Author(s)

M. Mollaert

Abstract

Since membrane structures are lightweight and flexible, they are well suited to being used for convertable roof systems. This paper gives a summary of the existing techniques. They are illustrated with projects from the seventies and recent designs. In these designs the retracted membrane hangs freely when it is pushed aside. There could be another approach: some computer simulations show the possibility of restressing the membrane roof into a more compact folded position. 1. Introduction Membrane roofs need a double curvature and a pre-tension in both principal directions to ensure a stable behaviour. Due to this double curvature, folding and sliding patterns cannot be chosen arbitrarily. Convertible membrane structures can be classified as follows [1]: If the supporting structure remains stationary and only the membrane moves, the movement can be Figure 1. P

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