$1.$ Using the principle of virtual work and unit load, calculate the

vertical deflection at the free end and the horizontal

deflection at the rigid joint.

$2.$ Compare the value of the theoretical deflections with the

measured experimental values and calculate the percentage

errors.

$E=$ The modulus of elasticity of the steel is $210,000$ N$/$mm

$I=\frac{b{d}^3}{12}=\frac{25(8{)}^3}{12}=1067mm$

Experimental Deflection results:

Vertical Deflection $=(-1\mathrm{.}732)(-1\mathrm{.}740-0\mathrm{.}008)$

Horizontal Deflection $=(-1\mathrm{.}94)$