Structural Analysis
The degree of static indeterminacy of a pin-jointed space frame is given by (where m is number of unknown member forces, r is unknown reaction components and j is number of joints)

m + r – 3j
m + r + 3j
m + r – 2j
3m + r – 3j

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Structural Analysis
The minimum horizontal distance between two parallel main reinforcing bars, is

5 mm more than nominal maximum size of the coarse aggregate
The diameter of the longer bar if their diameters are unequal
The diameter of the bar if their diameters are same
Greatest value of the above

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