Civil Engineering Reference
In-Depth Information
considering the interaction between plate and column buckling using the
reduction factor
r
c
.
3.8.5.2 Stiffened Plate Elements with Longitudinal Stiffeners
areas from local buckling of the various subpanels between the stiffeners and
the effective
p
areas from the global buckling of the stiffened panel should be
accounted for. The effective
p
section area of each subpanel should be deter-
mined by a reduction factor to account for local plate buckling. The stiffened
plate with effective
p
section areas for the stiffeners should be checked for
global plate buckling (by modeling it as an equivalent orthotropic plate)
and a reduction factor
r
should be determined for overall plate buckling.
The effective
p
area of the compression zone of the stiffened plate should
be taken as
A
c
,
eff
¼r
c
A
c
,
eff
,
loc
+
X
b
edge
,
eff
t
ð
3
:
55
Þ
where
A
c,eff,loc
is the effective
p
section areas of all the stiffeners and subpanels
that are fully or partially in the compression zone except the effective parts
supported by an adjacent plate element with the width
b
edge,eff
(see example
A
c
,
eff
,
loc
¼A
sl
,
eff
+
X
c
r
loc
b
c
,
loc
t
ð
3
:
56
Þ
where
P
c
applies to the part of the stiffened panel width that is in compres-
tive
p
sections of all longitudinal stiffeners with gross area
A
sl
located in the
compression zone,
b
c,loc
is the width of the compressed part of each subpa-
nel, and
r
loc
is the reduction factor for each subpanel. According to EC3
b
1
r
2
A
c,eff,loc
b
3,edge,eff
b
1,edge,eff
=
2
A
c
b
1
r
1
b
2
r
2
2
b
2
r
2
2
b
3
r
3
2
b
1
b
3
2
2
2
b
1
b
2
b
3
b
1
b
2
b
3
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