Figure 4: Time-variant reliability index: flexural, shear, flexural, and shear (total): (a, i) 13°C [1.8-180-13], (a, ii) 23°C [1.8-180-13], (a, iii) 23°C [1.8-180-13], (b, i) 13°C [3.7-250-13], (b, ii) 23°C [3.7-250-13], and (b, iii) 23°C [3.7-250-13].