Purpose: Determine the state of stress-strain, formation and development cracks,
three-layer beam diagrams of load-compression stress, load-tension stress, load-vertical
displacement relationships with a change in concrete grade.
Design/methodology/approach: This paper presents the results of an ANSYS numerical
simulation analysis involving stress-strain state and cracking of the steel fiber concrete
layers of three-layer reinforced concrete beams with the upper and lower layers. With a
cross-section of 150x300 mm, a total span of 2200 mm and an effective length of 2000 mm,
the middle is a normal concrete layer. Under two-point loads, all the beam samples were
tested. The research simulated three-layer concrete beams in different layers of beams with
a change in concrete grade, and compared with and without the use of steel fibers in layers
of concrete beams, including the nonlinearity of the material considered.
Findings: A diagram of the formation and development of cracks in three-layer concrete
beams has been constructed by the study results, determining the load at which the
concrete beams begin to crack, the load at which the concrete beams are damaged. In the
middle of three-layer steel fiber reinforced concrete beams, load-compression stress, loadtension
stress, load-vertical displacement relationships are established. Study results show
that these three-layer concrete beams appear to crack earlier than in other cases in cases
2 and 3, but the beam bearing capacity is damaged at 67 kN, the earliest in case 3. And
case 6 at 116 kN is the latest. The effects of case 1 and case 3 are small compared with and
without the use of steel fibers in cases, while the effects of case 5 and case 6 are very high.
Research limitations/implications: The research focuses only on the change of
concrete grade in the layers, but the input parameters affecting three-layer steel fiber
concrete beams have not been researched, such as the number of tensile steel bars, tensile
steel bar diameter, steel fiber content in concrete, thickness variation in three-layer concrete
beam layers, etc.
Practical implications: Provides a result of experimental study and ANSYS numerical
simulation in multi-layer steel fiber concrete beams.
Originality/value: The analysis of multi-layered steel fiber concrete beams using
experimental and simulation methods shows that other parameters influencing the beams
will continue to analysis the working stages of three-layer beams.
Reinforced concrete beams strengthened with steel fiber concrete