Fundamental Research about Vibration of Stone Lantern (Ishi-toro) by Earthquake

Abstract eng:
Stone lantern (Ishi-toro) was imported into Japan concurrently with Buddhism and mostly made with construction of the temple. Moreover, the fall and destruction of the stone lantern by an earthquake have been reported by the ancient documents of our country, and those examples become one index of expressing the grade of a shake of the past earthquake. However, the stone lantern designated as a cultural property needs to prevent the fall and destruction by an earthquake, and needs to make the minimum damage to the person at the time of a fall. In this report, it is introduced that the example of damage of the stone lantern by big earthquakes, such as the Great East Japan Earthquake in 2011. Then, the excitation experiment using the reduction model of the stone lantern is conducted, and the result of having worked on the grasp and measure against the earthquake performance of a stone lantern is reported. The damage of the stone lantern in the Great East Japan Earthquake was found even in Tokyo away from the epicenter. From the example, it was found that dry masonry had fallen mostly and the direction where each component was in general the same, the tendency for the direction to shift in a more nearly upper component. Based on these examples, the excitation experiment was conducted using the model made from granite reduced about 40 percent from the usual stone lantern. It was confirmed that dry masonry changed resonance frequency according to the amplitude of uniaxial vibration table. Moreover, in the collapse experiment using JMA Kobe NS wave, dry masonry collapsed with 4 % of 50 % of a time-axis and amplitude, and mortar junction prevented collapse to one 4 times the amplitude of this compared with dry masonry. Furthermore, the specimen of the core stick and the vibrational absorption plastic gel sheet did not collapse.

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