PSI - Issue 81

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 81 (2026) 269–275

© 2026 The Authors. Copy from the contract: 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 2025 organizers Keywords: Concrete; Strain Rate; Elastic-Plastic Coefficient; Dynamic Increase Factor; Deformability 1. Introduction Today, the vast majority of methods for calculating reinforced concrete elements and structures are based on the use of standard concrete deformation diagrams obtained during standard static load tests. The main characteristics of such diagrams with descending sections are the modulus of concrete elasticity c E , the compressive strength of concrete ck f and the corresponding critical deformations 1 c  , as well as the ultimate deformations of compressed concrete cu  . Tension concrete diagrams are also described using similar characteristics. When calculating reinforced concrete elements and structures for other types of loads, in particular dynamic ones, the above characteristics of standard concrete deformation diagrams are usually replaced with new characteristics that are relevant or adjusted for a specific type of load. For example, the strength of concrete under dynamic loads ck d f , is usually corrected using the dynamic strengthening coefficient c DIF . The modulus of concrete elasticity c d E , and its critical deformations c d 1,  are also corrected using coefficients similar in content. But the ultimate deformations of compressed concrete cu d ,  , as a rule, do not change. It is extremely important that all the above-mentioned coefficients are usually associated with the strain rate of concrete. At the same time, all the dependencies proposed today for their determination are purely empirical. No analytical relationship between Abstract This article is aimed at predicting the defining physical and mechanical characteristics of compressed concrete, which are necessary for the calculation of reinforced concrete elements under the action of any intensity loads. The methodology for determining these characteristics is based on the well-known law of conservation of potential energy of ultimate deformation (destruction) of concrete regardless of its strain rate. The interdependence of strength and deformation characteristics of compressed concrete at different strain rates is proposed to be predicted using a complex universal characteristic - the elastic-plastic coefficient of concrete. A function is proposed that allows predicting the probable variability of this characteristic for different classes of concrete in the widest range of its strain rates. VIII International Conference “In -service Damage of Materials: Diagnostics and Prediction“ (DMDP 2025) Universal design characteristics of compressed concrete at different strain rates OlenaRomashko-Maistruk, Vasyl Romashko , * 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 © 2026 The Authors. Copy from the contract: 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 2025 organizers 10.1016/j.prostr.2026.03.047