Bending-active represents a structural typology whose geometry is based on the elastic deformation of initially straight members that, in the case of beams, are known as elastica. Until now, fiber-polymer composites were used only for small-scale temporary bending-active structures. This study explores the application limits of composites for permanent large-scale bending-active structures. A systematic evaluation of the effects of the most influential geometrical and material parameters and their interactions on the structural behavior is carried out. To obtain the highest applicable live load and maximize material use, the bending degree should reach the creep rupture stress limit. Moreover, increasing the material stiffness and creep-rupture stress limit allows the span, applicable live load and material use to be further increased. The study demonstrates the feasibility of using composites for large-scale permanent elastica beams and contributes to supporting the transition from today's small-scale temporary composite bending-active structures to large-scale permanent applications.