Civil Engineering Reference
In-Depth Information
3.3.7 Effect of Fibers on Rotation Capacity
The specimens without
bers.
This decrease in deformation capacity is explained by localization of the defor-
mations in one large crack in case of the FRC specimens due to the higher bond
between rebars and concrete [
24
].
bers had a larger rotation capacity than those with
3.3.8 Effect of Fibers on Tensile Properties
Steel
bers enhance: the tensile properties of concrete, the resistance to cracking,
the pull-out resistance of tension reinforcement [
9
,
21
]. And the ultimate tensile
strength [
42
].
Fiber reinforcement enhances shear resistance by transferring tensile stresses
across diagonal cracks [
6
]. Fibers improve the resistance of tensile cracks both in
the web and in the tension zone [
31
].
3.3.9 Effect of Fibers on Crack Spacing
Fibers reduce crack spacing and widths giving place to a redistribution of stresses,
consequently, aggregate interlock is increased giving to FRC beams more stiffness
and a high load carrying capacity [
6
-
8
,
16
-
29
,
41
].
3.3.10 Effect of Fibers on Tension Stiffening
While plain concrete is assumed to carry tension between the cracks only, FRC is
able to carry signi
ects the
ability of concrete to carry tension between cracks, which increase member stiffness
before the reinforcement yields [
43
]. Tension stiffening in FRC depends on the
behavior between cracks and, at the cracks [
44
,
45
]. Tension stiffening improves
crack control and permits the use of higher-strength reinforcing steels while still
maintaining control of crack widths [
46
] provides an additional strength after
yielding of the reinforcement [
47
], depending on the type and amount of
cant tensile forces at a crack. Tension stiffening re
fl
bers
used.
Results from tension-stiffening tests can be used to determine the average tensile
strength carried by the cracked FRC, representing behavior between the cracks of a
reinforced concrete member [
48
].
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