Basic HTML Version
609
IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 5
V. J. FERRARI | J. B. DE HANAI
to the experimental results occurred at a load of 133.37 kN, while
the numerical model indicated a yield at 129.64 kN. This value is
2.88% lower than the obtained experimentally. As for the failure of
the beam V2C, the numerical model indicated a value of load of
182.9 kN, while the experimental value was 196.35 kN.
In general, the numerical curves of load-deflection for the control beam
and strengthened beams presented a good concordance with the ex-
perimental curves. In the elastic phase, the behavior of the beams was
practically identical, except for the curve of model V2C, a little more rigid
than the experimental curve, even in this phase of loading.
Until the reinforcement yield, the numerical curves showed more
stiffness than the experimental curves. Additionally, after the rein-
forcement yield, the deflections represented by the models of the
strengthened beams were more pronounced than the experimen-
tal results.
In the Figure [18] is illustrated the comparisons of development of
strains in the strengthening obtained experimentally with the re-
sults extracted from the numerical analysis. The values of strain
refer to the middle section of the beam. For the beam V1C, the val-
ues of numerical strains of the strengthening in the middle of span
were highly correlated with the experimental values. Even after the
concrete cracking and the reinforcement yield, the development
of numerical strains represents satisfactorily the experimental val-
ues. Until the reinforcement yield, the numerical curve is slightly
more inclined than the experimental curves. After the reinforce-
ment yield, the numerical strains of strengthening develop more
pronouncedly and thereafter the failure occurs.
In the Figure [18-b] it is observed that the numerical model reflects
well the development of experimental strains in the strengthening
of the beam V2C. Before the reinforcement yield, the numerical
curve is more inclined than the experimental curve. Even after the
reinforcement yield, the numerical curve develops similarly to the
experimental strains.
6. Conclusions
This research aimed to propose and examine an innovative con-
structive technique for the flexural strengthening of RC beams.
Figure 1� � C�m�ari��� �e��ee� �umeri�a� a�� e��erime��a� �ur�e� ��a���e��e��i��
Beam V1A
Beam V1C
Beam V2C
A
B
C
Figure 1� � �umeri�a� an� e��erimenta� �train� in the mi���e �� the �trengthening
Beam V1C
Beam V2C
A
B