Assertion (A): Under working loads, in a reinforced concrete beam the lever arm remains unchanged.
Reason (R) : As the bending moment increases, the total compressive force and tensile force are assumed to increase in
direct proportion.
WSM is based on the assumption that concrete remains elastic upto failure for which stress strain.
In the WSM moment of resistance is calculated from the stress block which varies linearly like strain,
So with the increase of B.M. total compressive force and tensile force are assumed to increase in direction proportion
and hence the lever arm remains unchanged.
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