Combined Stress - Bending, Shear and Tension in Bolts
Combined Stress - Bending, Shear and Tension in Bolts
(OP)
Are there any references or suggestions for analyzing/designing a bolt subject to bending, shear and tension?
The bolts would be embedded in concrete/masonry and the applied load would be at a 'standoff' distance of around 4-6 inches just to give you some prospective on the situation.
The bolts would be embedded in concrete/masonry and the applied load would be at a 'standoff' distance of around 4-6 inches just to give you some prospective on the situation.
EIT
www.HowToEngineer.com






RE: Combined Stress - Bending, Shear and Tension in Bolts
RE: Combined Stress - Bending, Shear and Tension in Bolts
RE: Combined Stress - Bending, Shear and Tension in Bolts
I didn't realize this was in DG1, I'll have to take a look.
EIT
www.HowToEngineer.com
RE: Combined Stress - Bending, Shear and Tension in Bolts
EIT
www.HowToEngineer.com
RE: Combined Stress - Bending, Shear and Tension in Bolts
so total tension = tension from bending + tension from axial (how does preload affect this ?)
RE: Combined Stress - Bending, Shear and Tension in Bolts
RE: Combined Stress - Bending, Shear and Tension in Bolts
RE: Combined Stress - Bending, Shear and Tension in Bolts
The bolts would be subject to shear as well. Actually I would have shear in two directions, bending in two directions and axial tension.
I plan to use the force resultants for shear and bending. Apply all loads separately to find axial tension fa=T/A, shear stress fv=V/A (AISC DG1 uses no 'shape' increase in area) and bending tensile stress fb=M/Z.
Add fa+fb=ft
Use ft and fv in AISC equation for bolts subject to tension and shear. AISC Eqn: J3-3
EIT
www.HowToEngineer.com
RE: Combined Stress - Bending, Shear and Tension in Bolts
if the joint doesn't gap under ultimate load, then the load in the bolt will be higher than the applied tension.
my previous post picked up on the fact you have tension loads, and therefore i expected you'd be preloading the joint. if you do have a preload, and the joint is still closed up under load (ie not gapped) then the joint surfaces will be transferring the bulk of the loads (and not the bolt).
RE: Combined Stress - Bending, Shear and Tension in Bolts
EIT
www.HowToEngineer.com
RE: Combined Stress - Bending, Shear and Tension in Bolts
Generally speaking, a bolt should not be designed for taking bending loads. I am talking machinery where you will experience alternating loads. Thats why you need to ensure enough pre-load. When the bolted connection is separating and you have shear loads, you will get bending in the biolt. Also, remember that the max. stress from shear and the max stress from bending will not be at the same position in the bolt cross section.