We validate the Timoshenko beam model as an approximation of the
linear-elasticity model of a three-dimensional beam-like body. Our validation
is achieved within the framework of $\Gamma$-convergence theory, in two steps:
firstly, we construct a suitable sequence of energy functionals; secondly, we
show that this sequence $\Gamma$-converges to a functional representing the
energy of a Timoshenko beam.