Section VIII-I Appendix 1-7(b) 2

[PVGuy]

I am designing a large opening in a large vessel. The design requires App. 1-7(b) calculations. The opening passes reinforcement calculations easily. It is failing 1-7(b) though. The use of a pad is not available but gussets can be used. Dos anyone know how to take advantage of the added stiffness that the gussets will provide when looking at 1-7(b)? If not, does anyone know of an accepted method to be used in lieu of 1-7(b)?

 

[codeeng]

You can't take advantage of the gussets but you can for a flange per Fig 1-7-2, if you have one. Why can't you add a pad?

 

[PVGuy]

Their are several issues but what it really comes down to is it is not a point of flexibility with the customer. But never the less, the calculation has to be met somehow. Thanks for your reply.

 

[codeeng]

If your customer doesn't like pads you can use an insert plate in the shell (locally thickened portion). This is very common to satisfy integral reinforcement.

 

[TomBarsh]

Or try increasing the thickness of the neck. This will give you the most bang for the buck since it will increase the moment of inertia more readily.

 

[PVGuy]

Thank you both for your suggestions. I will incorporate this.