120 残留変形を抑制するパッシブ制振システムに関する研究(スマートパッシブダンピング)

概要

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Friction dampers are useful to decrease earthquake and wind induced vibrations, but conventional ones have the tendency to accumulate residual displacement in one direction. This study aims at presenting a new smart friction damper to minimize residual deformation even after an action of intense external force. The damper is named 'smart', because it so designed as to exhibit resistance only when it is subject to displacement away from the origin. Since the damper is origin-oriented, i.e., it looses resistance when the displacement is back to the origin, a structural system equipped with this damper tends to rest at the original position when the excitation is over. First, a small-size new friction damper is designed and tested to show the availability of the concept. Then, by a series of analytic studies, it is confirmed that the structural control system presented is quite effective when it is installed into a structural system with relatively long natural period, like base isolated buildings. It is effective, because both maximum displacement and maximum acceleration would be no more than those of the systems with normal friction dampers, without causing any large residual displacement.
一般社団法人日本機械学会の論文
2002-01-11