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Design of duct plate

Design of duct plate

Design of duct plate

(OP)
I need to design a duct plate which is subjected to a internal pressure of about 500mmWC.

while doing the plate design as per roarks formula, i found diffcult in choosing which end condition to be used

for expample, if i want to design a duct plate of 2500X3000mm x 5 thk subjected to internal pressure of 500mmWc.
and the plate is stitch welded on all four edges to a primary structural members.

The end condition i considered is fixed on all four edges for finding the spzcing of stiffener in the plate.I don't know whether it is to be considered as simply supported?

But since the stiffener are used to break the size of plate, the design of plate inbetween stiffeners are to be considered simply supported or fixed end condition?

Please calrify.

thanks




RE: Design of duct plate

Only my thought: I think the stitch ends can be considered fixed end. The stiffener end, you need to have sufficient section modulus of the stiffener so you can consider it as fixed end. Section VIII Div. 1 Appendix 13 has rectangular duct design. You can use that. It will check stiffener spacing and size. It is compliacte, use commercial program is the way to go.
since you have 4 coners stitch welded to structures, which provide more reinforcement than code, so by using code formula, it will give you a very conservative design.(may be too conservative)
Some pressure vessel handbooks, such as Megsey, has design formula for reactangular vertical tank with liquid.



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