ABSTRACT
The level of prestress and the layout of tendons in a member are usually determined from the serviceability requirements for that member. For example, if a water-tight and crack-free slab is required, tension in the slab must be eliminated or limited to some appropriately low value. If, on the other hand, the deflection under a particular service load is to be minimised, a load-balancing approach may be used to determine the prestressing force and cable drape (see Section 1.4.3).
