Answer to Question #236886 in Civil and Environmental Engineering for Emmo

Question #236886

1. Under what situation shall engineers use jacking at one end only and from both ends in prestressing work?


1
Expert's answer
2021-09-14T01:53:36-0400

During prestressing operation at one end, frictional losses will occur and the prestressing force decreases along the length of tendon until reaching the other end. These frictional losses include the friction induced due to a change of curvature of tendon duct and also the wobble effect due to deviation of duct alignment from the centerline. Therefore, the prestress force in the mid-span or at the other end will be greatly reduced in case the frictional loss is high. Consequently, prestressing, from both ends for a single span i.e. prestressing one-half of total tendons at one end and the remaining half at the other end is carried out to enable a even distribution and to provide symmetry of prestress force along the structure.


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