Mechanism analysis of earthquake induced extreme motions: ping pong effect vs trampoline effect

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K12483
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Kyushu University
• Principal Investigator: Chen Guangqi 九州大学, 基幹教育院, 教授 (50293882)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 極端運動 / 急ブレークモデル / 卓球効果モデル / 多重加速モデル / メカニズム / 地震 / 斜面崩壊 / 土砂運動

Outline of Final Research Achievements

Extreme motions are often observed during strong earthquakes. They can be classified as the extreme large acceleration, the extreme large velocity and the extreme large displacement. Why and how these extreme motions occurred are still incomprehensible problems. It is important and necessary to clarify the mechanisms of these extreme motions induced by earthquakes for disaster mitigation in earthquake engineering as well as seismology. In this study, we have clarified the mechanism of each extreme motion phenomenon. A sudden braking model has been proposed for the mechanism of the extreme large acceleration. A ping pong model has been proposed for the mechanism of extreme large velocity. A Multiplex Acceleration Model has been proposed for extreme large displacement. The above mentioned extreme motions can be explained by using these models and they have been successfully simulated by using DDA simulations.

Free Research Field

防災工学、計算力学