Amphitheatre in Bytom, Poland A new extraordinary outdoor thea- tre was opened in Bytom, Poland, in August 2014. From a structural en- gineering point of view, the building consists of two parts (a theatre stage and a backstage) geometrically interconnected together by a spatial- shaped roof, providing a remarkable design of the building. Structure of Theatre Stage The curved roof structure of the theatre stage is comprised of ten lon- gitudinal frames of glued-laminated timber with various shapes that are hinge connected to the supporting walls of reinforced concrete. The frames have a thickness of 100 mm and a variable cross-section from 600 to 1030 mm and a camber rise from 3700 to 6450 mm, and they bridge a distance of 18 m in the longitudinal direction. The distance

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