Issue 29

R. Serpieri et alii, Frattura ed Integrità Strutturale, 29 (2014) 284-292; DOI: 10.3221/IGF-ESIS.29.24 292 The remaining small discrepancies between the numerical and experimental results obtained in the presented validation can be partly attributed to the need of including some adherence between steel and concrete in correspondence of the clay sleeve. On the other hand, these can also be due to some aspects of the underlying physics that have not yet been included in the model, namely the finite size of the asperities in the RIA at the microscale, their deformation, wear, damage and failure and a more representative statistical distribution of their dimensions and geometry. These aspects will be investigated in the continuation of this research. R EFERENCES [1] Del Piero, G., Raous, M., A unified model for adhesive interfaces with damage, viscosity and friction, Eur J. Mech. A/Solids. 29 (2010) 496-507. [2] Cocchetti, G., Maier, G., Shen., X.P., Piecewise linear models for interfaces and mixed mode cohesive cracks, Comp Model. Eng. Sci., 3(2002) 279–298. [3] Bolzon, G., Cocchetti, G., Direct assessment of structural resistance against pressurized fracture, Int. J. Num. Anal. Meth. Geomech., 27 (2003) 353–378. [4] Červenka, J., Chandra Kishen, J.M., Saouma, V.E., Mixed mode fracture of cementitious bimaterial interfaces; part II: numerical simulation, Eng. Frac. Mech. 60 (1998) 95–107. [5] Giambanco, G., Rizzo, S., Spallino, R., Numerical analysis of masonry structures via interface models, Comp. Meth. Appl. Mech. Eng., 190 (2001) 6493–6511. [6] Alfano, G., Sacco, E., Combining interface damage and friction in a cohesive-zone model, Int. J. Num. Meth. Eng., 68 (2006) 542-582. [7] Alfano, G. Marfia, S., Sacco, E., A cohesive damage-friction interface model accounting for water pressure on crack propagation, Comp. Meth. Appl. Mech. Eng., 196 (2006) 192-209. [8] Sacco, E., Toti, J., Interface elements for the analysis of masonry structures, Int. J. Comp. Meth. Eng. Sci. Mech, 11 (2010) 354-373. [9] Serpieri, R., Alfano, G., Bond-slip analysis via a thermodynamically consistent interface model combining interlocking, damage and friction, Int. J. Num. Meth. Eng. 85 (2011) 164-186. [10] Serpieri, R., Sacco, E., Alfano, G., A thermodinamically consistent derivation of a frictional-damage cohesive-zone model with different mode I and mode II fracture energies, Submitted to Eur J. Mech. A/Solids. [11] Federation Internationale du Bèton (FIB), Bond of reinforcement in concrete, Bulletin No. 10, state of Art Report T.G. 4/2 Bond Models, FIB, Lausanne, Switzerland, (2000). [12] Tassios, T.P., Properties of bond between concrete and steel under load cycles idealizing seismic actions, in Proc. AICAP-CEB Symposium, Rome, CEB, Bulletin d’Information 131 (1979) 67-122. [13] Tassios, T.P., Koroneos, E.G., Local bond-slip by means of the moiré method, ACI Struct. J., 81 (1984) 27-34. [14] Gambarova, P.G., Rosati, G.P., Bond and splitting bar in pull-out: behaviour laws and concrete cover role, Magaz. Concr. Res., 49 (1997) 99–110. [15] Goto, Y., Cracks formed in concrete around deformed tension bars. ACI Journal, Proceedings, 68 (4) (1971) 501. [16] Tepfers, R., Cracking of concrete cover along anchored deformed reinforcing bars, Magaz. Concr. Research, 31(106) (1979) 3-12. [17] Rehm, G., The basic principles of the bond between steel and concrete., Transl. 134 Cement Concr. Association, London, (1968). [18] Shima, H., Chou, L.L., Okamura, H. Micro and Macro Models for Bond Reinforced Concrete, Reprinted from Journal of the faculty of Engineering, the University of Tokio, 39, (1987). [19] Geers, M.G.D., Kouznetsova, V.G., Brekelmans, W.A.M., Multi-scale computational homogenization: trends and challenges, J. Comp. Appl. Math., 234 (2010) 2175-2182. [20] Carpinteri, A., Valente, S., Ferrara, G., Melchiorri, G., Is mode II fracture energy a real material property?. Comp. Struct. 48 (1993), 397-413. [21] NTC2008 - Nuove Norme Tecniche per le Costruzioni G. U. n. 29, 04.02.2008 – Supplemento Ordinario n. 30 (in Italian). [22] Alfano, G., Crisfield, M.A., Finite element interface models for the delamination analysis of laminated composites: mechanical and computational issues, Int. J. Num. Meth. Engin., 50 (2001) 1701-1736. [23] American Concrete Institute. Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (ACI 318R-05), (2005).