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Title |
Identification of Failure Cause for Elastomeric Bearing in Bridge by Earthquakes
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Authors |
서영득(Young-Deuk Seo) ; 최형석(Hyoung-Suk Choi) ; 김인태(In-Tae Kim) ; 김정한(Jung Han Kim) ; 정영수(Young-Soo Jeong) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.6.19 |
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Abstract |
The seismic isolation system have been applied in order to protect the collapse of bridge by seismic load and the vertical load transmitted from the superstructure. However, the failure and damages of non-shrinkage mortar, isolator and wedge in total 12 bridge were reported by Pohang Earthquake. In this study, the damage mechanism and behavior characteristics of elastomeric bearing by an earthquake were evaluated to consider the seismic isolation system including non-shrinkage mortar and the seat concrete of pier. To discuss the effect of installed wedge and damage mode of elastomeric bearing, the compressive-shear tests were carried out. Also, the mechanical behaviors and damage mechanism for each component of elastomeric bearing were evaluated by using finite element analysis. From the test results, the cracks were created at boundary between non-shrinkage mortar and seismic isolator and the shear loads were rapidly increased after bump into wedge. The cause for damage mechanism of seismic isolation system was investigated by comparing stress distribution of anchor socket and non-shrinkage mortar depending on wedge during earthquake.
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