The elongation showing in both end prestressed post tensioned cable is unequal. Is this correct? is it due to first right then left prestressing command in PT. We can’t give PT command both side at once.
Second is where to check elastic shortening Sofi plus report or have to run separate teddy command to calculate it
Depending on the geometry of the tendon and the losses that occur, the elongation on each side is of course different. A simple thought experiment:
The tendon is completely straight and we prestress it from the right until a force of 1000 kN is reached in the tendon. We assume that there are no friction losses and that the elongation on the right side is 100 mm. Under these conditions, the tendon has a force of 1000 kN everywhere (including at the left end). If the jack is then removed and we have a slip of 0, the force of 1000 kN remains throughout the entire tendon. Even if we then tell the program that prestressing of 1000 kN should also be applied from the left, nothing happens anymore. The force is already present, so no additional prestressing is required, and therefore the elongation on the left is 0.
As a rule, prestressing is calculated within a construction stage analysis using the CSM. The elastic shortening then corresponds to the shortening of the girder when the prestressing is applied. You therefore need to check, for example in the Graphic, the nodal deformations for this load case.