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Rivet Group Load Distribution

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Estimate direct and torsional shear per fastener for a circular rivet or bolt group.

count

Governing fastener shear

1,833.33 N

direct and moment components aligned

Direct shear

1,000.00 N

equal load share P / n

Moment shear

833.33 N

direct dominated case

Calculation breakdown

Orthogonal resultant1,301.71 N
Minimum vector shear166.67 N
Sum of radius squared0.05 m2
Load eccentricity0.06 m

Eccentric fastener group

Direct shear is shared equally; the eccentric moment adds tangential load that peaks on one side of the group.

1.83 kN peak

P = 8.00 kNM = 500.0 N mcentroidradius = 75.0 mm8 fastenerspeak fastener vector sumdirect + aligned moment1.83 kNFd = 1.00 kN, Fm = 0.83 kNmoment/direct = 0.83x

direct share

1.00 kN

same vertical component at each fastener

moment share

0.83 kN

tangential component from M r / sum r2

pattern stiffness term

0.0450 m2

sum of squared fastener radii

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