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Kusaka A.,Kobori Research Complex Inc. | Ishida H.,Kobori Research Complex Inc. | Torisawa K.,Kajima Technical Research Institute | Doi H.,General Insurance Rating Organization of Japan | Yamada K.,General Insurance Rating Organization of Japan
AIJ Journal of Technology and Design | Year: 2015

Based on an earthquake insurance experience, the relationship between seismic ground motion intensity and the damage ratio of wooden houses is examined. In addition, vulnerability functions are evaluated from numerical simulations, in which houses are modeled with engineering judgment based on the experts' discussion as well as statistics of the insurance experience. The vulnerability functions have a ground motion intensity index as an explanatory variable, which are defined according to construction year and degree of loss to be covered in earthquake insurance, so as to reflect that ground motion frequency which is more correlated with damage ratio is different by structural characteristics of houses and degree of loss. Source

Watanabe T.,Kobori Research Complex Inc. | Nagano M.,Tokyo University of Science | Kato K.,Kobori Research Complex Inc.
Journal of Structural and Construction Engineering | Year: 2014

This paper investigates the influence of earthquake locations and an accretionary wedge in the Nankai Trough area on long-period ground motions in Tokyo using the 3D finite difference method. There is not much difference in ground motions in Tokyo when earthquake sources in the Japan Trench and the Nankai Trough are hypothetically assumed to be in the same conditions (e.g. moment, depth). Considering accretionary wedge in the Nankai Trough area, response is larger above accretionary wedge and smaller in Tokyo. It's suggested that the accretionary wedge is easy to trap seismic waves and doesn't necessarily enlarge response in distant Tokyo. Source

Okano H.,Kobori Research Complex Inc. | Sako Y.,Kobori Research Complex Inc.
AIJ Journal of Technology and Design | Year: 2013

A simple evaluation method for amplification of response spectrum by surface strata is proposed. The proposed method does not require any time history of design ground motion. That means the proposed method can be utilized in response and limit capacity calculation. In the proposed method, the response spectrum of design ground motion is converted to equivalent power spectrum density. The transfer function of surface strata is evaluated by one dimensional elastic wave propagation theory. The power spectrum density at ground surface is converted to response spectrum using peak factor. The good accuracy is achieved in evaluation of response spectrum amplification. Source

Watanabe T.,Kobori Research Complex Inc. | Kato K.,Kobori Research Complex Inc. | Tateishi H.,Tateishi Structural Design Inc
AIJ Journal of Technology and Design | Year: 2014

This paper describes applicability of a dynamic analysis model for Nikko-zan Rin-noji temple Hondo, the traditional wooden structure, based on observed records during the 2011 off the Pacific coast of Tohoku earthquake and its aftershocks. The 3-D frame model is configured on the basis of element experiments and empirical equations on earthquake resisting parts. The first natural frequency and the first damping factor of the model show relatively good agreement with those of the observed records, adding the hysteresis damping factor to the viscous damping factor even in small deformation. Source

Hatada T.,Kajima Technical Research Institute | Katamura R.,Kajima Technical Research Institute | Hagiwara H.,Kajima Technical Research Institute | Takahashi M.,Kobori Research Complex Inc. | And 2 more authors.
Journal of Structural and Construction Engineering | Year: 2013

This study presents the verification of damage evaluation method based on the measurement of Relative Story Displacements (RSDs). The damage evaluation method is formulated to detect the damaged locations of structural elements and evaluate their damage degree based on the displacement loading analysis by the time histories of measured RSDs. In the evaluation process, the analytical technique is introduced to compensate for the measurement errors associated with the sensor properties. The monitoring accuraciesare analyzed through the shaking table test of a full-scale 4-sotry steel building carried out at E-defense in Japan. The results indicate the effectiveness of the proposed damage evaluation method in its applications to the structural health monitoring system. Source

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