2007 年 40 巻 p. 105-108
Architects want the free shape for their architecture from the ordinary structural design. Free shape design needs the structural design agent system for their probability of structural limit. The prior study shows the both the scanning of a free shape and the creation of its structural analysis data. This report deals with the structural reasonableness of natural free shapes. As results, a seashell and a egg have a structural reasonable shape. The optimization is needed to make a proper shape from scanning data because of the initial imperfection. As there is the superficial shape which does not express its structural shape, architects must find its true structural shape.