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Title |
The Experimental Study of the Ultimate Behavior of an Avalanche Tunnel Corner Rigid Joint Composited with a Centrifugal Formed Beam
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Authors |
이두성(Doo-Sung Lee) ; 김성진(Sung-Jin Kim) ; 김정회(Jeong-Hoi Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.6.128 |
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Keywords |
우각부; 피암터널; 원심성형; 재하시험; 초고강도 Corner rigid joint; Avalnche tunnel; Centrifugal molding; Static loading test; Ultra high strength |
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Abstract |
In this study, in order to apply ultra-high-strength concrete beams of 100 MPa or more manufactured by centrifugal molding as thesuperstructure of the avalanche tunnel, the purpose is to verify the structural safety of the corner rigid joint in which the centrifugal molded beam isintegrated with the substructure, which is the negative moment area. A full-size specimen was manufactured, and loading tests and analysis studieswere performed. In order to expect the same effect that the maximum moment occurs in the corner joint part of the upper slab end when the standardmodel of the avalanche tunnel is designed with a load combination according to the specification, a modified cantilever type structural model specimenwas manufactured and the corner rigid joint was fixedly connected. A study was performed to determine the performance of the method and the optimalconnection construction method. The test results demonstrated that the proposed connection system outperforms others. Despite having differencesin joint connection construction type, stable flexural behavior was shown in all the tested specimens. The proposed method also outperformed thebehavior of centrifugally formed beams and upper slabs. The behavior of the corner rigid joint analysis model according to the F.E. analysis showedslightly greater stiffness compared to the results of the experiment, but the overall behavior was almost similar. Therefore, there is no structural problemin the construction of the corner rigid joint between the centrifugally formed beam and the wall developed in this study.
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