PSI - Issue 59

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 59 (2024) 352–359

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Abstract This article aims to develop a general model of concrete deformation in concrete and reinforced concrete elements and structures under various intensities dynamic loads. The main attention is paid to the well-known dynamic increase factor (DIF). The main advantages and disadvantages of the currently existing ways and methods of its determination have been classified and analyzed. An analytically justified dependence of the concrete DIF on the strain rate of compressed concrete was obtained. The effectiveness of the developed methodology for determining the DIF was evaluated by comparing the results of theoretical calculations with published experimental data of individual researchers. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Keywords: Concrete, strain rate, general model, specific potential energy, dynamic increase factor 1. Introduction It is common knowledge that even those concrete and reinforced concrete structures, which are designed for the action of only static or quasi-static loads, in reality perceive dynamic loads of various intensities. We are talking about separate loads associated not only with certain technological processes, but also with so-called "freelance" or emergency situations. The load rate and the strain rate of materials and structures can vary within quite wide limits. Thus, taking into account the opinion of the researchers vast majority (Rüsch (1972), Bischoff and Perry (1991), Han (1996), Ansell (2005), Riisgaard et al. (2007), Zhang et al. (2012), Othman and Marzouk (2016)) and according to VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Model of concrete deformation under the action of dynamic loads Olena Romashko-Maistruk a , Vasyl Romashko a, * a National University of Water Management and Environmental Engineering, Soborna 11, Rivne 33028, Ukraine

* Corresponding author. Tel.: +380-97-595-75-91. E-mail address: romashkovasyl@gmail.com

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 10.1016/j.prostr.2024.04.050