Padeye Design 1

[zaxen]

I am designing a single padeye plate (no cheek plates) with a single shackle pin going through it. I am accouting for the two most likely modes of failure namely 1) Bearing = Fu x dia of hole x plate thickness 2) shear tearout = 0.4 Fy x Clear edge distance x plate thickness. Is this sufficient? Could anyone think of something else?

 

[JStephen]

Check into the ASME BTH design guide for below-the-hook devices. It includes design data for pinned connections. There are several different checks.

 

[MiketheEngineer]

You can buy these relatively cheaply at Grainger or McMaster-Carr??

 

[weab]

For shear tearout, you could multiply the area by 2. Be aware that AISC 9th edition, presumably 13th too, sets a limit on the allowable "clear edge distance. You also need to check weld of padeye to base material.

 

[zaxen]

weab - 1) where does the factor of 2 for shear tearout come from? 2) Is it because, the pin would, for lack of a better term "emanate out" two cracks from it's circumference out to the plate edge? 3) would this factor of 2 also apply in the case of a bolt and a beam web?

 

[DWHA]

JStephen is right. ASME Below the hook is the best reference I have found. Easy to follow, and very complete.

 

[zaxen]

Thank you all. I found AISC 14th edition now talks about pin-connections and eye bars as well. The equations are very similar to the ones in ASME BTH-1. My curiosity as to the failure mode is not completely satisfied but that's because, the ASME equations on pin connected joints are "empirical". However i did manage to find some papers that talk about a failure mode similar to the one i talk above. just a word of caution - don't use the empirical formulae (with 2t widths and 0.63 constant) in your beam web tearout calc

 

[desertfox]

Hi zaxen

I found this was quite useful in the past:-

http://www.google.co.uk/url?sa=t&rc...2KCpCA&usg=AFQjCNE2r9gfhmp_FKa0h1LpEjkmUu89GA

desertfox

 

[desertfox]

this also:-

http://www.scribd.com/doc/19258533/Design-of-lifting-lug