The replacement of traditional steel bars by steel fibres in concrete slabs supported on columns (elevated steel fibre reinforced concrete, E-SFRC, slabs) is still a challenge, but experimental results with real scale E-SFRC evidence the potential of fibre reinforcement for this type of applications. Taking advantage of the results obtained in comprehensive experimental program with a real scale E-SFRC, numerical simulations were executed to assess the recommendations of Mode Code 2020 for modelling the post-cracking tensile behaviour of SFRC in the context of the design of SFRC structures. Despite the structural performance of the experimentally tested E-SFRC in terms of ultimate load carrying capacity, premature cracking and relatively large deflection were registered during the first days after removal of the moulds. These events were already observed in other experimentally tested real scale E-SFRC slabs, so it is important to understand their origins and consequences in terms of serviceability and ultimate limit state design verifications. Therefore, a thermal-mechanical analysis was performed considering SFRC maturation phenomena, including creep and shrinkage, by using FEMIX software with a multidirectional fixed smeared crack model. Due to the large dispersion of the results characterising the post-cracking tensile behaviour of SFRC, simulations using characteristic and average values are considered, and the obtained results are presented and discussed.