Structural steel - slotted pipe (round HSS) end tab
Structural steel - slotted pipe (round HSS) end tab
(OP)
Consider a structural steel pipe 3" diameter to 8" diameter, with slotted pipe end tab connections. Also termed knife-plate connection, where the end of the pipe is slotted. For instance, say 9/16" wide x 6" deep slot in the end of a 5.563" pipe to accept a 1/2" x 7" wide plate, which is welded with (4) fillet lines.
The new AISC specification classifies this as Case 5 in Table D3.1.
The code infers, but does not explicitly require the length of the slot to be at least as long as the diameter of the pipe. That is, Lw >= D.
Is it a code violation to use Lw = slot length = weld length = (0.85)D? Is it a bad idea? For the connection in question, the axial demand on the connection is a little less than 25% of the axial strength (phi-Pn) in tension.
I would just use a shear lag factor = 0.6 to penalize the connection since the member slenderness controls the design (not the connection strength).
The new AISC specification classifies this as Case 5 in Table D3.1.
The code infers, but does not explicitly require the length of the slot to be at least as long as the diameter of the pipe. That is, Lw >= D.
Is it a code violation to use Lw = slot length = weld length = (0.85)D? Is it a bad idea? For the connection in question, the axial demand on the connection is a little less than 25% of the axial strength (phi-Pn) in tension.
I would just use a shear lag factor = 0.6 to penalize the connection since the member slenderness controls the design (not the connection strength).






RE: Structural steel - slotted pipe (round HSS) end tab
http://www.FerrellEngineering.com
RE: Structural steel - slotted pipe (round HSS) end tab
The original post asks about using weld lengths less than the diameter. I wouldn't have a problem doing this, as long as the U (equal to xbar/L) is calculated accordingly.
RE: Structural steel - slotted pipe (round HSS) end tab
But, you can calculated U as shown in the table.
http://www.FerrellEngineering.com
RE: Structural steel - slotted pipe (round HSS) end tab
Thanks for the pdf posting. However, it looks like page 138 - which probably includes the Conclusion - is missing. If you could re-send with the Conclusion page, that would be sweet.
RE: Structural steel - slotted pipe (round HSS) end tab
http://www.FerrellEngineering.com