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mobility or DoF of a statically indeterminate structure is always less than zero and also we can have negative value of mobility.
for checking this
we have to see the Gruebler's criterion , wher
D.F= 3(Movable link - 1) - 2*(number of Single D.F of kinematic pair) - ( number of two DF of kinetic pair)
therefore, according to definition of satatically indeterminate structure have zero movable link . hence D.F will be either zero or negative.
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