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Comment: Migrated to Confluence 5.3


  • Set coefficients to zero for frictional losses due to curvature and wobble effects. Specify zero anchorage slip loss, unless slip is used to model the effect of transfer length. These parameters are zero because concrete is placed around stressed tendons.
  • The effect of transfer length could be modeled as follows (note that it is not possible to model transfer length using anchorage slip loss, because it will, in the absence of friction losses, reduce the presstress forces in the entire tendon, not just the transfer length zone):
    • Model the tendons in the transfer length zone by separate tendon objects. Determine their length based on the code requirements for the transfer length. Either apply constant average force or jack from one end that is towards the middle of the beam and specify the friction losses such that the force on the other end of the tendon (ie. at the end of the beam) is zero.
  • Jack tendons from both ends.
  • In the analytical model, tendon load transfers to the concrete at anchorage locations rather than over transfer length. The effect of transfer length may be modeled through anchorage-slip loss.
  • Use staged construction to apply prestressing load to isolated and adequately supported prestressed members. At this point, prestressing only affects the individual objects, and not the rest of the structure. Next, connect prestressed members to the rest of the structure, and apply any additional loading.