Mechanical flexural properties of concrete with melt-extract stainless steel fibres

Abstract

An experimental study is performed to evaluate the effect of melt-extract stainless steel fibres on mechanical and flexural properties of concrete. A total of seventy-two specimens are used to determine an optimum fibre dosage and mechanical properties of plain and steel fibre reinforced concrete. Twelve full-scale beam specimens are then exposed to four-point bending tests. The effect of melt-extract stainless steel fibres on flexural behaviour of beams is quantified in this testing. A beam specimen is exposed to four-point bending, after being subjected to 15000 cycles of fatigue load. Pre- and post-fatigue flexural properties of beams with melt-extract steel fibres are compared and discussed.

Flexural Behavior of Steel Fiber Reinforced Concrete Beams: Probabilistic Numerical Modeling and Sensitivity Analysis

“…Steel in longitudinal bar reinforcement is modeled using the Giuffré-Menegotto-Pinto model (i.e., Steel02 in OpenSEES). The values of yield strength and elastic modulus varied among experiments and are given in [2,10,12]. The hardening ratio was assumed to be 0.01, and the parameters that control the transition from the elastic to the plastic branch of the steel stress-strain relation were R 0 = 15, cR 1 = 0.925, cR 2 = 0.15 for all specimens used for numerical model validation.…”

“…The probability distributions and their CoVs characterizing the uncertainties in concrete compressive and tensile strength, concrete elastic modulus, steel yield strength and steel elastic modulus are adopted based on the recommendations by Wisniweski et al [30]. It is assumed that the CoVs of material properties defined for plain concrete can be used for SFRC, as the CoVs suggested by [30] are similar or lower to the CoVs of the SFRC's material properties obtained experimentally [2,6].…”

“…The proposed numerical model is validated on four-point beam bending experiments available in the literature [2,10,12,36]. All experiments used for validation were performed on a beam reinforced with longitudinal reinforcement and steel fibers, loaded in thirds of the span with two vertical forces of equal intensity.…”

“…The RB-SF specimen tested by [2] is used as a case study to illustrate how the proposed numerical model and sensitivity analysis method can be used to identify material properties that are the main sources of uncertainty in the beam's flexural behavior. To illustrate the probabilistic numerical model, 50 realizations of the proposed probabilistic numerical model are performed and the consequent load-deflection relations are presented in Figure 12.…”

“…Brittle failure of concrete in tension can be avoided or delayed by adding randomly dispersed steel fibers to the concrete mixture. Experimental investigations conducted in the last few decades identified several advantages of steel fiber reinforced concrete (SFRC) over conventional reinforced concrete, such as higher tensile and shear strength, improved cyclic response, higher spalling resistance and improved post-cracking behavior [1][2][3][4].…”