Seismic Weld Demand Ratio Calculator

Calculate seismic demand ratios for welded connections per AISC 341 Seismic Provisions including expected yield stress and strain hardening

Input Parameters

Results

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Probable Moment (Mpr)
kip-ft
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Flange Demand Force
kips
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CJP Weld Demand Stress
ksi
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Demand/Capacity Ratio
Note: Per AISC 341 for Special/Intermediate Moment Frames. Demand critical welds at beam flanges require notch-tough filler metal. Ry=1.1 for A992/A572 Gr. 50 steel.

Reference

AISC 341 Seismic Provisions: Mpr = Cpr * Ry * Fy * Zx (probable plastic moment) Cpr = (Fy + Fu)/(2*Fy) <= 1.2 (strain hardening) Ry = ratio of expected to specified yield (1.1 for A992) Demand critical welds require CVN toughness: 20 ft-lb at -20F E70T-6 or E71T-8 filler metals typically required