Title: Numerical Compressive Toughness of Steel Fiber-Based Reinforced Concrete with Various Densities

Author(s): Hak-Young Kim, Hye-Jin Lee, Keun-Hyeok Yang, and Seung-Jun Kwon

Publication: Materials Journal

Volume: 120

Issue: 6

Appears on pages(s): 61-70

Keywords: compressive toughness; concrete density; fiber reinforcing index; stress-strain relationship

DOI: 10.14359/51739114

Date: 12/1/2023

Abstract:
A reliable compressive stress-strain model was established for concrete with varying densities reinforced with either steel fibers alone, or a combination of steel fibers and micro-synthetic fibers. Moreover, a simple equation was presented to determine the compressive toughness index of fiber-reinforced concrete in a straightforward manner. The fiber reinforcing index was introduced to explain the effect of various parameter conditions of fibers on the enhancement of the concrete properties under compression. Numerical and regression analyses were performed to derive equations to determine the key parameter associated with the slope at the pre- and post-peak branches and compressive toughness index through extensive parametric studies. The proposed models are promising tools to accurately predict the stress-strain relationships of fiber-reinforced concrete with different densities, resulting in less-scattered values between experiments and predictions, and reasonably assess the efficiency of fiber reinforcements in enhancing the compressive response of concrete.