(1) The total axial stiffness (K) of a tether is
1/K = 1/K_f + 1/K_s + 1/K_t
where K_f is the axial stiffness at the fixed point (bounday condition at the fixed point), K_s is the axial stiffness at the structure attachment point, K_t is the tether axial stiffness of EA/L.
(2) The axial stiffness values at two boundaries could be the same.
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