Correct Answer - Option 3 : Either compressive force or tensile force
Answer:
The moment of resistance of a balanced reinforced is obtained by multiplying the lever arm with either compressive force or tensile force.
Explanation:
Moment of Resistance
The moment of resistance of the concrete section is the moment of the couple formed by the total tensile force (T) in the steel acting at the center of gravity of reinforcement and the total compressive force (C) in the concrete acting at the center of gravity (c.g.) of the compressive stress diagram. The moment of resistance is denoted by M.
Lever Arm: The distance between the resultant compressive force (C) and tensile force (T) is called the lever arm, and is denoted by z.
Moment of resistance is given by,
Mr = C × z or T × z
Where,
C = Total compressive force, T = Total tensile force and z = lever arm
