AISC Manual Single Shear Plate Connection: 13th ed vs 14th ed
AISC Manual Single Shear Plate Connection: 13th ed vs 14th ed
(OP)
Has anyone noticed that the 14th edition single shear plate tables have lower values than the 13th edition?
Example
13th edition: Table 10-9a, for 3-3/4" bolts in a 3/8" shear tab, the capacity is 47.7 kips
14th edition: Table 10-10a, for 3-3/4" bolts in a 3/8" shear tab, the capacity is 43.4 kips
What makes this exceptionally strange is that in the 13th edition, this connection is controlled by the bolt shear strength (i.e. 3x15.9 kips=47.7 kips) but the bolt shear strength in the 14th edition is 20% higher (due to the revision of the factor accounting for bolt group length).
Does anyone know the reason for the change in the tables?
Thanks
Example
13th edition: Table 10-9a, for 3-3/4" bolts in a 3/8" shear tab, the capacity is 47.7 kips
14th edition: Table 10-10a, for 3-3/4" bolts in a 3/8" shear tab, the capacity is 43.4 kips
What makes this exceptionally strange is that in the 13th edition, this connection is controlled by the bolt shear strength (i.e. 3x15.9 kips=47.7 kips) but the bolt shear strength in the 14th edition is 20% higher (due to the revision of the factor accounting for bolt group length).
Does anyone know the reason for the change in the tables?
Thanks






RE: AISC Manual Single Shear Plate Connection: 13th ed vs 14th ed
Therefore, the comparison should be between the Group B value (47.9kips) and the old 13th edition value.
RE: AISC Manual Single Shear Plate Connection: 13th ed vs 14th ed
I assumed it was the geometric arragnement of the bolt. But, it really is just trying to say A325 vs A490.
RE: AISC Manual Single Shear Plate Connection: 13th ed vs 14th ed
The 14th edition procedure removes the 20% bolt reduction. In order to keep the predicted capacities close to the tested capacities, the procedure also puts eccentricity on the bolt group. So the bolts got stronger, but the number of effective bolts decreased, so it's not surprising the two procedures give slightly different values.
RE: AISC Manual Single Shear Plate Connection: 13th ed vs 14th ed
If I add 1/8" to the eccentricity, that is e=1.625", then C=2.42, and the bolt capacity is 43.3 kips. This is within round-off error of 43.4 kips.
When I check the values for 3 bolts through 7 bolts, I get the tabulated value with e=1.625", and a different value for e=1.5". (For 8 bolts and higher, the values don't vary beyond three significant digits.)
Does anybody know why this is happening? Did the tables assume an additional 1/8" eccentricity for some reason? Were they actually calculated using an a equal to 3.25"?
RE: AISC Manual Single Shear Plate Connection: 13th ed vs 14th ed
I see where they added the requirement to consider the eccentricity (Table 10-9). It would appear that they need to alter the eccentricity a little so the capacities in the tables between the 13th ed and the 14th ed match for the smaller bolt sizes. .
They match for larger bolt sizes, but don't match for the smaller bolt sizes. The difference for the aforementioned connection is 10%, which, while not gigantic, isn't insignificant.
Have you seen any AISC sources that talk about this particular change? I've seen several for the bolt capacity change and one for the change to the extended shear plate, but not for the change in the single shear plate proceedure.
RE: AISC Manual Single Shear Plate Connection: 13th ed vs 14th ed