複数のTMDを用いた屋根型円筒ラチスシェルの振動制御

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タイトル別名
  • VIBRATION CONTROL OF CYLINDRICAL LATTICE SHELL ROOFS USING PLURAL TMDS
  • フクスウ ノ TMD オ モチイタ ヤネガタ エントウ ラチスシェル ノ シンドウ セイギョ

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 There are many examples of application of TMD. A high-rise building and a floor slab with large span in architecture field, a cable stayed bridge and a suspension bridge in civil engineering, for example. The response reduction effects by those examples are verified. TMD is fit for the vibration control of spatial structure because it is possible to install TMDs by a single supporting point. Therefore there are many studies on the vibration control for spatial structures. The vibration controls for arch structures are examined by Kato and Yamada for example. Those for dome structures are investigated by Yamada and Yoshinaka. However, the practical examples for spatial structures can not be found. There is still much left to be studied hereafter about the vibration control of spatial structures by using TMDs in practice. This paper is intended as an investigation of vibration control effects by plural TMDs of cylindrical lattice shell roofs with TMDs by numerical vibration analyses.<br> First, the effects of the number of installed TMDs and location on response reduction effects are examined. In addition, the effects of differences of period and phase characteristics of input earthquake motions on response reduction effects are investigated. Finally, the response estimation by the parallel multi-mass system substituted for arch structure with TMDs is attempted.<br> From the numerical results, it is concluded as follows.<br> 1) By installing a plurality of TMDs which target a single mode for plural modes, the responses of shell roof are reduced with wide periodic band.<br> 2) By installing the plural TMDs spatially distributed on antinodes of target modes for control, the responses of cylindrical lattice shell roofs are reduced evenly regardless of period and phase characteristics of input earthquake motions.<br> 3) Each TMD of plural TMDs has different frequency ratios, therefore there are cases where the responses of mode with the period which is close to the period of target mode are also reduced.<br> 4) The effects of distribution of Quadruple TMD which is installed four TMDs on the antinodes of mode on response reduction effects are small. The responses in the vicinity of the period of target mode for control reduce uniformly regardless of the distribution of TMDs.<br> 5) The vibration control effect is more sensitive to the differences of the period characteristics than to the differences of phase characteristics of input earthquake motions.<br> 6) The response reductions of cylindrical lattice shell roofs installed TMDs agree with the energy absorption of TMDs.<br> 7) The response reduction factors of cylindrical lattice shell roofs by installing the TMDs can be estimated by the energy absorption factors for parallel multi-mass systems.

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