In this paper the response of composite structural elements cast against thin-walled stay-in-place (SiP) formwork elements made of Textile Reinforced Concrete (TRC) is experimentally investigated and analytically approached. TRC comprises an innovative composite material consisting of fabric meshes made of long fibre yarns (e.g carbon, glass, aramid or basalt) arranged in at least two (typically orthogonal) directions and embedded in a cementitious fine-grained matrix. Two types of reinforced concrete specimens were considered: the first one included 22 beam-type specimens incorporating flat TRC formworks, whereas the second included 11 prismatic column-type specimens cast into permanent precast TRC shafts. Moment and deflection values at first-crack, steel yielding (where applicable) and ultimate for the beam-type specimens were analytically derived based on a proposed simplified approximation of strain distribution across a fibre roving. Based on the results of this study SiP TRC formwork elements comprise an attractive system for hybrid construction practices.

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