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# 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 \$(document).ready(function () { var freeExample = \$("#freeExample").length; \$("#mainMenu li#nav-appCate, #mainMenu li#nav-appEC211").addClass("active"); var proUser = false === true || false === true || freeExample !== 0; if (!proUser) { \$('#Input input').keyup(function(){ \$('#AlertSubscribe').modal(); }); \$('#Input select').change(function(){ \$('#AlertSubscribe').modal(); }); }; var tempInput = \$("#tempInput").text(); if (tempInput != "") { \$("#Input").parent("form").deserialize(tempInput); if (proUser) { \$("#acceptBtn").trigger("click"); } }; });  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)

where:

Tti)
is the temperature during the time interval Δti.
This application considers tree time intervals.
Tmax
is the maximum temperature during the heat treatment.

This application calculates the equivalent time teq from your inputs.

Input
hours
hours
hours
°C
°C
°C
°C
Output
the equivalent time teq
hours (10.2)