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Lloyd's Code for Lifting Appliances in a Marine Environment

Lloyd's Code for Lifting Appliances in a Marine Environment

Lloyd's Code for Lifting Appliances in a Marine Environment

(OP)
Hello. I would like your help with respect to :
Chapter 4 section 2 Paragraph 2.24.5 of the LATE.
There in case of loading of a flange which is connected to a main structure through a circularly patterned bolted joint states:



Can someone explain why it subtracts the load due to tension of each bold from the load due to bending moment?
In my opinion it (the term H/N) should be added for the most heavily loaded bolt!
I am trying to figure out the justification behind the formula as my organisation needs to design by that code.
By subtracting the tensile stress due to tension don't you underestimate the possible maximum load for the most heavily loaded bolt?

Thanks in advance

RE: Lloyd's Code for Lifting Appliances in a Marine Environment

Andreas

This calculation is for a crane slewing ring, so naturally the direct load is compressive. In the general case the sign would reverse if the load on the group is tensile.

David

RE: Lloyd's Code for Lifting Appliances in a Marine Environment

(OP)
Thank you very much

That was my thought too. It was sent to us by a subcontractor and the calculation didn't many any sense.
But nevertheless i needed to check before i make my report.

Thank you again

RE: Lloyd's Code for Lifting Appliances in a Marine Environment

D UK, when stating crane slewing ring are you referring to the turntable ring?

RE: Lloyd's Code for Lifting Appliances in a Marine Environment

Chicopee

Lloyd's refer to this specifically as the "slewing ring bolting" calculation, which I guess might also be called the turntable ring.

The calculation is derived by taking the bolts as distributed around their pcd and taking the tensile/compressive and bending on the resulting tube.

David

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