Question

A steel girder of length l rests freely on two supports (Fig. 1.77). The moment of inertia of its cross-section is equal to I (see the foregoing problem). Neglecting the mass of the girder and assuming the sagging to he slight, find the deflection λ due to the force F applied to the middle of the girder.

Answer 1

One can think of it as analogous to the previous case but with a beam of length l/2 loaded upward by a force F/2.