Civil Engineering Reference
In-Depth Information
Poisson'sratio
ν
=
0.2 and the ultimate strain of the CF sheet
ε
Lk
(Section 8.1.3):
ε
juk
α
r
?
α
T
?
α
F
?
α
E
?
α
Z
?
ε
Lk
α
k
?
ν
?
ε
cc
Δ
ε
juk
0
:
25
?
0
:
7
?
1
:
0
?
1
:
0
?
0
:
75
?
15
:
2
1
:
5
?
0
:
2
?
0
:
44
1
:
863 mm
=
m
8.5.3 Distribution of transverse compression
The following factors take into account the non-uniform distribution of the transverse
compression over the cross-section owing to the different areas of in
uence of the
con
ning reinforcement made up of reinforcing steel and CF sheet. In addition, we
require the effective thickness of the inner link reinforcement
t
w,eff
to DAfStb guide-
line [1, 2] part 1 Eq. (RV 6.92) and the diameter of the core cross-section con
ned by the
reinforcing steel
D
c
to DAfStb guideline part 1 Fig. RV 6.13:
23 cm
2
a
sw
2
?
s
w
5
:
=
m
t
w
;
eff
0
:
262 mm
2
D
c
D
2
?
c
2
?
t
w
;
eff
500
2
?
30
2
?
0
:
262
439
:
5mm
It is thus possible to calculate the factors for the non-uniform distribution of the
transverse compression according to DAfStb guideline [1, 2] part 1 Eqs. (RV 6.90) and
(RV 6.91):
p
1
E
jl
?
ε
juk
690
?
0
:
001863
1
:
29
2
?
E
L
?
t
L
?
ε
juk
t
w
;
eff
?
f
wyk
p
1
?
c
p
2
D
c
c
2
?
230 000
?
0
:
75
?
0
:
001863
0
:
262
?
500
1
:
29
?
30
p
2
1
:
84
439
:
5
30
The reduction in transverse compression as a result of the different areas of influence of
the confining reinforcement to DAfStb guideline [1, 2] part 1 Eq. (RV 6.92) is required
for the next calculations:
2
?
E
L
?
t
L
?
ε
juk
p
1
p
2
?
c
Δ
p
p
1
D
c
2
?
230 000
?
0
:
75
?
0
:
001863
1
:
29
1
:
84
?
30
1
:
29
0
:
041
439
:
5
8.5.4 Multi-axial stress state in concrete
The characteristic compressive strength of the con
ned concrete is calculated using
DAfStb guideline [1, 2] part 1 Eq. (RV 6.65):
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