Nonlinear analysis of multi-layer steel fiber reinforced concrete beams

Tóm tắt

ABSTRACT
This paper presents the results of an experimental study involved testing of double-layer reinforced concrete beams in two cases: steel fiber concrete layer is located below, and is located above of the normal concrete layer. The size of the beams is 15×30×220cm, in which the steel fiber concrete layer is 10cm thick, all the beam samples were tested under two-point loads. ANSYS has simulated experimental beams as load-vertical displacement relationship, load- compression strain relationship, load-tensile strain relationship at the middle of the span of the beams. Experimental results and numerical simulation of ANSYS of double-layer steel fiber concrete beams were compared with three-layer steel fiber reinforced concrete beams of the same size. In three-layer steel fiber reinforced concrete beams, the 10cm thick steel fiber concrete layer is located below, and is located above, a middle layer is the normal concrete layer. Concrete of beams is B30 for all layers, all types of beams with steel fiber content in concrete is 2% by volume, with nonlinear material analysis in ANSYS numerical simulation. The data are compared with each other results show that the two-layer steel fiber reinforced concrete beams are damaged the slowest, the three-layer fiber concrete beams are damaged very early in other beams. Experimental results also show that the vertical displacement, tensile strain and compressive strain values are 30-40% larger than the simulated 2-layer and 3-layer beams.

Keywords: steel fiber, stress-strain, crack, multi-layer beam, ANSYS, experiment, testing