6
Statically Indeterminate Structures
6.1 INTRODUCTION
Generally the trusses are supported on (i) a hinged support and (ii) a roller support. The reaction components of a hinged support are two, and for a roller support reaction component is only one. For any truss, if the number of members making truss is m and the number of joints is j, then for a perfect frame m = 2 j – 3.
The equations of static equilibrium are sufficient to determine internal forces in members of a perfect truss. If members are less than 2j – 3, truss becomes a collapsible truss and if m > (2j – 3), the truss becomes a redundant truss. Equations from statics, 
i.e. summation ...
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