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Issue with HSB26101-01, D 99

Issue with HSB26101-01, D 99

Issue with HSB26101-01, D 99

Hi all!

I am doing some lug analyses per HSB26101-01. I have two versions available; the D of 1999 and the E of 2006. The former is using a correction factor that depends on the load angle, psi (eq 3-7), which was substituted on version E with a constant value (0.84). That is my understanding at least.. Nothing is said about the removal of that factor and on the issue D that is featuring it, it simply states that it was added to make the calculation correlate better with tests. I got two issues with having it in my calcs.

First of all, it can assume values bigger than 1.0 for loading angles phi: 28.5° < phi < 61.4°. I understand that it is not (necessarily) a knockdown factor so it does not have to be < 1.0 but I do not feel very comfortable allowing it to raise my allowables.

And finally, the behavior it adds to the allowable is counter-intuitive.. I would expect a Lug to operate optimally for a loading angle phi = 0 but with the psi factor, the allowable is at its peak for phi = 45° which I find weird.

Any comments would be appreciated.

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