3. Cracking
The purpose of the verification is to ensure that the maximum calculated crack opening (w k ) does not exceed a limit (w max ) that depends on the nature and purpose of the structure, and the cost resulting from this limitation.
Note :In the absence of specific requirements (e.g. watertightness), the recommended values of w max adopted by the National Annex for the various exposure classes are as follows are subject to a quasi-permanent combination of loads:
0.4 mm for classes X0 and XC1 ;
0.3 mm for classes XC2, XC3, XC4 ;
0.2 mm for classes XD1, XD2, XS1, XS2 and XS3.
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