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IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 6
M. N. KATAOKA
| M. A. FERREIRA
| A. L. H. C. EL DEBS
one with a specific function:
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Hydraulic cylinder: load application;
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Strain Gages: measuring the strain in the negative reinforcement;
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Clinometers: measurement of rotations;
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Extensometers with removable base: measurement of displacements;
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Transducers: displacement measuring.
In order to determine the beam-column relative rotations trans-
ducers positioned on the corbel were used, following the same
scheme adopted by [12]. Clinometers were used to measure the
global rotation of the connection and transducers with remov-
able base were also used to the same intention, as indicated in
Figure 9. The use of clinometers is innovative for this purpose, so
another method to measure the rotation already tested was used, as
mentioned about the transducers. Figure 10 illustrates the layout of
the prototypes instrumentation.
3.4 Test set up
In the test set up were used three reaction frames each one with a
hydraulic jack. Two of them were placed at the end of the beams
for monotonic load application. The third one was placed on the
top of the column to the hydraulic jack apply a constant load. Fig-
ure 11 shows the final configuration of the test set up.
The hydraulic jack located at the top of the column applied a
constant force of 170 kN during all the test with the intention to
simulate the loading come from up floors and also to stabilize the
model. The clearances in the structure were eliminated by apply-
ing a force of 30kN and after this procedure the test began with
the application of the incremental monotonic load.
In the tests, a vertical load was applied in the end of the beams
generating negative bending moment on both sides of the col-
umn. The distance from the point of load application to the center
of connection rotation was 1.70 m. Under this point it was mea-
sured the vertical displacement, which configures an important
parameter for analyzing the behavior of the connection as well as
the rotation generated.
Figure 10 – Instrumentation of Models 1 and 2