All phases degrees of freedom
δis a random value of small displacement.
hc is the height distance between points A and B before any loads are applied.
uc is the necessary deflection of point A for point B to touch the floor.
It is calculated by solving phase 1.
hs is the height distance between points A and C before any loads are applied.
e is the difference between the free length and the solid length of the spring.
– means the displacement is unknown and the corresponding load is null.
0 means the displacement is blocked (see Fig. 9).
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