動吸振器による配管系の地震応答低減に関する検討

－床応答スペクトルを用いた調査－

抄録

The purpose of this study is to clarify the seismic response reduction effect of the piping system by a dynamic vibration absorber. The piping system with a dynamic vibration absorber was modeled into a two-degree-of-freedom system composed of a simple modal mass and a dynamic vibration absorber. Using this model, the floor response spectrum for the observed seismic waves was calculated. By comparing the changes in the two floor response spectra of the piping system with the dynamic vibration absorber and the piping system without the dynamic vibration absorber, the response reduction effect of the dynamic vibration absorber and the magnitude of the added damping ratio were discussed. When a dynamic vibration absorber was installed, the peak height of the floor response spectrum of the piping system decreased, and the effect was useful for the piping system with a smaller damping ratio. Dynamic vibration absorbers are suggested to be an effective method for reducing the seismic response of small-bore piping systems with a small damping ratio.