234 Romuald Tarczewski Fig.18.Cylindrical shell with cross-braces placed in reverse position,over cushions Fig.19.Cylindrical shell composed of semi-rigid,translucent cushions 6.3 Multiple Hypar Roof Interesting shapes can be obtained as a result of bidirectional post-tensioning. A single hypar surface,as shown on Fig.6,can be multiplied to form a com- plex structure,Fig.21.This is a good solution for itinerant theatre troops, temporary markets,exhibitions etc. 6.4 Deployable Inflated Bridge Easily assembled and quickly erected structures,as described above,are pre- destinated for applications in military bridging systems.In this case the bridge234 Romuald Tarczewski Fig. 18. Cylindrical shell with cross-braces placed in reverse position, over cushions Fig. 19. Cylindrical shell composed of semi-rigid, translucent cushions 6.3 Multiple Hypar Roof Interesting shapes can be obtained as a result of bidirectional post-tensioning. A single hypar surface, as shown on Fig. 6, can be multiplied to form a com￾plex structure, Fig. 21. This is a good solution for itinerant theatre troops, temporary markets, exhibitions etc. 6.4 Deployable Inflated Bridge Easily assembled and quickly erected structures, as described above, are pre￾destinated for applications in military bridging systems. In this case the bridge