Equivalent time to cater for the effects of the heat treatment on the prestress loss, teq
Eurocode 2 part 1-1: Design of concrete structures 10.3.2.1 (2)
An equivalent time should be added to the time after tensioning t in the relaxation functions (see 3.3.2 (7)). The equivalent time can be estimated as follows:
|teq = [(1,14Tmax - 20)/(Tmax - 20)]⋅Σ(T(Δti) - 20) Δti||(10.2)|
- is the temperature during the time interval Δti.
This application considers tree time intervals.
- is the maximum temperature during the heat treatment.
This application calculates the equivalent time teq from your inputs.