STRESS-STRAIN STATE OF REINFORCED CONCRETE WHEN EXPLOSIVES ACT ON IT IN ENCLOSING STRUCTURES OF PROTECTIVE STRUCTURES OF CIVIL BUILDINGS

Abstract

The results of theoretical and experimental studies of the properties of reinforced concrete and its improvement, especially under dynamic and extreme loads, are presented. The main attention is paid to the analysis of the influence of dynamic explosive waves on the mechanical properties of concrete and the optimization of its composition using fiber.

Research confirm that the use of polymer fiber in concrete mixtures significantly improves the mechanical characteristics of the material, providing increased crack resistance, impact strength and durability. Fiber concrete demonstrates the ability to effectively counteract dynamic loads, which makes it promising for use in protective structures, especially in high-risk areas. Fiber concrete is significantly superior to traditional concrete due to its ability to slow the spread of cracks, which reduces the risk of brittle fracture. In explosive conditions, this is critically important, since ordinary concrete has a tendency to sharp destruction with the formation of fragments that can pose an additional threat. The inclusion of polymer, steel or glass fibers in the concrete mixture allows to achieve a uniform distribution of stresses and improve the overall mechanical properties of the material. Experimental studies have confirmed that fiber concrete beams show an increase in limiting moments by 20-40% compared to traditional concrete elements.

Reinforced concrete structures with the addition of fiber helps to reduce the risk of sudden destruction and the formation of dangerous debris, which increases safety when used in civil protection structures.

Further development of such materials opens up wide opportunities for their adaptation to modern construction challenges, in particular under martial law, ensuring their reliability, durability and economic efficiency of the structure.