Which of the following is correct regarding pre-stressed concrete ?
1. In reinforced concrete member, the pre- stress is introduced by tensioning the steel
reinforcement.
2. In pre- stressed concrete, compression is induced prior to loading in the zones where
external loads would normally cause tensile stresses.
Statement 1 is correct in standard prestressed-concrete literature (e.g., T.Y. Lin).
Prestressed concrete is regarded as a form of reinforced-concrete construction in which the
prestress is introduced by tensioning the high-strength steel reinforcement (tendons) and
anchoring it against the concrete.
Statement 2 is correct
This is the basic principle of prestressing: compressive stress is deliberately induced in the
concrete (before external loads act) in those zones that will later experience tensile stress
under service loads. The pre-compression counteracts the tensile stresses, thereby improving
cracking resistance and structural performance.
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