Stress-Strain State of Steel Fiber-Reinforced Concrete under Compression Taking into Account Unloading from Inelastic Region

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Abstract

The purpose of the study is to examine the physical and mechanical characteristics of steel fiber-reinforced concrete under compression, including: modulus of elasticity, Poisson ratio, values of ultimate strains under compression, values of compressive strength with different percentages of dispersed reinforcement. An experimental investigation program, which included the production of cube samples measuring 100×100×100 mm, as well as a compression test under static loading, taking into account unloading from the region of inelastic deformations, was developed and carried out. Two types of steel fiber were chosen as dispersed reinforcement: hooked end and wave shape. The volume content of steel fiber in the cube samples was 0.5, 1.0, 1.5 and 2.0 %. As a result of the investigation, the strength and deformation characteristics of steel fiber reinforced concrete under compression were obtained. Based on the experimental data, actual strain diagrams of steel fiber reinforced concrete were constructed, taking into account the type of reinforcing fibers and the percentage of reinforcing fiber. Based on the obtained diagrams, a law of deformation of steel fiber reinforced concrete is proposed, which can be described by a polynomial function of the fourth order with constant coefficients that determine the shape of the stress-strain curve. The presented research results can be used in developing a methodology for physically nonlinear analysis of steel fiber reinforced concrete elements with a percentage of dispersed reinforcement from 0.5 to 2.0 %.

About the authors

Vladimir P. Agapov

RUDN University

Email: agapovpb@mail.ru
ORCID iD: 0000-0002-1749-5797
SPIN-code: 2422-0104

Doctor of Technical Sciences, Professor of the Department of Civil Engineering, Engineering Academy

Moscow, Russia

Alexey S. Markovich

RUDN University; National Research Moscow State University of Civil Engineering

Email: markovich-as@rudn.ru
ORCID iD: 0000-0003-3967-2114
SPIN-code: 9203-1434

Candidate of Technical Sciences, Associate Professor of the Department of Civil Engineering, Academy of Engineering

Moscow, Russia

Prashanta Dkhar

RUDN University

Email: dkhar-p@rudn.ru
ORCID iD: 0000-0002-7888-5350
SPIN-code: 5670-7662

Candidate of Technical Sciences, Senior Lecturer of the Department of Civil Engineering, Academy of Engineering

Moscow, Russia

Darya A. Golishevskaia

RUDN University

Author for correspondence.
Email: miloserdova-da@rudn.ru
ORCID iD: 0000-0003-0835-528X
SPIN-code: 1276-6516

Assistant of the Department of Civil Engineering, Academy of Engineering

Moscow, Russia

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Copyright (c) 2024 Agapov V.P., Markovich A.S., Dkhar P., Golishevskaia D.A.

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