Prying - tmin

[engrclar]

Hi,

New to this so hopefully I've posted in the correct area.

In the 14th edition of the AISC's Steel Construction Manual, section 9-10 (connections) gives a formula which allows you to calculate the minimum plate thickness required to eliminate prying (tmin).

The formula uses the ultimate plate/element strength (Fu) rather than the yield strength (Fy). Is this correct or is it a typo?

All other variations of this tmin formula I can find uses Fy and not Fu as stated in the latest edition. Not too sure if this is due to changes in the Specification from 360-05 to 360-10?

Any views would be greatly appreciated.

Cheers,

Bob

 

[Ron]

You'll probably get more response to this in the AISC Code Issues forum or the Structural Engineering Other Topics forum.

 

[wannabeSE]

In the first paragraph of text in the prying action section on page 9-10 of the 14th edition, it states:
"The following discussion of prying action is similar to what has been considered prior to the 13th Edition Steel Construction Manual, except that the design is based on Fu, which provides better correlation with available test data than previous design methods."

 

[engrclar]

Hmmmm. How embarrassing. Cheers wannabeSE. English engineer here having to work to work to American codes as they are standard in the UK offshore industry!

 

[TLycan]

refer to the paper "A Yield Line Component Method for Bolted Flange Connections" it states"
"Although the Manual procedure uses the ultimate tensile strength, Fu, for prying calculations, which was first suggested
by Douty and McGuire (1965) and more recently byThornton (1992), yield line analysis has traditionally utilized
the yield strength, Fy."