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Author Topic: Pressure on stiffened panels  (Read 4454 times)


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Pressure on stiffened panels
« on: August 24, 2012, 10:32:00 AM »
On the FBD tab, it appears that pressure does not get the factor of safety applied to it where the in-plane loads do.  So, in-plane loads need to be entered as limit loads and pressure needs to be entered as ultimate (if this is true it is bad form).  Can anyone confirm this?  Also, from the various diagrams of the panels including the one which shows a coordinate system with z pointing outward, one would think that a positive pressure would be a bursting pressure.  This is not the case.  You have to make the pressure negative for a bursting pressure.  Can anyone confirm this?  By the way I am using v 5.8.11.  If these things have not been changed in a newer version I think a note should be added warning users of both potentially confusing issues.


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Re: Pressure on stiffened panels
« Reply #1 on: August 30, 2012, 06:34:45 PM »
The applied pressure is factored by the corresponding load factor. I tested this in v5.8.11 and the latest v6.2 and it is working properly. You may do a quick test to verify. Allow an ultimate analysis to control (lowest margin) then the bending moments and shear loads displayed in the super-imposed loads frame will correspond to Ultimate Load Factor*Applied Pressure.

The direction of positive and negative pressures are indicated by the figure on the FBD tab. Positive pressure is in the direction of positive Z.