Simulating the orientation of Steel fiBerS in reinforced concrete

assbedUrban and Civil

Nov 25, 2013 (3 years and 7 months ago)

95 views

1 2
F RAUNHOF E R I NS t I t Ut E F OR bUI l dI Ng p HyS I CS I bp
Fraunhofer Institute
for building physics Ibp
Department of Building Chemistry,
Building Biology, and Hygiene
Working group on concrete technology
and functional construction materials
Fraunhoferstrasse 10
83626 Valley, Germany
Contacts
Dipl.-Ing. Christof Karlstetter
Phone +49 8024 643 270
christof.karlstetter@ibp.fraunhofer.de
Dipl.-Ing. (FH) Norbert Leiss
Phone +49 8024 643 296
norbert.leiss@ibp.fraunhofer.de
www.ibp.fraunhofer.de
1
Steel-fiber-reinforced concrete drill core.
2
Fiber orientation in a single plane of a
steel-fiber-reinforced concrete test core sam-
ple: Simulation (left) and CT image showing
the steel fibers in a contrasting color (right).
background
The conventional practice of embedding
steel rods in reinforced concrete drives
up building costs due to the high cost
of steel and the time involved in arming
the structure. In certain cases, traditional
steel reinforcements can be partially or
entirely replaced by steel fibers incorpo-
rated in the concrete components.
The drawback of fiber-reinforced con-
crete is that its strength relies on the
orientation and concentration of the fi-
bers, which can lead to failure if the load
exceeds the given limits. Even increasing
the volume of fibers in the concrete ma-
trix is no guarantee of safety because
such measures cannot compensate for
other factors such as an unsuitable fiber
orientation.
CoRheoS simulation software
The CoRheoS simulation software was
developed to enable the orientation of
steel fibers in reinforced concrete to be
reliably predicted for a selected range of
component geometries. The results con-
firm that it is possible to achieve a high
concordance between the simulation
and the real-life situation. The simulation
program can also produce a realistic es-
timation of the fiber orientation around
hollow spaces deliberately incorporated
in the finished structure.
Benefits
The software provides an efficient means
of designing fiber-reinforced building
components in which the fiber orienta-
tion corresponds to the necessary coun-
teracting forces.
The main beneficiaries are concrete-pro-
cessing companies that need to precisely
control the formwork filling process to
avoid potential cracks in the concrete.
Simulating the
orientation of Steel fiBerS
in reinforced concrete