In case of a simply supported I-section beam of span L and loaded with a central load W, the length of elasto-plastic zone of the plastic hinge, is
A
$$\frac{{\text{L}}}{2}$$
B
$$\frac{{\text{L}}}{3}$$
C
$$\frac{{\text{L}}}{4}$$
D
$$\frac{{\text{L}}}{5}$$
Correct Answer: $$\frac{{\text{L}}}{5}$$