Title:
Numerical Simulation of AFRP Rod NSM RC Beams under Falling-weight Impact Loading
Author(s):
Masato Komuro, Yusuke Kurihashi, Tomoki Kawarai and Norimitsu Kishi
Publication:
Symposium Paper
Volume:
327
Issue:
Appears on pages(s):
17.1-17.14
Keywords:
RC beam; impact load; strengthening method, FRP rod; near-surface mounting (NSM) method, FE analysis; equivalent tensile fracture energy
DOI:
10.14359/51713338
Date:
11/1/2018
Abstract:
In order to establish a numerical analysis method to provide an improved estimate of the dynamic response characteristics of reinforced concrete (RC) beams strengthened with near-surface mounted (NSM) Aramid FRP (AFRP) rods under impact loading, a method using fictitious tensile strength of the concrete elements based on an equivalent tensile fracture energy concept (Gf) was proposed. Applying this concept for the concrete elements, an elasto-plastic dynamic response analysis of the RC beams under impact loading was carried out using a fine mesh for a more accurate evaluation of the crack patterns and for a more realistic consideration of the strengthening effects of AFRP rods. The applicability of the method was investigated comparing with the experimental results. Here, configurations of the time histories of the impact force, the reaction force, the mid-span deflection, and crack patterns occurred in the RC beams were used for this investigation. From this study, it was seen that the RC beams strengthened with NSM AFRP rods under falling-weight impact loading can be better simulated using fine meshes with fictitious tensile strength for concrete elements following proposed Gf concept. Here, the case of using a fine mesh having a length of about 6 mm gave appropriate results.
Related References:
1. Norris, T., Saadatmanesh, H. and Ehsani, M.R., 1997, “Shear and flexural strengthening of R/C beams with carbon fiber sheets”, Journal of Structural Engineering, ASCE, 23(7), 903-911.
2. Nanni, A, Ludovico, M.D., and Parretti, R., 2004, “Shear strengthening of a PC bridge girder with NSM CFRP rectangular bars”, Advances in Structural Engineering, 7, 97-109.
3. El-Hacha, R, and Rizkalla, S.H., 2004, “Near-surface-mounted fiber-reinforced polymer reinforcements for flexural strengthening of concrete structures”, ACI Structural Journal, 101(5), 717-726.
4. Dai, J.G., Ueda, T., Sato, Y. and Ito, T., 2005, “Flexural strengthening of RC beams using externally bonded FRP sheets through flexible adhesive bonding”, Proceedings of the International Symposium on Bond Behaviour of FRP in Structures, December 7-9, Hong Kong, China, 205-213.
5. Barros, J.A.O., Dias, S.J.E. and Lima, J.L.T., 2007, “Efficacy of CFRP-based techniques for the flexural and shear strengthening of concrete beams”, Cement and Concrete Composites, 29(3), 203-217.
6. Barris, C., Torres, Ll., Turon, A., Baena, M., and Catalan, A., 2009, “An experimental study of the flexural behaviour of GFRP RC beams and comparison with prediction models”, Composite Structures, 91(3), 286-295.
7. Mikami, H., Kishi, N., and Kurihashi, Y., 2000, “Flexural bonding property of FRP sheet adhered to RC beams”, Proceedings of Congress of IABSE, Lucerne, Switzerland, Sept.18-21, 380-381.
8. Kishi, N., Mikami, H., Matsuoka, K.G., and Kurihashi, Y., 2001, “Failure behavior of flexural strengthened RC beams with AFRP sheet”, Proceedings of FRPRCS-5, Cambridge, England, July 16-18, 87-95.
9. Sawada, S., Kishi, N., Mikami, H., and Kurihashi, Y., 2003, “An experimental study on debond-control of AFRPs for flexurally strengthened RC beams”, Proceedings of FRPRCS-6, Singapore, July 8-10, 287-296.
10. Kishi, N., Mikami, H., Kurihashi, Y., and Sawada, S., 2005, “Flexural behavior of RC beams reinforced with NSM AFRP rods”, Proceedings of the International Symposium on Bond Behaviour of FRP in Structures, December 7-9, Hong Kong, China, 337-342.
11. Kurihashi, Y., Kishi, N., and Mikami, H., 2009, “Iterative loading test with constant amplitude for flexural reinforced RC beams with FRP sheet”, Proceedings of FRPRCS-9, Sydney, Australia, July 13-15, CD-ROM.
12. Kishi, N., Zhang, G.F., and Mikami, H., 2005, “Numerical cracking and debonding analysis of RC beams reinforced with FRP sheet”, Journal of Composites for Construction, ASCE, 9(6), 507-514.
13. International Federation for Structural Concrete (fib)., 2001, “Externally bonded FRP reinforcement for RC structures”, Bulletin 14.
14. Concrete Society., 2012, “TR55 Design guidance for strengthening concrete structures using fibre composite materials”
15. American Concrete Institute., 2017, “440.2R-17: Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures”
16. Aslam, M., Shafigh, P., Jumaat, M.Z., Shah, S.N.R., 2015, “Strengthening of RC beams using prestressed fiber reinforced polymers – A review”, Construction and Building Materials, 82, 235-256.
17. Pham, T.M. and Hao, H., 2016, “Review of concrete structures strengthened with FRP against impact loading”, Structures, 7, 59-70.
18. Kishi, N., Komuro, M., Kurihashi, Y., and Mikami, H., 2017, “Upgrading effects of near-surface mounting of Aramid fiber reinforced polymer rods on impact resistant capacity of reinforced concrete beams”, 6th Interdisciplinary Workshop on Rockfall Protection, May 22-24, Barcelona, Spain, 149-152.
19. Kishi, N., Komuro, M., Kurihashi, Y., Mikami, H., and Funaki, T., 2017, “Experimental study on upgrading of impact resistant capacity for RC beams strengthened with NSM-AFRP rods”, Journal of Structural Engineering, JSCE, 63A, 1188-1200. (in Japanese)
20. Kishi, N. and Bhatti, A.Q., 2010, “An equivalent fracture energy concept for nonlinear dynamic response analysis of prototype RC girders subjected to falling-weight impact loading”, International Journal of Impact Engineering, 37, 103-113.
21. Hallquist, J.O., 2015, “LS-DYNA Version R8 User’s Manual”, Livermore Software Technology Corporation.
22. Kishi, N., Khasraghy, S.G., and Kon-no, H., 2011, “Numerical simulation of reinforced concrete beams under consecutive impact loading”, ACI Structural Journal, 108(4), 444-452.