A bolt pattern has 4 bolts which must carry a total shear load of 31kN. Assume a coefficient of friction between the members of 0.15 for steel/steel....

A bolt pattern has 4 bolts which must carry a total shear load of 31kN. Assume a coefficient of friction between the members of 0.15 for steel/steel.

what is the required minimum preloiad per bolt to eliminate shear loads being carried by the bolts?