Résumé : Textile Reinforced Cement (TRC) composites provide slender concrete material solutions. Using 3D textile reinforcements significantly improves the bending performance in the post-cracking stage compared to 2D textiles. Yet, no computational model takes into account explicitly the woven connections in 3D TRC. This contribution develops a novel strategy for generating the complex geometry of a mesoscale through-thickness Representative Volume Element (RVE) of 3D TRC shells, thanks to advanced geometric algorithms such as Rotation Minimising Frames (RMF), subsequently meshed and used in finite element (FE) analysis. The RVE with realistic reinforcement geometry enables thenumerical evaluation of different fine scale processes contributing to the composite material performance, in particular the effect of the woven reinforcement architecture. RVE simulations under two types of bending loading conditions, using computational homogenisation procedures, illustrate that the proposed approach enables the investigation of the average macroscopic bending properties of 3D TRC based on the fine scale morphology of their reinforcement, together with an assessment of local strain fields.