This may seem a bit counter-intuitive, but the best
place to drill holes
in stiffeners, if one must, is actually through
the stiffener web.
Stiffeners work by increasing the local moment of
inertia in
consideration of the stiffener plus an effective length of
the shell to
which it is welded. The outstand (stiffener flange)
actually makes the
greatest contribution to this moment, as compared to
material within the
web which is close to the neutral axis of the
combined section. Small
holes are unlikely to make a huge
difference, but assuming you have a T
shaped stiffener, is it possible
to clamp to the flange without drilling
at
all?
-Sean
On 2012-05-28 02:49, James Frankland
wrote:
Hi All,
Am i ok to drill holes in my
reinforcement ribs? They would be about
8mm in the top part of
the "T". Just a few here and there to hold pipes.
I've
finished most of the high pressure plumbing but i need to hold
the
pipes down. I didnt really want to drill into the ribs as
it
means more painting, but ive scraped the paint off in places
while
working so i have to re-do bits anyway.
The other
options are to weld tabs on, or use some brackets of some
sort, but i
think easiest is just to bolt through and re
paint.
Thanks
James
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