As part of this research project, the behaviour of non-metallic reinforcement based on fibre-reinforced polymers (FRP) in compression has been investigated since 2021. Initially, the decisive material properties (compressive strength and elastic modulus) of different FRP reinforcement bars (carbon, glass, basalt) were investigated in compression as part of a large-scale test program. In the further course, the experimental investigations were extended to the creep behaviour of such reinforcement in compression and, based on composite tests with concrete, the stress redistribution behaviour was studied when subjected to a 190 days period of axial compression. Finally, the experimental results were used to set up a nonlinear model to assess the second-order deflections of FRP-reinforced columns, which was used to calibrate a practicable engineering model. In addition to important results of the project with regard to the fundamental findings of FRP reinforcement in compression, further practical engineering models and partial safety factors were derived, which enable the application of such reinforcement in practice.