- Volume 22 Issue 2
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Determination of equivalent elastic modulus of shotcrete-tetragonal lattice girder composite
사변형 격자지보재-숏크리트 합성부재의 등가물성 결정 기법
- Kang, Kyung-Nam (Dept. of Civil Engineering, Inha University) ;
- Song, Ki-Il (Dept. of Civil Engineering, Inha University) ;
- Kim, Sun Gil (Civil Infrastructure Research Division, Kolon Global Corporation) ;
- Kim, Kyoung Chul (Civil Infrastructure Research Division, Kolon Global Corporation)
- Received : 2020.01.14
- Accepted : 2020.03.20
- Published : 2020.03.31
Steel set is a structure that stabilize the NATM tunnel until the installation of shotcrete, and it is combined after the shotcrete is installed to improve stability. In this study, determination approach for the equivalent elastic modulus of shotcrete-lattice girder composite is newly suggested for tunneling simulation. Also, a method was presented to calibrate the equivalent elastic modulus through the comparison of the full 3D model and equivalent model. When the conventional equivalent elastic modulus is used for shotcrete-lattice girder composite, the flexural strength of equivalent model is 130% smaller than that of full 3D model. Equivalent elastic modulus is adjusted considering the error of flexural strength. It is found that the error of flexural strength obtained from adjusted equivalent model using adjusted equivalent elastic modulus is reduced less than 1%.
Supported by : 한국연구재단
- ACI Committee 318 (1999), Building code requirements for reinforced concrete (ACI318-99), American Concrete Institute.
- Ha, T.W., Kim, D.Y., Shin, Y.W., Yang, H.S. (2008), "Evaluation methods of shotcrete lining stresses considering steel rib capacities by two-dimensional numerical analysis", Journal of Korean Tunnelling and Underground Space Association, Vol. 10, No. 3, pp. 269-282.
- Jung, H.S., Shin, Y.W., Song, K.I., Shin, J.H. (2016), "Performance evaluation of lattice girder depending on the quality of steel", Journal of Korean Tunnelling and Underground Space Association, Vol. 18, No. 2, pp. 165-173. https://doi.org/10.9711/KTAJ.2016.18.2.165
- KICT (1996), Application of lattice girders in tunneling, Korea Institute of Civil Engineering and Building Technology.
- Kim, D.G., Bae, G.J. (2008), "Development of a laboratory testing method for evaluating the loading capability of lattice girder", Journal of Korean Tunnelling and Underground Space Association, Vol. 10, No. 4, pp. 371-382.
- Kim, D.G., Bae, G.J., Kim, D.R., Choi, Y.H. (2007), "Loading capacity of lattice girders in material property", Proceedings of the KSCE 2007 Civil Expo Korean Society of Civil Engineers, Daegu, pp. 1076-1079.
- Kim, D.G., Lee, S.H., Choi, Y.N. (2008), "Evaluation of loading capacity of lattice girder according to laboratory testing method", Proceedings of the Korean Geo-Environmental Society, Seoul, pp. 399-406.
- Kim, D.G., Lee, S.H., Kim, N.Y. (2009), "Status and capacity of lattice girder", Proceedings of the Korean Geo-Environmental Society, Seoul, pp. 374-380.
- Kim, H.J., Song, K.I., Jung, H.S., Shin, Y.W., Shin, J.H. (2018), "Performance evaluation of lattice girder and significance of quality control", Tunnelling and Underground Space Technology, Vol. 82, pp. 482-492. https://doi.org/10.1016/j.tust.2018.08.058
- Kim, S.J., Han, T.H., Baek, J.S., Kang, Y.J. (2013), "Evaluation of the structural performance of tetragonal lattice girders", International Journal of Steel Structures, Vol. 13, No. 1, pp. 31-47. https://doi.org/10.1007/s13296-013-1004-y
- KS F 2408 (2016), Standard test method for flexural strength of concrete, National Institute of Technology and Standards, Korea.
- MOLIT (2011), The revision of the road-design guideline (the chapter of tunnel), Ministry of Land, Transport and Maritime Affairs.
- Moon, H.D., Paik, Y.S., Bae, G.J. (1997), "An experimental study on the characteristics of a composite structure of lattice girder and shotcrete", Geotechnical Engieering, Vol. 13, No. 2, pp. 155-168.
- Raphael, J.M. (1984), "Tensile strength of concrete", ACI Journal, Vol. 81, No. 2, pp. 158-165.
- Yoo, C.S., Kim, Y.J., Bae, G.J., Moon, H.D. (1997), "An experimental study on load bearing capacity of lattice girder as a steel support in tunnelling", Journal of the Korean Geotechnical Society, Vol. 13, No. 4, pp. 163-175.