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<div class="moz-cite-prefix"><br>
Probably time to seek clarification from ABS. Do you have a
contact there; do you want me to find you one?<br>
Jon<br>
<br>
<br>
On 4/25/2015 3:11 PM, Sean T. Stevenson via Personal_Submersibles
wrote:<br>
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<div class="moz-cite-prefix">Jon - that was my original thinking,
but then I noticed that the second term in the Pn equation in
6/19.13 contains the L term, or distance between non-heavy
stiffeners, leading me to believe that this second term might be
a correction factor for stiffness of the reinforced shell in
between the heavy stiffeners, in which case it would make sense
that the I term is the non-heavy I. Conceptually this makes
sense because the section is dealing with overall buckling
across the length between heavy stiffeners, which is resisted by
the mechanical properties of the shell reinforced with non-heavy
stiffeners. Only the mention of heavy stiffeners as the
limiting extents of the collapse led me to originally assume the
heavy I, which I am now unsure of.<br>
<br>
Sean<br>
<br>
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