lewilder
Structural
- Feb 1, 2017
- 2
Hi all,
Looking to untangle a discrepancy in example 4.1 of AISC Design Guide 24, Beam over HSS Column Connection. Another engineer tripped over it in 2015, apparently without resolution -- thread507-401175 -- and I see no reference to the issue in the published errata.
Toward the end of the design example, we read: "Assuming a 45 degree maximum load dispersion angle, the weld of the cap plate to the HSS can be checked by evaluating a load per inch of the lesser of Tr/g or Tr/(db +2b), where b is the distance from the bolt center to the face of the HSS." Bold-face emphases are mine, throughout this post.
Skipping a few lines, the example goes on: "Determine the greater of Tr/g or Tr/db+2b):"
At this point the LRFD example marches down the left side of the page, using the maximum, Tu/g, to determine the weld size.
Meanwhile the ASD example veers to the right, declaring it will use Ta/(db+2b), which is the minimum value, for weld size determination.
I'm new enough to this kind of design that I can only guess that we should be addressing the larger of these two line loads. Can anyone verify? Or is this a case where I should try pinging the authors? My thanks to everyone on this forum, by the way; I've come here many times to find my questions already answered.
Looking to untangle a discrepancy in example 4.1 of AISC Design Guide 24, Beam over HSS Column Connection. Another engineer tripped over it in 2015, apparently without resolution -- thread507-401175 -- and I see no reference to the issue in the published errata.
Toward the end of the design example, we read: "Assuming a 45 degree maximum load dispersion angle, the weld of the cap plate to the HSS can be checked by evaluating a load per inch of the lesser of Tr/g or Tr/(db +2b), where b is the distance from the bolt center to the face of the HSS." Bold-face emphases are mine, throughout this post.
Skipping a few lines, the example goes on: "Determine the greater of Tr/g or Tr/db+2b):"
At this point the LRFD example marches down the left side of the page, using the maximum, Tu/g, to determine the weld size.
Meanwhile the ASD example veers to the right, declaring it will use Ta/(db+2b), which is the minimum value, for weld size determination.
I'm new enough to this kind of design that I can only guess that we should be addressing the larger of these two line loads. Can anyone verify? Or is this a case where I should try pinging the authors? My thanks to everyone on this forum, by the way; I've come here many times to find my questions already answered.
