ASI-Gauss法による阿蘇大橋崩落プロセスの検証

Verification on Collapse Process of Aso Bridge during the 2016 Kumamoto Earthquake by ASI-Gauss Method

Abstract


 阿蘇大橋の崩落プロセスを解明し,その崩壊要因を特定することは,今後の山間部の橋梁の耐震設計の見直しの検討のために重要である.これまでにも,現地調査より崩壊要因の特定を試みられているが,崩壊自体の目撃情報はなく,また崩壊現象までを通常の有限要素法では再現することが困難なため,崩壊要因の特定までには至っていない.そこで本研究では,磯部らによって開発された骨組構造の動的崩壊解析で実績のあるASI-Gauss法を用い,阿蘇大橋の崩落プロセスの検証を実施した.


The 2016 Kumamoto Earthquake caused serious damages not only for private houses but also for infrastructures in Kumamoto prefecture. For example, a huge landslide happened after the earthquake and Aso Bridge, which was constructed in the same location of the landslide, totally collapsed. Since there is no observation data, it is difficult to get consensus on the main reason of Aso Bridge’s collapse. On the other hand, it is important in earthquake-resistant designing of bridges to investigate critical factors and failure processes. Therefore, in this paper, a numerical analysis of the Aso Bridge failure is conducted by ASI-Gauss method in order to verify the collapse process.


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