Long term parameters (PRE-Stress)

Load combination dependent concrete data is stated in the Long term parameters window. 

ULS load combinations and SLS load combinations defined as long term will automatically be copied into the table. This means that load combinations must be created before any long term parameters can be applied. Parameters for creep and shrinkage can be individually set for each load combination and member. In the case of ULS load combinations, the number entered denotes the effective creep.

Note that the effects of the long term parameters will indirectly be added together according to the dependency set between the load combinations. For example, if three long term load combinations constitute a "chain of dependency," the total value of creep and shrinkage should be divided among those three long term load combinations according to the assumed percentage of time spent in each load combination.

Relaxation in the prestressing strands are taken into account according to EN 1992-1-1 3.3.2. The value of the relaxation is calculated according to EN 1992-1-1 3.3.2 (7) for the whole element and are divided over the load combinations with the same ratio as the user have spread out the creep value.