“…One of the most common options for strengthening concrete structures is the reinforced concrete collar, carried out by joint grouting of damaged structures with concrete and the installation of an additional reinforcement frame. It is known that in reinforced concrete, due to its nonlinear properties under short-term dynamic loads, complex processes occur (Plevkov, 1996;Baumung et al, 2001;Plevkov et al, 2004;2008;Sarkisov et al, 2020;Venkiteela et al, 2013;Belov et al, 2016;Dong et al, 2017;Odnokopylov and Sarkisov, 2017;Gao et al, 2017;Chen et al, 2017;Demyanov and Kolchunov, 2017;Savinykh et al, 2018;He et al, 2020;Likhov et al, 2020;Orton et al, 2021). Therefore, the design of reinforced concrete structures under such types of impact is a scientific problem.…”