Damage Evolution of Underground Structural Reinforced Concrete Small-Scale Static-Loading Experiments

Authors: Ahmed Mohammed Youssef Mohammed, Mohammad Reza Okhovat, Koichi Maekawa

Abstract:

Small-scale RC models of both piles and tunnel ducts were produced as mockups of reality and loaded under soil confinement conditionsto investigate the damage evolution of structural RC interacting with soil. Experimental verifications usinga 3D nonlinear FE analysis program called COM3D, which was developed at the University of Tokyo, are introduced. This analysis has been used in practice for seismic performance assessment of underground ducts and in-ground LNG storage tanks in consideration of soil-structure interactionunder static and dynamic loading. Varying modes of failure of RCpilessubjected to different magnitudes of soil confinement were successfully reproduced in the proposed small-scale experiments and numerically simulated as well. Analytical simulation was applied to RC tunnel mockups under a wide variety of depth and soil confinement conditions, and reasonable matching was confirmed.

Keywords: Soil-Structure Interaction, RC pile, RC Tunnel

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1078277

References:

[1] Hamada, M.(1992). "Large ground deformations and their effects on lifelines: 1964Niigata earthquake. Case studies of liquefaction and lifelines performance during past earthquakes," Technical Report NCEER-92-0001, Volume 1, Japanese Case Studies, National Centre for Earthquake Engineering Research. Buffalo, NY.
[2] EERI (2010). "The Mw 7.0 Haiti Earthquake of January 12, 2010," Report 1, Special Earthquake Report, Earthquake Engineering Research Institute.
[3] Wilson, D. W. (1998) "Soil-pile-superstructure interaction in liquefying sand and soft clay," PhD thesis, University of California, Davis, CA.
[4] Towhata, I. (2008). "Geotechnical Earthquake Engineering," Springer, Germany.
[5] Maekawa, K., Pimanmas, A. and Okamura, H. (2003). "Nonlinear Mechanics of Reinforced Concrete," Spon Press, London.
[6] Maki, T., Maekawa, K., and Mutsuyoshi, H. (2005). "RC pile-soil interaction analysis using a 3D-finite element method with fiber theory-based beam elements," Earthquake Engineering and Structural Dynamics, 99, 1-26.
[7] Tuladhar, R., Maki, T., and Mutsuyoshi, H. (2008). "Cyclic behavior of laterally loaded concrete piles embedded into cohesive soil," Earthquake Engineering and Structural Dynamics, 37, 43-59.
[8] Okhovat, M. R., and Maekawa, K.(2009) " Damage control of underground RC structures subjected to service and seismic loads," PhD thesis, University of Tokyo.
[9] Kato, B. (1979). "Mechanical properties of steel under load cycles idealizing seismic action," CEB Bulletin D-Information, 131, 7-27.
[10] Towhata, I. and Ishihara, K. (1985) "Modeling soil behaviors under principal stress axes rotation," 5th Int. Conf. on Numerical Method in Geomechanics, Nagoya, 523-30.
[11] Masing, G.(1926 )"Eigenspannungen and VerfestigungBeim Messing," Proc. of Second International Congress of Applied Mechanics, 332, Zurich.
[12] Konagai, K., Yin, Y., and Murono, Y. (2003) "Single beam analogy for describing soil-pile group interaction," Soil Dynamics and Earthquake Engineering, 23, 213-221.
[13] Maekawa, K. and An, X. (2000). "Shear failure and ductility of RC columns after yielding of main reinforcement," Engineering Fracture Mechanics, 65, 335-368.
[14] Li, B., Maekawa, K. and Okamura, H. (1989). "Contact density model for stress transfer across crack in concrete," Journal of Faculty of Engineering, University of Tokyo (B), 40(1), 9-52.
[15] Nam, S. H., Songa, H. W., Byuna, K. J., Maekawa, K. (2006)" Seismic analysis of undergroundreinforced concrete structures consideringelasto-plastic interface element with thickness,"Engineering Structures, 28, 1122-1131.