Where tM in the lower part of side frames, as
defined in figure 1, is
equal to, or less than, tCOAT, shear strength check shall
be carried out in accordance with the following.
The thickness tREN,S, in mm, is the maximum between
the thicknesses tREN,Sa and tREN,Sb obtained
from the shear strength check at sections a) and b) (see figure 2 and 3.1) given by the
following, but need not be taken in excess of 0.75tS12.
-
.1 at section a): 
-
.2 at section b): 
where:
|
ks
|
= |
shear
force distribution factor, to be taken equal to 0.6 |
|
Pfr,a, Pfr,b
|
= |
pressure forces defined in 3.1.1 |
|
da, db
|
= |
bracket and frame web depth, in mm, at sections a) and b), respectively
(see figure 2); in case
of separate (non integral) brackets, db shall be taken
as the minimum web depth deducting possible scallops
|
|
φ |
= |
angle between
frame web and shell plate |
|
τa
|
= |
allowable
shear stress, in N/mm2, defined in 3.2.
|