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# Thermal loss of prestress during the heat curing of precast concrete elements, ΔPθ

## 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"); } }; });  10.5.2 (1)

The thermal loss of prestress during the heat curing of precast concrete elements may be estimated as follows:

 ΔPθ = 0,5 Ap Ep αc (Tmax - T0) (10.3)

where:

Ap
is the cross-sectional area of tendons
Ep
is the elasticity modulus of tendons, see § 3.3.6 (2) and § 3.3.6 (3)
αc
is the linear coefficient of thermal expansion for concrete. Following 3.1.3 (5), αc = 10⋅10-6 K-1 unless more accurate information is available.
Tmax - T0
is the difference between the maximum and initial temperature in the concrete near the tendons, in [°C].

This application calculates the thermal loss ΔPθ from your inputs.

Input
cm2
GPa
10-6 K-1
°C
°C
Output
the thermal loss ΔPθ
kN