For full functionality of this site it is necessary to enable JavaScript. Here are the instructions how to enable JavaScript in your web browser.

# Design fatigue strength of concrete fcd,fat

## 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"); } }; });  Expression (6.76)

The design fatigue strength of concrete, fcd,fat, is calculated from:

 fcd,fat = k1⋅βcc(t0)⋅fcd⋅(1 - fck/250) (6.76)

where:

fck
is the characteristic compressive strength of concrete, see Table 3.1
fcd
is the design compressive strength of concrete, see § 3.1.6 (1)P
βcc(t)
is a coefficient which depends on the age of the concrete t:
 βcc(t) = exp { s [1 - (28/t)1/2] } (3.2)

with

t
the age of the concrete in [days]
s
a coefficient which depends on the type of cement:
= 0,20 for CEM 42,5 R, CEM 52,5 N and CEM 52,5 R (Class R)
= 0,25 for CEM 32,5 R and CEM 42,5 N (Class N)
= 0,38 for CEM 32,5 N (Class S).
t0
is the time of the start of the cyclic loading on concrete
k1
is a Nationally Determined Parameter, see § 6.8.7 (1).

This application calculates the design fatigue strength of concrete fcd,fat from your inputs. Intermediate results will also be given.

Input
days
MPa
MPa

Output
s
βcc(t0)
(3.2)
the design fatigue strength of concrete fcd,fat
MPa (6.76)