Stress calculation of the support base plate under the pull force of anchor bolts or screws
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How do you carry out the stress calculation of the support base plate under the pull force of anchor bolts or screws? The manual contains only the calculation formulas for stress on plates, but no calculations for stresses due to concentrated forces.
I didn’t understand. In terms of load-bearing or vertical loads, the strength of the usual supports is sufficient.
If the overturning moment is relatively large, there is a bolt pull-out force; in this case, the bottom plate on the side subjected to pull-out will experience the tensile force from the bolts. Since the contact area between the nut and the bottom plate is small, I think it is necessary to verify this area.
It must be able to withstand the bending moment generated by the bolt tension in the thickness direction
That’s exactly what I mean, but there’s no such calculation formula
Be lazy and just check that the maximum tensile force on the bolt generates a bending moment at the junction of the bottom plate and the vertical plate: lol
Stress also needs to be calculated, and deformation as well – is finite element analysis the only option? Why doesn’t the specification explain this situation?
For steel structural tension columns, the thickness δ of the bottom plate should be ≥ (6 * T_single_bolt * cantilever_length / (calculated_width b) / f)^0.5. This value is derived from the formula for the cantilever beam: W = b * δ^2/6 = Mmax/f = T_single_bolt * tension_force * cantilever_length / f. For ear-type supports, the thickness δ of the tension-bearing bottom plate should be ≥ (6 * T_single_bolt * spacing_between_reinforcement_plates / (bottom_plate_width b) / f/4)^0.5. For simply supported beams subjected to concentrated forces, W = b * δ^2/6 = Mmax/f = T_single_bolt * tension_force * spacing_between_reinforcement_plates / f/4. The value of f is 215 MPa; units are unified as N/mm