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To RPstress and Miner89r, Firstly, I would like to thank you gentlemen. I know the documents that you said and unfortunately there is no information about web with flanged holes in these resources. To 40818, I hope you can find the report that you told us.

GBor, Thank you so much your concern. I will use this option after that.

rb1957 (Aerospace) 7 May 08 17:47 but like the paper says ... webs with holes under compression ... not the interaction you were looking for Some method says that web can carry the only shear forces and inner and outer caps can carry only axial forces and bending moments. I have added this...

I have found a good document about our topic as attached. Is anyone having this kind of document in aircraft industry? Thanks for your helphttp://files.engineering.com/getfile.aspx?folder=7df75656-6aa3-40b5-958d-c2434dc456e5&file=Elastic_Buckling_of_Plates_with_Hole.doc

MNLiaison (Aerospace) 6 May 08 23:18 Check out the following document, NACA WR-L-402, "The Strength and Stiffness of shear webs with and without lightening holes". Tests were performed on holes with no edge reinforcement, flanged reinforcement and beaded reinforcement and the effects of can...

When I did some stability comparison (using FEM) the web with a flanged hole and a plain web under pure compression. The results are changing depends on flange stiffness (at hole edge).

First of all, I would like to thank you for your reply. I know these two options, but especially for the second one how can you decide a flanged hole is more effective than plain web. This is the main question for me.

Hello, to All, Question: How can I solve the stability of the frame webs with flanged holes under combined loading (Shear + Bending + Compression)? Is there any hand calculation method for this problem? Thanks,