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STRUCTURAL CONCEPT
The large roof of the center building is supported by a jointed structure composed of the large beams made of American-pine laminate timber (340mm x 800mm) from U.S.A., the small beams (170mm x 400mm) from Japan (JAS spec. grade 1) and the steel rods which work as tension bar. This structure realized to have a large span of 28m, though it is a wooden roof structure, and to restrain the central displacement of large beam in less than 63mm against 1.7m snow depth (510kg/m2 load). A light structure was created, which features a high tension cast iron joint (tension strength 80t) connecting two steel rods (36mm diameter, 14m length) as a tension bar.