1. Eccentric Shear Welded Connections
Eccentric shear welded connection are popular for column brackets supporting gantry crane loadings or mezzanine floors. The connection below produces (shear + torsion) on the weld. The LRFD method for (shear + torsion) is both difficult and lengthy, A more conservative “elastic vector analysis” method is allowed by AISC:
W-29

2. Elastic Vector Analysis
The eccentric load is transferred to the “centroid” of the weld group. The transferred load shall consist of a load plus a moment (Mz = P·e), where:
e = eccentrity.
The actual weld thickness resisting shear and torsion forces is (0.707w), but for simplicity, we consider effective throat
thickness = 1.0 inch.
From direct shear only (due to P):-
1 inch Py Px P
M=P·e
W-30

3. Elastic Vector Analysis
The transferred moment (M) causes additional shear stresses depending on the critical locations of the weld (far edges of the weld).
where:
M = moment due to eccentricity = (P.e)
d = distance to far this weld point
J = Polar moment of inertia.
where:
This can be vector analyzed to:
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4. Elastic Vector Analysis
Once these four stress components are evaluated for an
extreme point of the weld. They can be added vectorially:
Then the strength of 1 inch wide weld is evaluated as:
Fv =  w x 1 x (0.6 FEXX)
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5. Eccentric Shear Connection
Example W-6
Determine the size of the weld required
for the bracket shown. A-36 steel is
used, SMAW process?
Solution:
W-33

6. Eccentric Shear Connection
Example (W-6) - Continued
By inspection points (A $ B) are more critical than points (B & C);
Take point (A):
W-34

7. Eccentric Shear Connection
Example (W-6) - Continued
Select E70XX as given by matching table.
Use ½ inch weld size
W-35