A beam is welded to a plate that is bolted to a wall using 2 identical bolts. A 10 kN force F is applied on the end of the beam, and the bolts are SAE class 8.8 steel bolts, with a FOS of 3. Determine the required bolt size if:
a) Shear is carried completely by friction between the plate and wall (i.e. there is only axial load on the bolts).
b) Shear is carried completely by the bolts (i.e. there is both axial and direct shear load on the bolts).
All pertinent dimensions are shown in Figure 2. Note, there is no torsion on the bolt group in this circumstance, only axial from the bending and direct shear down.
Figure 1: Schematic of the beam arrangement.
Figure 2: Side view of the arrangement with dimensions (not drawn to scale).