Theoretical analysis of RC beams reinforced with high strength rebar’s and steel plate

Abstract

The article introduces the comparative results of the deformability and fracture resistance of steel reinforced concrete beams with combined reinforcement obtained on the basis of laboratory tests with the results of computer-aided mathematical modelling of such structures. The results were compared for the purpose of mathematical model testing and its further usage in the study of the optimal reinforcement percentage in steel reinforced concrete beams with combined reinforcement. Results obtained on the basis of the proposed mathematical model show sufficient correlation with the experimental data up to the stage of structure strength exhaustion. As the result it enables to evaluate the features of destruction of the tested samples with the sufficient accuracy, namely, their load-carrying capacity, cracks formation, to analyze stresses in both steel bars and tapes, monitor deflections and deformations during the loading of the tested beams. Deviation of the experimental values for steel reinforced concrete beam with the combined reinforcement from the data obtained according to mathematical model: up to 5.0% for fracture resistance; up to 14.3% for deformability.

Analysis of shear behavior between old concrete and fiber concrete

“…There is a possibility of using other types of fibers, as well [11,12]. Very close to that problem are also works, which are dealing with strengthening columns by using the RC jacketing or the Carbon Fiber Reinforced Polymer (CFRP) laminates [13][14][15][16], but the fiber concrete was not used, like shown in this paper.…”

Determination of the Charring Rate of Timber to Estimate the Fire Resistance of Structures at Real Temperature Modes of Fires

“…Reinforced concrete is one of the most popular materials in construction [5][6][7][8][9]. Nowadays, there is the great number of works which analyze possibilities to improve the reinforced concrete structures' properties and increase their durability [10,11]. However, a significant number of buildings and structures require renovation and strengthening [12,17].…”

Specifics of physico-mechanical characteristics of thermally-hardened rebar

“…It is important to note, that this material is complex multicomponent heterogeneous system with synergistic properties, which on the one hand allows its effective use in a wide range of structures, and on the other -causes the ambiguity of its stress-strain state under the influence of external impacts (Fomin et al, 2021;Klymenko, et al, 2020;Klymenko et al, 2019). Modeling the work of reinforced concrete structures under adverse external influences should account specific properties of individual components, -concrete stone and steel bars (Bobalo et al, 2019b;Bobalo et al, 2020;Blikharskyy et al, 2021b;Blikharskyy et al, 2021a;Bambura et al, 2018;Czajkowska et al, 2020;Karpiuk et al, 2020;Blikharskyy et al, 2020b;Lipiński, 2017;Kramarchuk et al, 2021).…”