Show Calculated Rod Effective Area for CSHEAR

[brianabreugomes]

Hi guys...need a little help in understanding something here.

I am using CSHEAR's to model some spar & rib webs. I have rib caps and spar caps modeled. But I have no stiffeners in the vertical direction so I am putting in F1 or F2 values to take the vertical direction loads.

I am using F2 = 30.0.
Thickness is 0.040".
Vertical Lengths (Z Direction) of panels are 1.063" and Longitudinal Lengths (X & Y Direction) are 5".

Nastran is stating that my effective area for F2 is larger than my actual area. I want to know what the effective area nastran is calculating. Isn't my rod area going to be A = (0.5)(30.0)(0.040)^2 = 0.024 in^2

I don't get it.

Thanks in advance.
-B