The distribution of forces in a statically indeterminate structure is not uniquely determined by statics alone. Consequently a designer has a range of options to ensure a safe system of loading and balanced equilibrium.
A client proposed steel truss structure is shown in Figure 1.
Figure 1: Truss supporting load
Obtain a possible distribution of forces in equilibrium for each member in the truss by ignoring one group of diagonal members. Sign convention = compression positive.
Obtain another possible system of forces in equilibrium with the applied load by ignoring the diagonals considered in (i) and reinstating the omitted members.
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