Abstract
Prestressed concrete is concrete whose load-carrying capacity and durability have been enhanced by introducing prestress in concrete to overcome concrete's inherent weakness in tension. For this reason, prestress is the most important factor in prestressed concrete structures, and grasping the prestressed state of existing prestressed structures is extremely important for the maintenance of such structures. A number of methods for the examination of residual prestress have been developed and their practical application is progressing. This paper introduces some representative examples of these methods.
