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WeldGroup - eccentrically loaded weld group shear capacity

The WeldGroup spreadsheet calculates resistance of a weld group subjected to eccentric forces. It offers plastic and elastic methods of analysis in accordance with the AISC Manual.
Plastic analysis is used only for fillet welds loaded in the plane of a faying surface. It takes advantage of the higher strength of the welds loaded at an angle. For transversely loaded welds it accounts for a 50 percent increase in weld strength over a longitudinally loaded weld. For eccentrically loaded weld groups, plastic analysis uses Instantaneous Center of Rotation Method which is more economical and consistent with the test results than the elastic method. Plastic analysis can also be used for a group of parallel linear welds loaded not in the plane of faying surface. This condition is defined as a Special Case in Table 8-4 of the AISC Manual. The shear capacity is found as the resistance of a single weld (loaded in the plane) times the number of welds in the group. The design by WeldGroup spreadsheet shall be similar; implemented plastic analysis does not use out-of-plane forces.
Elastic analysis is used to analyze weld groups loaded either in the plane or normal to the plane of a faying surface. The stress vectors in three directions are calculated using a conventional approach and then summed geometrically. Elastic analysis can be used for fillet and PJP welds.

The spreadsheet provides design summary, detailed results, and fundamental theory and formulas.


Weld generator

WeldGroup design worksheet

Design worksheet

WeldGroup design worksheet

Theory worksheet

WeldGroup theory worksheet


In order to use WeldGroup two actions need to be performed first: