Question

Difference between Over reinforced and Under reinforced

Answer 1

Answer:

The stresses in concrete and steel reach to permissible values at the same time.

concrete and steel theoretically fail at the same time.

Practically it is difficult to have a balanced section.

Theoretically all the sections designed are balanced sections.

The failure is by primary compression( In practise the ultimate failure is by crashing of concrete in compression zone only, even though beam is balanced section is called primary compression).

Answer 2

Answer:

A balanced sections is that in which stress in concrete and steel reach their permissible value at the same time. This means that stress diagram is as shown in .The percentage of steel corresponding to this section is called as balanced steel and the neutral axis is called