If this loss in the prestress is deviating from the estimated loss in the design, the structure will not behave in a manner as envisaged during the design. Also, the loss of the prestressing force unexpectedly occurs due to damage or breakage of prestressing strands. It is known that the loss of the prestress force in tendon occurs due to elastic shortening and bending of concrete, creep and shrinkage of concrete, steel relaxation, anchorage slip, and frictional loss between tendon and its surrounding materials. This difference in prestressing force is due to losses in prestressing force over a period of time. Hence, this difference leads to severe and critical serviceability and safety problems. Pre-stressed concrete (PSC) structures are advantageous in terms of delaying cracks, saving materials, reducing deflection etc.However, there is substantial difference between the desired and the actual prestressing forces in existing PSC structures. Awadhesh Kumar, Associate Professor, DTU, New Delhi.IntroductionPrestressed Concrete (PSC) is defined as concrete in which there have been introduced internal stresses 1 of such magnitudes and distribution that the stresses resulting from given external loading are counteracted to a desired degree.
Rajeev Goel, Senior Principal Scientist, CSIR-CRRI, New Delhi, Dr. In this study, an effort has been made to know the natural frequency of a PSC structure by Vibration Method and determining the existing prestressing force to ascertain the loss of prestress.Kumar Shashi Bhushan, Technical Officer, Dr.
0 kommentar(er)
