Issue 48

V. P. Berardi et alii, Frattura ed Integrità Strutturale, 48 (2019) 222-229; DOI: 10.3221/IGF-ESIS.48.23 228 C ONCLUSIONS new experimental setup for investigating the mode II fracture behavior of FRP-concrete composite structures was proposed in this paper. The presented approach allows to model the interface behavior between the adherends via few experimental data provided by testing machine load cell and DIC technique applied to proper regions of interest. The experimental methodology was validated within experimental tests on debonding failure of concrete blocks reinforced with GFRP pultruded laminate, carried out at the Design Machine Laboratory of the University of Salerno. Results of a preliminary test were presented and discussed in detail. The DIC method allows to provide with the full field displacement measurement, overcoming the limits of the conventional acquiring by LVDT or laser measurement devices. This non-contact optical technique has also allowed to evaluate the strain field with a good accuracy. The proposed test methodology can be easily extended in a near future to the analysis of long-term behavior of adhesive interface, accounting its viscous nature [34-39], against a limited computational and time burden due to the optimized use of DIC technique. R EFERENCES [1] Citarella, R., Cricrì, G., (2014). Three-dimensional BEM and FEM submodelling in a cracked FML full scale aeronautic panel, Applied Composite Materials, 21(3), pp. 557-577. [2] Corato, V., Affinito, L., Anemona, A., Besi Vetrella, U., della Corte, A., Di Zenobio, A., Fiamozzi Zignani, C., Freda, R., Messina, G., Muzzi, L., Perrella, M., Reccia, L., Tomassetti, G., Turtù, S., (2015). Detailed design of the large-bore 8T superconducting magnet for the NAFASSY test facility, Superconductor Science and Technology, 28(3), article No 034005. [3] Ascione, L., Berardi, V.P., Feo, L., Mancusi, G., (2005). A numerical evaluation of the inter-laminar stress state in externally FRP plated RC beams, Composites Part B: Engineering, 36(1), pp. 83-90. [4] Ascione, L., Berardi, V.P., Di Nardo, E., Feo, L., Mancusi, G., (2005). An experimental and numerical investigation on the plating of reinforced concrete beams with FRP laminates, Lecture Notes in Applied and Computational Mechanics, 23, pp. 303-314. [5] Marfia, S., Sacco, E., Toti, J., (2010). An approach for the modeling of interface-body coupled nonlocal damage, Frattura ed Integrità Strutturale, 12, pp. 13-20. [6] Marfia, S., Sacco, E., Toti, J., (2011). A coupled interface-body nonlocal damage model for the analysis of FRP strengthening detachment from cohesive material, Frattura ed Integrità Strutturale, 18, pp. 23-33. [7] Ronagh, H.R., Eslami, A., (2013). Flexural retrofitting of RC buildings using GFRP/CFRP - A comparative study, Composites Part B: Engineering, 46, pp. 188-196. [8] Bennati, S., Dardano, N., Valvo, P.S., (2012). A mechanical model for FRP-strengthened beams in bending, Frattura ed Integrità Strutturale, 22, pp. 39-55. [9] D’Ambrisi, A., Mezzi, M., Feo, L., Berardi, V.P., (2014). Analysis of masonry structures strengthened with polymeric net reinforced cementitious matrix materials, Composite Structures, 113(1), pp. 264-271. [10] Shardakov, I.N., Shestakov, A.P., Bykov, A.A., (2016). Delamination of carbon-fiber strengthening layer from concrete beam during deformation (infrared thermography), Frattura ed Integrità Strutturale, 38, pp. 331-338. [11] De Piano, M., Modano, M., Benzoni, G., Berardi, V.P., Fraternali, F., (2017). A numerical approach to the mechanical modeling of masonry vaults under seismic loading, Ingegneria Sismica, 34(4), pp. 103-119. [12] Berardi, V.P., De Piano, M., Teodosio, G., Penna, R., Feo, L., (2017), Advanced numerical models for the analysis of unreinforced and strengthened masonry vaults, in COMPDYN 2017 - Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, 2, pp. 5056-5069. [13] American Concrete Institute (ACI), (2017). Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures, ACI440.2R-17, Farmington Hills, MI. [14] Fédération Internationale du Béton (FIB), (2001). Technical report on the “Design and use of externally bonded fibre reinforced polymer reinforcement (FRP EBR) for reinforced concrete structures”, 1-138, ISBN 2-88394-054-1. [15] National Research Council of Italy, (2013). Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Existing Structures - CNR-DT 200R1-2013. Advisory Committee on Technical Regulations for Constructions, Rome. A