ANALYSIS OF BENDING STEEL FIBER REINFORCED CONCRETE ELEMENTS WITH A STRESS-STRAIN MODEL

Abstract

Introduction: Fiber concrete is a complex composite material with unique properties. Its behavior is accounted for in steel fiber reinforced concrete elements using simplified stress-strain models. The article describes an approach to the analysis of bending steel fiber reinforced concrete elements using stress-strain diagrams for compression and tension. Purpose of the study: The study is aimed to develop a method for the analysis of bending steel fiber reinforced concrete elements using stress-strain diagrams that will be simpler than the existing ones. Methods: The study is based on the traditional principles of the analysis of reinforced concrete structures. The method applied is described through equations for the equilibrium of forces affecting the longitudinal axis of the element and the ultimate bending moment. Internal forces in the element cross-section are expressed as relative strains whose diagram is nearly linear in accordance with the Bernoulli’s hypothesis. Results: We present final equations to determine the load-carrying capacity of a bending element by standard cross-sections. The values of strength and stress-strain properties of fiber reinforced concrete and reinforcement serve as the source data for the calculations.

Keywords

• fiber concrete
• steel fiber reinforced concrete
• non-linear stress-strain model
• fiber reinforced concrete and reinforcement stress-strain diagrams
• relative strains.