Civil Engineering Reference
In-Depth Information
Figure 10.5
Equivalent panels and loads (after CIRIA (1977))
using the CIRIA GuideÓs interaction diagrams to give modified
critical stresses
N
vcr
in the vertical direction and
N
hcr
in the
horizontal direction in terms of
EI
Ó, where
EI
Ó is the flexural
stiffness of the equivalent panel.
Step 5:
Determination of effective heights
h
e
and lengths
L
e
.
The effective heights and lengths are determined from the following
formulae.
(10.1a)
(10.1b)
where
N
vcr
and
N
hcr
are the modified critical stresses determined in
Step 4.
Step 6:
Design of vertical and horizontal column strips.
The vertical and horizontal strips of unit width are then designed as
slender columns (Wong and Kong, 1986; Kong and Wong, 1988), as
if they were subjected to the
equivalent
axial stresses
N
v
and
N
h
respectively (see Step 3 above).
