AISC- coped beam checks
AISC- coped beam checks
(OP)
I have several standard W shapes that are part of a composite floor system, and the beams framing into the girders are being coped at the top flange mostly, but some at both top and bottom. I am not the EOR only the specialty engineer in this case. The connections are simple bolted shear connections.
I am working my way through the different coped beam checks and I am a little confused by the section on pgs 9-18,19 (13th ed black book) that deals with local web yielding and web crippling.
Specifically, the terms:
N- bearing length: what does this mean exactly for a coped beam and a bolted shear connection?
This N term is also used in Table 9-4, far RHS column, and at the top of the table it says (N=3-1/4), further confused.
x- distance at which compressive force is applied. Is this the compressive force resultant from the shear at the connection via a couple, in the top flange or along the cope?
I have searched through AISC, the commentary, etc. and not gotten any clarification, but maybe I have not looked in the right area. I am not sure why they didn't do a diagram/sketch for this check like they did for the others.
Anyone willing to post a sketch with these constants labeled or otherwise clarify this? Thanks!
I am working my way through the different coped beam checks and I am a little confused by the section on pgs 9-18,19 (13th ed black book) that deals with local web yielding and web crippling.
Specifically, the terms:
N- bearing length: what does this mean exactly for a coped beam and a bolted shear connection?
This N term is also used in Table 9-4, far RHS column, and at the top of the table it says (N=3-1/4), further confused.
x- distance at which compressive force is applied. Is this the compressive force resultant from the shear at the connection via a couple, in the top flange or along the cope?
I have searched through AISC, the commentary, etc. and not gotten any clarification, but maybe I have not looked in the right area. I am not sure why they didn't do a diagram/sketch for this check like they did for the others.
Anyone willing to post a sketch with these constants labeled or otherwise clarify this? Thanks!






RE: AISC- coped beam checks
RE: AISC- coped beam checks
So does that mean with a bolted shear connection I do not have to check for local web yielding and web crippling?
I did all of the other checks... This would make sense to me anyway, block shear should control.
RE: AISC- coped beam checks
RE: AISC- coped beam checks
RE: AISC- coped beam checks
RE: AISC- coped beam checks
RE: AISC- coped beam checks
The local web yielding and web crippling will apply if there is a concentrated force applied to the top flange of the beam or when the beam bottom flange is bearing on another surface.
The sketch I recall having comes from Salmon and Johnson. I've attached the applicable pages.
RE: AISC- coped beam checks
Thanks guys, I followed along with all the other checks, but I was thinking maybe that only applied to a bearing connection or a concentrated load condition.