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FIBRO REINFORCED CONCRETE PLATE DYNAMICS ON DEFORMABLE SUPPORTS WITH VARIABLE AREA OF BLAST LOAD

https://doi.org/10.33979/2073-7416-2022-103-5-23-33

Abstract

The article is devoted to the numerical analysis of the stress-strain state of fiber reinforced concrete slab structures under emergency dynamic impacts. A prefabricated cover slab of a protective structure buried in the ground is considered. Shock effects on the slab are considered to be blast ones. An explosion at the ground surface or another impulse transmitted through the ground to the structure is assumed to be the cause of their occurrence. The change in time of the components of the stress-strain in concrete and reinforcement is investigated in case of change in the suppleness of the supports. The possibility of rigid or elastoplastic deformation of supports under impact action is considered. By means of a concrete example, the efficiency of the suggested approach is demonstrated under symmetric loading by a blast load taking into account a variable shock spot area. Numerical modeling has shown that under both static and dynamic additional loading the slab fractures along the fibro concrete with the formation of a cable mechanism while preserving the survivability property of the reinforcement. It is shown that the use of compliant supports plays an essential role in damping of vibrations and allows to regulate both the level of mechanical safety of the structure and its material capacity. The necessity and urgency of determining the actual damping properties of the structures of the considered type has been established.

About the Authors

Anatoliy V. Alekseytsev
Moscow State University of Civil Engineering
Russian Federation


Natalia S. Kurchenko
Moscow State University of Civil Engineering
Russian Federation


Svetlana An. Sazonova
Moscow State University of Civil Engineering
Russian Federation


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Review

For citations:


Alekseytsev A.V., Kurchenko N.S., Sazonova S.A. FIBRO REINFORCED CONCRETE PLATE DYNAMICS ON DEFORMABLE SUPPORTS WITH VARIABLE AREA OF BLAST LOAD. Building and Reconstruction. 2022;(5):23-33. (In Russ.) https://doi.org/10.33979/2073-7416-2022-103-5-23-33

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