Length of Bearing (Web Crippling/Yielding) 1

[STRUCGB]

For Web yielding/crippling, the length of bearing N is suppose to considered where the load is applied, what is this variable exactly, where is it located?

Also to figure out whether the concentrated load is applied Interior or at Ends, the code refers to the distance from end of beam greater than the member depth. Is this distance from end of the beam looking at it sideways or its cross section?

 

[Den32]

Assuming you are looking at 13th Edition of AISC, Section J10.2 & J10.3?

- The value 'N' is the length of bearing. So, for example, a beam bearing on 8" CMU walls supporting a concentrated column load at it midspan: You would need to check the concentrated load at center (column load, where N = column bearing length in elevation view, or sideways view), as well as at beam end, where N = beam bearing length on CMU wall (this would be the elevation view length that the beam bears on the steel bearing plate).

'Distance from end of beam' is in elevation or 'sideways view'. Best way to see how the AISC formulas work is to download the AISC Examples PDF from

http://www.aisc.org.......there

are examples for many of the formulas which clarifies questions such as this.

 

[STRUCGB]

Basically,

Bearing N has to be looked in 2 cases:

1)The bearing of column (load) on beam - N is based on the thickness of column (ex. if W150X30 column, then N= 152, or if the column is supported by a plate on the beam, let's say a 200x200mm, then N=200)

2)The second case N at reactions, where the beam is being supported. So if the beam sits at both ends on a 300mm pile cap, then N= 300.

Is this correct?

Thanks for the reference website.

 

[Den32]

Correct, assuming it bears fully on the pile cap, then N=300mm.

Again, go download the AISC Examples PDF. It contains examples for almost all steel calcs in the Manual. Very useful in clearing up questions like this.

Good luck.