Which of the following is a statically indeterminate structure?
In the two hinge arch, we have 2 hinges at two support of the arch and have four reaction components, as in a 3 hinge arch.
Degree of static indeterminancy = no of reactions- no of equilibrium equations= 4 − 3 = 1: statically
But here we don't have an additional equation to solve the structure and hence our 2 hinge arch is indeterminate by degree 1.
For a cantilever beam,
Degree of static indeterminancy = no of reactions- no of equilibrium equations= 3 − 3=0: statically determinate
For the three-hinged arch,
For simply supported beams,