配管系の地震応答に対する支持部弾塑性変形の影響

（FEM解析による事例検討）

抄録

In order to investigate the effect on the seismic response of the piping system when considering the elasto-plastic behavior of the piping support structure or the main body of the piping system, an elasto-plastic time history response analyses were conducted on a piping system model having multiple support structures. From the analysis results, it is confirmed that the response acceleration can be reduced by introducing the support stiffness, because it decreased the natural frequency of the piping system and it resulted in increasing the frequency ratio. The response of piping system can be further suppressed by introducing the inelastic behavior of support structures. However, the analytical results shows that the response displacement of the piping system tends to increase when the yield load of the support structure is fairly small. Therefore, when elasto-plastic deformation of the support structure is allowed, it is necessary to assess the effect on the overall response of the piping system and to give an appropriate elasto-plastic characteristics to the support structure.