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Fatigue Equation for Cap Channel to Wide Flange Beam

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alumpkin

alumpkin

Structural
Joined
Sep 11, 2000
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Looking for guidance using Table A-3.1 in AISC manual for the fatigue equation for welding a cap channel to a wide flange beam. One option is continuous fillet welds and the other is intermittent fillet welds. It appears that for continuous fillet welds equation 3.1 is the correct one which has a stress limit of 16 ksi....but equation 3.4 for intermittent welds with a stress limit of 4.5 ksi....which seems really low.

Thanks for any insight.

Alan L. Lumpkin, MS, PE
Greenville, SC
 
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"fatigue equation for welding a cap channel to a wide flange beam......"

I think intermittent welds get a hefty de=rate or even simply are forbitten whenever fatigue is involved.
Each of the start/stops is a significant stress concentration and potential weld defect site.
 
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