Jack Region Properties

Set the default jack properties in the Default Jack Properties dialog box by double clicking the Jack Region tool (). You can choose to ignore the jack region property values in the Jack Region Properties dialog and instead use the PT System values.

The following is a list of jack region properties:

Setting	Description
Jacking Stress	The stress in the strand at the jack at jacking.
Anchor Friction Coefficient	Loss of stress due to friction in the anchorage. It is a fraction with no units. You would enter a 2% loss as 0.02. Most PT suppliers recommend a value of zero for unbonded tendons. You might consult with a local PT supplier regarding bonded tendons.
Wobble Friction Coefficient	Friction calculations use this property (k) to estimate losses due to accidental curvature (in the horizontal and vertical planes). It is the product of the angle friction coefficient and the accidental angular change per unit length. Note: Some engineering communities (Australia in particular) use a definition of wobble coefficient that is the accidental angular change per unit length. These communities can calculate the wobble coefficient that Concept uses, k, with the following relationship: k = AngularWobbleCoefficient * mu.
Angle Friction Coefficient	Loss due to deliberate curvature (in the horizontal and vertical planes). Most designers know it as mu.
Seating Distance	The distance that the wedges recede into the anchorage. This occurs when the field operator releases the tension in the jack.
Long Term Losses	The sum of losses such as creep and shrinkage of concrete, and relaxation of strand. It also includes the loss due to elastic shortening of the concrete even though it is a short‐term loss.