PSI - Issue 44

Carlo Vienni et al. / Procedia Structural Integrity 44 (2023) 2262–2269 Vienni et al. / Structural Integrity Procedia 00 (2022) 000–000

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respectively. The results of the experimental campaign in terms of strength, stiffness, and displacement capacity were analyzed: 2-sides and 1-side reinforced panels have shown an increase in shear strength as respect to the unreinforced one of about 12% and 7%, respectively; the registered increase in stiffness has been of 37% and 17% for 2-sides and 1-side reinforcement, respectively. Regarding the ultimate displacement, the application of two layers of CRM has provided a significant drift increase, while the one-side reinforced wall has shown a slight reduction. For both reinforced panels, the peak load was reached when the first diagonal cracks in mortar and masonry appeared; subsequently, the detachment at the masonry-to-mortar interface was observed: the delamination is the mechanism that controls CRM efficiency; in fact, once detachment occurred a fast strength degradation was observed. Connectors have shown little influence on the stress transfer at the masonry-to-mortar interface, while they appear to be important to confine the walls and maintain their integrity even in presence of advanced damages. The experimental campaign is still in progress and provides for the realization of three additional tests. Acknowledgments The experimental test campaign has been carried out using the CRM system developed by the society Ruregold. The authors gratefully acknowledge Ing. Marco Quaini, Ing. Santi Urso, and Ing. Maksym Barlit for providing materials for the reinforcement system. The authors also thank OFFICINA OMAR S.n.c. from Prato in the person of Walter Rozzi for manufacturing part of the steel pieces of the loading setup and the technicians Enzo Barlacchi and Andrea Giachetti of the Testing Laboratory of the Department of Civil and Environmental Engineering of Florence for the useful help during the tests. References Beyer, K., Petry, S., Tondelli, M., P. A. 2014. Towards displacement-based seismic design of modern unreinforced masonry structures. In: Ansal A Perspectives on European earthquake engineering and seismology. Springer International Publishing, pp 401–428. In Geotechnical, Geological and Earthquake Engineering (Vol. 34). D’Antino, T., Carozzi, F. G., & Poggi, C., 2019. Diagonal shear behavior of historic walls strengthened with composite reinforced mortar (CRM). Materials and Structures/Materiaux et Constructions, 52(6), 1–15. https://doi.org/10.1617/s11527-019-1414-1 Del Zoppo, M., Di Ludovico, M., Balsamo, A., & Prota, A., 2019. In-plane shear capacity of tuff masonry walls with traditional and innovative Composite Reinforced Mortars (CRM). Construction and Building Materials, 210, 289–300. https://doi.org/10.1016/j.conbuildmat.2019.03.133 Donnini, J., Maracchini, G., Lenci, S., Corinaldesi, V., & Quagliarini, E., 2021. TRM reinforced tuff and fired clay brick masonry: Experimental and analytical investigation on their in-plane and out-of-plane behavior. Construction and Building Materials, 272, 121643. https://doi.org/10.1016/j.conbuildmat.2020.121643 EN 772-1. 2010. Metodi di prova per muratura. 4. Gattesco, N., Amadio, C., Barelli, S., Bedon, C., Rinaldin, G., & Zorzini, F., 2013. Analisi ciclica di pareti murarie in pietrame rinforzate mediante intonaco armato con rete in GFRP. 15 Convegno Nazionale “L’ingegneria Sismica in Italia”, 30 Giugno-4 Luglio, Padova, Id G11. Gattesco, N., & Boem, I., 2015. Experimental and analytical study to evaluate the effectiveness of an in-plane reinforcement for masonry walls using GFRP meshes. Construction and Building Materials, 88, 94–104. https://doi.org/10.1016/j.conbuildmat.2015.04.014 Magenes, G., & Calvi, G. M., 1997. In-plane seismic response of brick masonry walls. Earthquake Engineering and Structural Dynamics, 26(11), 1091–1112. https://doi.org/10.1002/(SICI)1096-9845(199711)26:11<1091::AID-EQE693>3.0.CO;2-6 Orlando, M., Salvatori, L., Spinelli, P., & De Stefano, M., 2016. Displacement capacity of masonry piers: parametric numerical analyses versus international building codes. Bulletin of Earthquake Engineering, 14(8), 2259–2271. https://doi.org/10.1007/s10518-016-9903-x UNI EN 1015-11, U. E., 2013. Metodi di prova per malte per opere murarie Parte 11 : Determinazione della resistenza a flessione e a compressione della malta indurita UNI EN 1015-11. 5972936. Vasconcelos, G., & Lourenço, P. B., 2009. In-Plane Experimental Behavior of Stone Masonry Walls under Cyclic Loading. Journal of Structural Engineering, 135(10), 1269–1277. https://doi.org/10.1061/(asce)st.1943-541x.0000053 Wilding, B. V., Dolatshahi, K. M., & Beyer, K., 2017. Influence of load history on the force-displacement response of in-plane loaded unreinforced masonry walls. Engineering Structures, 152, 671–682. https://doi.org/10.1016/j.engstruct.2017.09.038