A number of studies have been conducted on seismic response reduction technique of piping systems. Among them, seismic supports including elastic-plastic damping devices are rapidly developed for real application. Dynamic vibration absorbers, which are directly attached to pipe, provide another technique for seismic response reduction. When they are successfully applied to piping system, they can reduce number of supports with rigid structures and can be useful for improvement of piping layout. In order to obtain above improvements by the dynamic vibration absorbers, its effectiveness in reducing the large vibration response of the piping system must be verified under the strong earthquake condition. Recently, development of such mechanism is not so difficult. However, there are some problems to assure reliability of such devices. Typical problems to be solved are strength of device against strong excitation, adaptation for multi-mode's vibration of pipe, and performance with non-linear behavior of pipe system. Shaking table tests are very effective to investigate these problems. The authors have developed a dynamic vibration absorber which uses an air cylinder coil spring and magnetic damping devices and, applied it to a real scale piping model. Vibration test results using 3-dimensional piping model have shown the good performance of the absorber, although some problems remain to be solved before actual application. In this paper the authors would like to report the performance of this newly developed dynamic vibration absorber for seismic response reduction of piping systems.
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