Civil Engineering Reference
In-Depth Information
ε
cu
longitudinal strain in confined concrete at failure of fibre-reinforced material.
E
jl
?
ε
juk
f
cm
ε
cu
ε
c2
?
1
:
75
19
?
(7.62)
ε
yk
strain in reinforcing steel upon reaching the characteristic yield strength:
ε
yk
=
f
yk
/
E
s
ϕ
w
bar diameter of transverse reinforcing steel
ϕ
s
bar diameter of longitudinal reinforcing steel
K
φ
factor to allow for creep to DIN EN 1992-1-1.
K
φ
1
β
?
φ
ef
(7.63)
β
factor to allow for the properties of the reinforced concrete column.
f
ck
200
λ
150
β
0
:
35
(7.64)
λ
slenderness of reinforced concrete column
φ
ef
effective creep coefficient.
M
0Eqp
M
0Ed
φ
ef
k
?
β
f
cm
?
β
0
;
k
?
(7.65)
M
0Ed
design value of acting bending moment according to first-order theory.
The system coefficients [
k
1
]to[
k
9
] and the values
E
L
,
t
L
,
ε
Lk
must be taken from a
national technical approval.
Fig. 7.9
In
uence of slenderness
λ
on loadbearing capacity in M-N interaction diagram
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