DESIGN OF A PROTOCOL FOR TENSILE TESTING OF LOW ALLOY STEEL REBARS FOR STEEL REBARS FOR CONCRETE REINFORCEMENT UNDER NTC 2289 AND NTC 3353. CONCRETE REINFORCEMENT, UNDER NTC 2289 AND NTC 3353 STANDARDS.

Abstract

A tensile test for a metallic
material allows to performance a mechanical
characterization of the material. An axial load
is applied to a test item.
As the load is applied, deformation
measurements are taken, which are used
to construct the stress-strain curve, up to
the point of maximum load or maximum
resistance.
With the construction of the graph,
characteristics of the material such as yield
stress, maximum stress, and deformation after
fracture is obtained.
This data is very important for the
validation and evaluation of the quality
of the steels to be used in sectors such as
corrugated steel, which is a material of great
interest in the construction industry, since it
is used in concrete reinforcement works in
structures with seismic resistant design..
However, when performing tensile
tests there are unknowns with respect to
how the results can be affected by the
speed of the test in determining your results
can be affected by the speed of the test in
determining its mechanical characteristics.
Although there are international
technical standards for the execution of tensile
tests that provide adequate methods and
ranges for the selection of the test speed,
there are international technical standards for
the execution of tensile tests. the final choice
of this is left to the analyst to decide on which
is the most appropriate, however, when it is
desired to compare results between different
laboratories for the same or similar items,
the choice of a velocity method and a given
velocity value influences the comparability of
the results.
This paper presents the design of
a tensile test protocol for rebars used in
infrastructure, based on NTC 2289 used in
infrastructure, based on the standards NTC
2289 CORRUGATED AND SMOOTH
BARS OF LOW ALLOY STEEL FOR
CONCRETE REINFORCEMENT and
NTC 3353 SIDERURGY.
LOW-ALLOY STEEL SLABS FOR
CONCRETE REINFORCEMENT and NTC
3353 SIDERURGY. DEFINITIONS AND
METHODS FOR MECHANICAL TESTING
OF STEEL PRODUCTS.
The test protocol consists of the
minimum requirements that a SENA
the laboratory must have in order to carry
out an intercomparison exercise, this is
all guaranteed by a third-party entity
known as the Colombian Accreditation
Body (ONAC, Organismo de Acreditación
de Colombia) which is, again, the one
in charge to perform the tensile tests.
In addition to the administrative
requirements, the requirements that must
be met to carry out the tests are described,
with the requirements that must be met to
perform the tests, based on the operating
the capacity of the universal testing machine
of each center, the length of the minimum
the length that must be used in the rebars is
defined, and a series of speeds are proposed
according to the series of speeds are
proposed according to the requirements
described in the NTC 3353 standard in
numeral 8.4 and the diameter of the rebars
to be used.