Question

The degree of static indeterminacy of the rigid frame having two internal hinges as shown in the figure below, is______.

• A. 7
• B. 8
• C. 6
• D. 5

Answer 1

The correct option is D 5


Rule : All the joints are made rigid by providing extra restraints (r'). The structure is then cut to make open tree like structure.
Degree of static indeterminacy
$D_s=3c-R^{\prime }(\text{For planar frames)}$

where c $\to$ No. of cuts required to make open tree like structure.
$D_s=3\times 4-7=5$