic maintenance. The evaluation of the structural performance is important to determine the necessity of repairing and maintenance. The microtremor measurement method is a simple nondestructive inspection method used to evaluate the fundamental vibration characteristics of structures. Therefore, this method is expected to play an effective role in the structural evaluation of the existing traditional timber structures. In this research, several existing traditional timber structures that differ in construction type, year of construction and building configuration are categorized into a construction type. The results of the microtremor measurements are evaluated for each category. The relationship between the natural frequency of structures obtained by the results of microtremor measurement and the maximum strength of structure calculated by structure analysis was discussed in this research. In future research, a method of seismic diagnosis by the application of microtremor measurement should be clarified.