Loadbearing structures and detailed design - Concrete Structures for Wind Turbines - page 172

Fig. 4.36 Failure curves for the biaxial stress state S cd,min ¼0.2

Fig. 4.37 Failure curves for the biaxial stress state S cd,min ¼0.4

fat fat

Figure 4.35 clearly indicates how the damage variables ( k

t ) influence the
forms of the failure curves. The isotropic damage behaviour is recognisable up to
log N ¼ 6. The decrease in strength as the number of fatigue cycles increases is
identical for uniaxial and biaxial fatigue loads. Subsequently, the decrease in strength

c and k