AISC Fillet Encroachment
AISC Fillet Encroachment
(OP)
All,
Can I frame a beam (tw = 3/8") into a column (W8x31) at its web using a double clip (2)-L4x3x5/16 (Long Leg Back-to-Back) with the use of Figure 10-4, LRFD Third Edition or Figure 10-3, Thirteenth Edition? According to this figure k=6.125", tf=0.435, Kdet - tf = 0.69 thus Encr. = 1/4". This leaves me with k+2(Encr)=6.625". Any thoughts?
TIA
Can I frame a beam (tw = 3/8") into a column (W8x31) at its web using a double clip (2)-L4x3x5/16 (Long Leg Back-to-Back) with the use of Figure 10-4, LRFD Third Edition or Figure 10-3, Thirteenth Edition? According to this figure k=6.125", tf=0.435, Kdet - tf = 0.69 thus Encr. = 1/4". This leaves me with k+2(Encr)=6.625". Any thoughts?
TIA






RE: AISC Fillet Encroachment
The 6.125" dimension that you call "k" seems to be a misnomer. It's closer to a T dimension, but that's the T dimension for the W8x28 and W8x24, not the 31.
The quick way to do this stackup is to add 6" (2-3" angle flanges) to your tw of the beam coming in. In your case this would be 6 3/8". Then compare that to the T dimension for the column you're framing into. The T for a W8x31 is 5 3/4", so it won't fit. Note that it also will not fit in a W8x28 or W8x24 either.
RE: AISC Fillet Encroachment
RE: AISC Fillet Encroachment
I was not taking advantage of what's called "riding the fillet". You do indeed get an extra 1/2" of space for this member bringing you up to 6.25" of room which is just enough for your clips and a 1/4" web. Also, you can get a larger web with the same angle clips into the W8x28 and W8x24 as you stated.
RE: AISC Fillet Encroachment