The moment of resistance of a balanced reinforced concrete beam i
A. steel only
B. concrete only
C. steel and concrete both
D. none of these
Please scroll down to see the correct answer and solution guide.
Right Answer is: C
SOLUTION
Concept:
Balanced Section:
The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called balanced section.
It is also known as critical section. In balanced section both the material concrete and steel are used effectively (as both reaches to the permissible value), so it is considered as the most economic section.
Important point:
The different types of sections are as follows:
|
Under reinforced |
Balanced section |
Over reinforced |
|
Xu < Xu(lim) |
Xu = Xu(lim) |
Xu > Xu(lim) |
|
Ast < Ast(lim) |
Ast = Ast(lim) |
Ast > Ast(lim) |
|
MOR < MORlim |
MOR = MORlim |
MOR > MORlim |
|
Z > Zlim |
Z = Zlim |
Z < Zlim |
