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UG-29 - Stiffening ring - lateral buckling

UG-29 - Stiffening ring - lateral buckling

(OP)
Hi,

In BPVC Section VIII, Div-1, Subsection UG 29 on stiffening ring, there is a paragraph that says "CAUTION: Stiffening rings may be subject to lateral buckling. This should be considered in addition to the requirements for Is and I's [see U-2(g)]". How is lateral buckling generally analyzed for stiffening ring or not analyzed based on certain engineering judgment?


Thanks,
Monk

RE: UG-29 - Stiffening ring - lateral buckling

See Code Case 2286.

Regards
r6155

RE: UG-29 - Stiffening ring - lateral buckling

Engineering judgment: for plate type ring, width not to exceed 10 times of ring thickness, not to exceed 8 times is preferred. This rule applied and not heard of any problem so far.

RE: UG-29 - Stiffening ring - lateral buckling

@ jtseng123
Please, can you tell us the literature?

Regards
r6155

RE: UG-29 - Stiffening ring - lateral buckling

(OP)
Thanks for all the reply!

FYI, after some more digging, check out page 11 of this literature that I found online that provides a width to depth ratio of the ring section based on the Young's modulus and yield of material.
https://pveng.com/wp-content/uploads/2016/06/Exter...

The equation used in the above literature is based on theory of compact vs non compact sections. Here is a link for brief explanation: http://www.wikiengineer.com/Structural/SteelBeamCo...

ASME BPVC 2286 Figure 1.4.4. has the same information as guide for width to depth ratio. That case number has a lot of information and I am still slowly trying to digest everything.

Regards,
Monk

RE: UG-29 - Stiffening ring - lateral buckling

@r6155, that is quick and dirty rule of thumb for decades. Handbooks or company spec may have that.

RE: UG-29 - Stiffening ring - lateral buckling

More literature
1) PD 5500
2) AD 2000
3) BS EN 13445

Regards
r6155

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