弾塑性ダンパ支持配管系の耐震設計手法の開発 : 第4報, 時刻歴解析で用いるダンパの荷重-変位モデルの検討

概要

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Component and piping systems in current nuclear power plants and chemical plants are designed to employ many supports to maintain safety and reliability against earthquakes. However, these supports are rigid and have a slight energy-dissipating effect. It is well known that applying high-damping supports to a piping system is very effective for reducing the seismic response. In this study, we investigated the design method of the elastoplastic damper [energy absorber (EAB)] and the seimic design method for a piping system supported by the EAB. Our final goal is to develop the technology to apply the EAB to the piping system of an actual plant. In this paper, the vibration test results of one-dimensional and three-dimensional piping models and their time history analysis results are presented. In the time history analysis, we used the Ramberg-Osgood model and the EAB model as the EAB hysteretic loop. The EAB model is the hysteretic loop that is obtained by the beam theory using the bilinear model as stress-strain characteristics. It was confirmed that the analysis results agreed well with the test results.
1996-02-25