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Title |
Fatigue Durability Evaluation of Refraction Expansion Joints
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Authors |
나준수(Jun-Su Na) ; 이타(Ta Lee) ; 한의석(Eui-Seok Han) ; 성원규(Won-Kyu Sung) ; 이종석(Jong-Suk Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.6.010 |
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Keywords |
신축이음장치 ; 굴절형 ; 저소음 ; 피로내구성 ; 볼트 Expansion Joints ; Refraction ; Low Noise ; Bolt |
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Abstract |
The refraction expansion joints have been newly developed by complementing the problems of shock, noise, replaceability, displacement in the direction perpendicular to bridge, vertical difference, which are problems of existing expansion joints. The Refraction expansion joints are characterized by continuous surfaces with small impact and low noise. The behavior of the Refraction expansion joints performs the bridge expansion behavior by rotation of the link. In the rotational behavior of the link, the bolt is the central axis of the behavior. Therefore, it can be said that the durability of the bolt is very important. However, the theoretical and experimental verification of the bolt durability of the Refraction expansion joint is lacking. In this paper, to verify the fatigue durability of the bolt, test specimens with a 300 mm Refraction expansion joint were fabricated. A strain gauge dedicated to the bolt was installed inside the manufactured test specimen bolt. The test method was applied in accordance with KS F 4425. The fatigue durability of the bolts assembled inside the diaphragm expansion joint was confirmed by the repeated fatigue test of 2,000,000 cycles.
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