Effect of Steel Fiber Content on Shear Behavior of Reinforced Expanded-Shale Lightweight Concrete Beams with Stirrups

Abstract

To determine the validity of steel fiber reinforced expanded-shale lightweight concrete (SFRELC) applied in structures, the shear behavior of SFRELC structural components needs to be understood. In this paper, four-point bending tests were carried out on reinforced SFRELC beams with stirrups and a varying volume fraction of steel fiber from 0.4% to 1.6%. The shear cracking force, shear crack width and distribution pattern, mid-span deflection, and failure modes of test beams were recorded. Results indicate that the shear failure modes of reinforced SFRELC beams with stirrups were modified from brittle to ductile and could be transferred to the flexure mode with the increasing volume fraction of steel fiber. The coupling of steel fibers with stirrups contributed to the shear cracking force and the shear capacity provided by the SFRELC, and it improved the distribution of shear cracks. At the limit loading level of beams in building structures at serviceability, the maximum width of shear cracks could be controlled within 0.3 mm and 0.2 mm with the volume fraction of steel fiber increased from 0.4% to 0.8%. Finally, the formulas are proposed for the prediction of shear-cracking force, shear crack width, and shear capacity of reinforced SFRELC beams with stirrups.

Shear Capacity and Behaviour of Bending Reinforced Concrete Beams Made of Steel Fibre-Reinforced Waste Sand Concrete

“…The stirrups can be partially replaced by steel fibres and the combination of steel fibres and stirrups showed a positive effect on the mechanical behaviour of the composite. Similar conclusions have been reached by Ding et al [ 22 ] and Li et al [ 6 ]. Zhao [ 23 ], in his work, additionally characterized the effect of fibres on the reduction of diagonal cracks and strain after cracking.…”

“…Fibre-reinforced concrete was first used 140 years ago when, in 1874, Bernard submitted his first patent application for steel fibre-reinforced concrete. Since that time, attempts have been made to both evaluate the impact of the fibres on concrete properties [1][2][3][4][5][6][7][8][9], as well as distribution of fibres in the concrete [10][11][12]. Fibre-reinforced concrete has, therefore, become an alternative to ordinary concrete.…”

A Study on the Mechanical Characteristics of Glass and Nylon Fiber Reinforced Peach Shell Lightweight Concrete

“…Past investigations indicated that lightweight aggregate concrete with more compressive strength could be made; however, the concrete was inclined to brittleness and poor elasticity because an aggregate that is lightweight is typically more brittle in strain (Elongation) [ 13 , 14 ]. The compressive strength capacity of lightweight aggregate concrete is 10 times more than its tensile strength [ 15 , 16 ]. Utilization of peach shells rather than normal crushed aggregates positively affects unit weight, and reduction of unit weight up to 25% might be accomplished.…”

Multivariable Regression Strength Model for Steel Fiber-Reinforced Concrete Beams under Torsion

“…Previous studies on SFRC have primarily focused on its tensile [ 9 , 20 , 21 , 22 ], shear [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ], and flexural behavior [ 5 , 32 , 33 , 34 ]. While, the number of studies on SFRC’s torsional behavior remains limited, although in some load cases the torsional response of beams may govern the overall structural behavior.…”