Data Assimilation for Fatigue Life Assessment of RC Bridge Decks Coupled with Path-Integral-Mechanistic Model and Non-Destructive Inspection
Yasushi Tanaka*1,†, Koichi Maekawa*2, Takuya Maeshima*3, Ichiro Iwaki*3, Takahiro Nishida*4, and Tomoki Shiotani*4
*1Institute of Industrial Science, The University of Tokyo
4-6-1, Komaba, Meguro-ku, Tokyo, Japan
*2The University of Tokyo, Tokyo, Japan
*3Nihon University, Fukushima, Japan
*4Kyoto University, Kyoto, Japan
Remaining fatigue life of reinforced concrete (RC) slabs subjected to traveling wheel-type loads is estimated by data assimilation procedure, i.e., coupled life-span simulation with inspection data. Multi-scale analysis (MSA) with path-integral-mechanistic models is used for the platform of data assimilation on which the visual inspection of concrete cracking on the members’ surfaces and the acoustic emission tomography (AET) are numerically integrated. For investigating the applicability of the proposed data assimilation, the wheel running experiments of RC slabs was conducted. Both crack patterns (2D) and 3D-AET were measured over the fatigue life till failure. In the pseudo-cracking assimilation, observed cracks are converted to space-averaged surface strains and the internal strain fields are simply assumed by in-plane hypothesis. This pseudo-cracking assimilation brings about fair assessment of the transient maximum deflection, but the residual deformation was found to be overestimated. Another non-destructive inspection data applied in this assimilation is the 3D-AET associated with the acoustic wave velocity, which has much to do with stiffness of some control volume with and without cracking. The AET velocity is converted to the initial fracture parameter of un-cracked concrete based on the elasto-plastic and fracture model used. Although cracking is not explicitly taken into account unlike the pseudo-cracking method, the small number of load repetition automatically generates internal cracks over the volume of analysis domains, and the remaining life of the slabs inspected was successfully estimated.
-  R. B. Peck, “Advantages and limitations of the observational method in applied soil mechanics,” Geotechnique, Vol.19, No.2, pp. 171-187. 1969.
-  K. Maekawa, A. Pimanmas, and H. Okamura, “Nonlinear mehcanics of reinforced concrete,” Spon Press, London, 2003.
-  K. Maekawa, T. Ishida, and T. Kishi, “Multi-scale modeling of structural concrete,” Taylor & Francis, London, 2009.
-  S. Koshimura, “Establishing the advanced disaster reduction management system by fusion of real-time disaster simulation and big data assimilation,” Journal of disaster research, Vol.11, No.2, pp. 164-174, 2016.
-  T. Maeshima, Y. Koda, S. Tsuchiya, and I. Iwaki, “Influence of corrosion of rebars caused by chloride induced deterioration on fatigue resistance in RC road deck,” J. JSCE E2, Vol.70, No.2, pp. 208-225, 2014.
-  A. Behnia, H. K. Chai, M. Yorikawa, S. Momoki, M. Terazawa, and T. Shiotani, “Integrated non-destructive assessment of concrete structures under flexure by acoustic emission and travel time tomography,” Const. Buid. Mat., 67B, pp. 202-215, 2014.
-  K. Maekawa and N. Fukuura, “Nonlinear modeling of 3D structural reinforced concrete and seismic performance (Chapter 11),” Infrastructure Systems for Nuclear Energy, John Wiley & Sons, 2014.
-  “Specifications for highway steel bridge,” Japan Road Association, 1964.
-  “Specifications for highway bridge, Part III Concrete bridges,” Japan Road Association, 2012.
-  S. Matsui, “Life time prediction of bridge,” J. JSSE, Japan, Vol.30, No.6, pp. 432-440, 1996.
-  Y. Kobayashi, K. Oda, and T. Shiotani, “Three dimensional AE tomography with accurate source location technique,” Proc. of Structural Faults & Repair 2014, 2014.
-  Y. Kobayashi and T. Shiotani, “Sesmic tomography with estimation of source location for concrete structures,” Proc. of Structural Faults & Repair 2012, 2012.
-  K. Maekawa, K. Toongoenthong, E. Gebreyouhannes, and T. Kishi, “Direct path-integral scheme for fatigue simulation of reinforced concrete in shear,” J. Advanced Concrete Technology, Vol.4, No.1, pp. 159-177, 2006.
-  C. Fujiyama, X. J. Tang, K. Maekawa, and X. An, “Pseudo-cracking approach to fatigue life assessment of RC bridge decks in service,” J. Advanced Concrete Technology, Vol.11, pp. 7-21, 2013.
-  M. Kado, T. Maeshima, Y. Koda, S. Nakano, C. Fujiyama and I. Iwaki, “Study on a method of evaluating fatigue damage for RC bridge deck slab using long basis optical strand sensors,” J. JSCE E2, Vol.71, No.4, pp. 323-337, 2015.