Assertion (A) is true: Total losses in pre-tensioned concrete beams are higher compared

to post-tensioned concrete beams.

Reason (R) is true: In pre-tensioning, elastic shortening loss always takes place because

the prestress is transferred to the concrete immediately, compressing it

In post-tensioning, if all bars/tendons are tensioned simultaneously, the loss due to

elastic shortening is zero. Even if tensioned sequentially, the loss is much lower

Correct Explanation: Because elastic shortening is a major inherent loss that heavily

impacts pre-tensioned members but is highly minimized or avoided in post-tensioned

members, Reason (R) is the direct technical cause behind Assertion (A).