(a)
(b)
(c)
(d)
Figure 3: Time histories of forces acting on plane support plate pin shafts. (a) Force along the direction on the left plane support plate pin shaft, (b) force along the direction on the left plane support plate pin shaft, (c) force along the direction on the right plane support plate pin shaft, and (d) force along the direction on the right plane support plate pin shaft.