動吸振器効果を狙った大重量副振動系を有する制震架構におけるストローク制御法に関する研究

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タイトル別名
  • STUDY ON STROKE CONTROL STRATEGY OF SEISMIC CONTROL STRUCTURE UTILIZING LARGE-WEIGHT SUB-SYSTEM AS DYNAMIC MASS DAMPER
  • ドウキュウシンキ コウカ オ ネラッタ ダイ ジュウリョウ フクシンドウケイ オ ユウスル セイシンカコウ ニ オケル ストローク セイギョホウ ニ カンスル ケンキュウ

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 The TMD (Tuned Mass Damper) is an effective structural control device which has been undergoing continuous development since the 1980's. However, in most situations, its mass has been limited to less than 1% of that of the entire building due to restriction such as weight limitations and spatial difficulties. When mass ratio is small, various problems need to be overcome such as tuning sensitivity and transient characteristics. As a result, in the early studies related to mass dampers, and the efforts were focused on how to compensate for low mass ratio by active control technology. Although performance has been improved by hybrid control technology, devices for controlling major earthquakes have not been put into use for a long while because of the problems of energy supply and stroke control.<br> However, recent studies have examined the utilization of a part of a structure's weight as a dynamic damper. Because a much larger mass ratio can be provided than a conventional TMD, these types of structures can potentially achieve a superior seismic control. In addition, the response reductions of a main-system and a sub-system can be made compatible. Furthermore, focusing on stroke control, giving parameters of a sub-system shifted from optimum settings would be effective, while maintaining response reduction owing to the system's high robustness.<br> This paper proposes a stroke control strategy for seismic control of a structure that includes large-weight sub-systems. It first defines optimum parameter setting of a sub-system that minimizes the response of a main-system using a 2DOF analytical model. In response evaluation, random vibration theory is introduced, and mean response assuming white noise input is discussed. After several examinations of the influence of a sub-system's parameter on the response reduction effect, a relational expression that connects sub-system's parameters and stroke is derived. We also clarify that the expression is applicable in evaluating maximum response against seismic input which is emphasized in actual design by introducing unique design parameters. Then the setting procedure based on the response spectrum is presented. Finally, the accuracy and the validity of the proposed method are discussed through numerical analyses. By applying the proposed strategy, rational parameter settings of a sub-system matched with the design objective stroke can be obtained without performing any time history analyses.

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