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)

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

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Structural Analysis
The effective length of lacing is the distance

0.7 of the distance between the inner end rivets of the bar for double lacing
All of these
Between the inner ends of effective lengths of welds connecting the members
Between the inner end rivets of the bar for single lacing

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Structural Analysis
Pick up the correct statement for the web stiffeners.

Vertical stiffeners are spaced at a distance not greater than 1.5 d and not less than 0.33 d
All of these
For horizontal stiffeners, d is the clear distance between the horizontal stiffener and the tension flange
d is the distance between flange angles or the clear distance between flanges

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