Frequently made mistakes#
1.1 Determine the normal force in bar \(\rm{CD}\) and \(\rm{AC}\)#
No free-body diagrams#
‘Incorrect’ free-body diagrams#
Missing forces in free-body diagrams#
Incorrect free-body diagrams#
Resultant / Equilibrium#
Missing equilibrium equations#
1.2 Determine the displacement of node \(\rm{C}\)#
Trying to use forget-me-nots#
Incorrectly calculated resultant displacement#
2.1 Determinate the support reaction at \(\rm{D}\)#
FBD and supports#
Similar to 1.1
Incorrect FBD of part of structure#
Starting with V-line#
2.2 Determinate the bending moment in \(\rm{C}\) using virtual work#
No virtual work#
2.3 Draw the bending moment diagram#
Bending moment diagram doesn’t match loads#
2.4 Draw the shear stress distribution just left of \(\rm{C}\)#
Wrong formula for \(\tau\)#
2.5 Determine the displacement at \(\rm{S}_2\)#
2.6 Sketch the displaced structure without values#
