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Steel Portal Frame EC3 RUNET software
N c
,
Rd
A eff
M
0
fy
for class 4 cross-sections (ΕΝ 1993-1-1, 6.11)
A
area of cross-section
A
effective area of cross-section
eff fy
yield strength of steel
0
partial factors for material
In case the design value of shear is
V
Ed
> 0.50
V pl
,
Rd
the reduced yield strength is used.
2
1
fy
, where ρ =
2
V
V pl
Ed
,
Rd
1
(ΕΝ 1993-1-1, 6.29)
16.10.3 Bending moment ΕΝ 1993-1-1:2005 § 6.2.5
M
Ed
1
(ΕΝ 1993-1-1, 6.12)
M c
,
Rd
Design resistance of cross section for bending about the principal (y-y) or secondary (z-z) axis.
M y
,
Rd
M pl
,
y
,
Rd
W pl
,
y
M
0
fy
for class 1, 2 cross-sections (ΕΝ 1993-1-1, 6.13)
M z
,
Rd
M pl
,
z
,
Rd
W pl
,
z
fy
for class 1, 2 cross-sections
M y
,
Rd
M el
,
y
,
Rd
W el
,
y
M
0
fy
M
0
for class 3 cross-sections (ΕΝ 1993-1-1, 6.14)
M z
,
Rd
M el
,
z
,
Rd
W el
,
z
M
0
fy
for class 3 cross-sections
M
M y
,
Rd z
,
Rd
M
M c
,
y
,
Rd c
,
z
,
Rd
W eff
,
y
W eff
,
z
M
0
M
0
fy fy
for class 4 cross-sections (ΕΝ 1993-1-1, 6.15)
for class 4 cross-sections
W pl
,
y
W pl
,
z
plastic section modulus about principal and secondary axis,
W el
,
y
W el
,
z
elastic section modulus about principal and secondary axis,
W eff
,
y
W eff
,
z
effective section modulus about principal and secondary axis,
fy
yield strength of steel
0
partial factors for material
When bending moment acts together with axial force design check is performed according to :
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