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WHEN STRUCTURES MOVE

WHEN STRUCTURES MOVE

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International Symposium on New Olympics New Shell and Spatial Structures

作者： Mamoru kawaguchi kawaguchi ＆ engineers Yoyogi 3-2-7-601Tokyo 151-0053Japan

＜正＞Moving aspects of structures are taken up. In our daily structural design the structures are assumed to be immovable, and most of structural calculations are carried out on the basis of static principles. There are cases, however, where large movements are actually experienced by our structures due to different reasons. Many of them are due to excessive loading and unexpected instability, often leading to collapse of the structures. Some other cases are related to vibration where resonance of structures with external agencies such as earthquakes and wind is discussed. Self-excited oscillation sometimes produces catastrophic and spectacular motion of structures. Since the task of structural design is to realize safe and strong structures, we should be aware of such motions and the means to prevent or control them. Controlled motions can be obtained by adopting isolators to cope with the effects of earthquakes. Structures can be designed to be assembled on the ground and then hoisted to the position. In erection of such structures a big movement is observed as in Pantadome System. Finally those structures whose intended functions are movements are described with examples of rocking stones and a flying carp.

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