Confusion with bolted connection
Confusion with bolted connection
(OP)
See the attachment for loading scenario. The drawing is a simple beam with fixed supports via 2 bolts at each end. Am I correct in distributing the load, F, to each of the 4 bolts as a vertical reaction force of F/4? Is there an additional shear force caused by the moment about the center of the 2 bolts at A and at B as you would see in a cantilevered bolted connection? Or does the beam take up this moment and the bolts only see the vertical load? Thanks for the help!





RE: Confusion with bolted connection
yes, there'd be some sheardue to moment couples at the ends. The maximum end moment would be for the fully fixed case, VL/8, so the shear would be VL/8H.
Quando Omni Flunkus Moritati
RE: Confusion with bolted connection
RE: Confusion with bolted connection
Quando Omni Flunkus Moritati
RE: Confusion with bolted connection
RE: Confusion with bolted connection
take moments about one bolt ... M = P*H; or take moments about the middle ... M = P*H/2+(-P)*(-H/2) = P*H
Quando Omni Flunkus Moritati
RE: Confusion with bolted connection
RE: Confusion with bolted connection
Quando Omni Flunkus Moritati
RE: Confusion with bolted connection
RE: Confusion with bolted connection
RE: Confusion with bolted connection
Quando Omni Flunkus Moritati
RE: Confusion with bolted connection
RE: Confusion with bolted connection
Have Fun!
James A. Pike
www.xl4sim.com
www.erieztechnologies.com
RE: Confusion with bolted connection
With a fastener pattern loaded in shear you might assume the fasteners have proper shear fits, and you would probably ignore the effects of friction. But if the fasteners have clearance fits, then you might assume the fasteners initially do not equally share the loads. And sometimes in certain applications the fasteners are designed to transfer all of the shear force through clamped friction produced by fastener preload. If the fasteners have clearance fits and are loaded in single shear, then bearing stress at the hole edges might also be a concern.
The analysis can be as simple or complex as the situation dictates. But simplified analysis approaches usually require more conservative factors of safety. The person asking the question mentioned that the analysis case they are actually considering is more complicated than what is shown in the sketch. So it might be helpful if more details were provided of the analysis requirements.