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IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 3
P. T. C. MENDES | M. L. T. MOREIRA
|
P. M. PIMENTA
The variation of the reinforcement ratio of the section from ρ
1
=
3.78% to ρ
3
= 2.68% has little repercussion in the intensity of the
maximum compressive stress, whose values vary from 6.79 MPa
to 6.94 MPa, to the same modulus of elasticity of concrete E
c
. A
reduction of the modulus of elasticity of concrete from E
c
to 0.5.E
c
mobilizes a larger area of the compressive region of the section,
Figure 15 – Distribution of the longitudinal compression stress - {DEAD}, cracked section
-2895
-2282
-2751
-10000
-9000
-8000
-7000
-6000
-5000
-4000
-3000
-2000
-1000
0
1 2 3 4 5 6 7 8 9 10 11 12
σ
c
(kN/m
2
)
{DEAD} -
ρ
1
- E
C
- Cracked
Medium value (top) = -2.506
Medium value (thicness) = -
1.923
(SOL) - TOP SLAB
(SOL) - THICKNESS
SLAB
(B-S) - TOP SLAB
Figure 16 – Distribution of the longitudinal compressive stress – {DEAD +
φ
.TB450}, cracked section