how to determine the number of stiffener according to the spacing span.

[orchidworld]

Dear James,

there is a question about the number of stiffener.

For example:
a T stiffened panel: 500*480(x span*y span), the optimization spacing span is 190,
so how to determine the position and the number of the stiffeners?

the number is 2 or 3??
what is the main principle?
thanks
OW

[James]

OW,

For a smeared component, the assumption is that the stiffeners are evenly spaced based along the Y span. So if your Y span is 480in and the optimum spacing is 190in, then the number of stiffeners is... 480/190 = 3 (rounded up from 2.5). The idea is the spacing should not exceed 190in anywhere in the panel which is usually driven by the local buckling criteria. Usually, you would create a discrete FEM to perform detailed sizing of the skin and stringers, based on one of the following modeling techniques:
http://hypersizer.com/help/#Components/Discrete/dp-mtech-about.php%3FTocPath%3DFeatures%7CComponents%7CStringer%2520Segments%7CModeling%2520Techniques%7C_____1

-James