Loadbearing structures and detailed design - Concrete Structures for Wind Turbines - page 173

Fig. 4.38 Failure curves for the biaxial stress state S cd,min ¼0.6
Fig. 4.39 Failure curves for the biaxial stress state S cd,min ¼0.8
with higher numbers of fatigue cycles is greater for biaxial repeated compressive loads
( s 11 ¼s 22 ) than for uniaxial ones. This can be attributed to the different courses of the
damage variables in the high-cycle range. It is obvious that up to approx. log N ¼ 8, the
biaxial fatigue strength for repeated compressive loads is greater than the uniaxial
fatigue strength. This no longer applies when log N ¼ 10. The failure curve for