The Optimal Shape Of Curvilinear Fibers In FRC
Author(s)
P. Procházka & N. Starikov
Abstract
In the problem of cracking of composite structures of several sorts, the pullout
problem has frequently been solved. In some previous papers by the authors,
curvilinear fibers reinforcing concrete mainly during its curing process have been
studied. It was shown that the fibers of Dramix type proved to have a higher
local bearing capacity than the straight fibers. The problem was solved in 3D on
a unit cell assuming a periodicity of fiber placing. The linear behavior of
concrete was taken into account and the pullout test was simulated by the finite
element method. In this paper the optimal slope of fibers is sought. Using similar
computations as those which were carried out in the above-mentioned papers, the
optimum conditions have been added. They obey the typical Mohr-Coulomb law
along the fiber-concrete interfacial zones and the compressive strength in the
concrete cannot be exceeded at any point. The study is carried out on different
unit cells, i.e. different positioning of fibers is considered. A different fiber ratio
is also considered to show the mechanical behavior and to limit analysis of the
composite aggregate.
1 Introduction
In many branches of structural engineering fiber reinforced concrete has been
used with different types of fibers. Because this study was financially supported
from a grant project, which is concentrated on geomechanical structures,
principally on reinforcement of tunnel linings and foundations, the steel fibers
are considered in this paper. They play very important role particularly during
curing process of concrete, as they suppress local cracking and warping in the
composite structure and avoid a possibility of corrosion of reinforcing steel rods.
Very important fact follows from plenty of experimental studies: since the steel
fibers are more stiff then concrete itself, pullout problem has to be solved when
Keywords
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