Abstract
The usage of steel fiber reinforced concrete in monolithic joins is well known as a good alternative of additional reinforcement because of chaotic distribution of steel fibers in complex stress and strain state. Unfortunately, the analysis of well known design codes and different models even in punching case without steel fibers shows that there is no common theory in calculating punching shear strength. Existing models of punching shear strength with steel fibers are mainly based on empirical coefficients, or require direct tests, what makes the design of such structures more complicated. Besides, the analysis of elastic and plastic characteristics of steel fiber reinforced concrete is incomplete, because there is no unified, well-grounded theory to evaluate them. The aim of this paper is to present a steel fiber reinforced concrete punching shear strength model. Suggested steel fibers reinforced concrete punching shear strength model estimates the main factors, such as concrete strength, longitudinal reinforcement, steel fibers volume, type, geometric and anchoring characteristics, and also plastic strains of steel fiber reinforced concrete. The comparison of suggested model with tests results demonstrates good accuracy of the suggested model for steel fiber reinforced concrete slabs (mean value – 1.12, standard deviation – 0.08 coefficient of variation – 7%).
Highlights
In many cases complicated stress and strain state due to load action in structures of bridges appears
The usage of steel fibre reinforced concrete in monolithic joins is well known as a good alternative of additional reinforcement because of chaotic distribution of steel fibres in complex stress ant strain state
Existing models of punching shear strength with steel fibres are mainly based on empirical coefficients, or require direct tests, what makes the design of such structures more complicated
Summary
In many cases complicated stress and strain state due to load action in structures of bridges appears. In the case of complicated stress state reinforcing by bars becomes either complicated or even economically unjustifiable. Such state of stress takes place in some bridge structures, e. G. in superstructure decks supported on columns and these – on foundation reinforced concrete (RC) slab (Fig. 1). For such structures or its elements more effective materials are materials with higher mechanical and deformation properties in all directions of axis. Such material for many RC structures is steel fibre reinforced concrete (SFRC) (Baikovs, Rocēns 2010; Szmigiera 2007; Šalna, Marčiukaitis 2007)
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