The advantages of using work-hardening, high-performance fiber reinforced concrete (HPFRC) in critical areas of earthquake resistant structures are increasingly recognized. Due to their ductile behavior HPFRCs is particularly attractive for use in areas where a large inelastic deformation capacity is needed to withstand the demands caused by a severe earthquake. Test results showed that HPFRCs serve as a substitute for specific details of seismic reinforcement by providing additional shear strength and confinement, which could lead to important simplifications in the construction of earthquake resistant structures.
In 1987, Naaman proposes to classify the fiber reinforced
concrete is based on the tensile behavior after cracking (Fig. 1). When the
rate of hardening behavior has been observed, the mixture is classified as
high-performance fiber reinforced cement (HPFRC). When the strain softening
behavior is observed, the mixture is classified as a simple fiber reinforced
concrete (FRC).
After the first crack occurs HPFRC subjected to direct
tension, the fibers bridge the crack to carry a greater load, thus increasing
the composite cracking. This cracking process, which eventually leads to a
dense mass of fine cracks, damage continues to locate the (substantial removal
of the fiber) is one or a few cracks, traction typically between 0.5 and 3%.
FRC on a regular basis, on the other hand, because the fibers can not carry
more load after cracking, the location of damage will start as soon as the
first structural cracking occurs.
The fibers also increase the compression behavior of
concrete, especially by increasing the voltage on capacity. HPFRCs has shown to
exhibit a very similar behavior in the confined concrete, load capacity
exceeding 1%. This suggests that the confinement reinforcement relaxations are
possible when using HPFRCs than concrete.
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