配管系の地震応答低減に関する弾塑性サポートの有効性の検討

抄録

Two kinds of functions are required for the elastic-plastic pipe supports which can be used within plastic region; One is to enhance the design bearing capacity and the other is to provide damping using the seismic energy absorption due to elastic-plastic hysteresis. The effectiveness evaluation for the elastic-plastic design of the piping systems with elastic-plastic pipe supports was done within the limit of no plastic failure by comparing with the allowable load at the Level-D. The comparison results revealed that the traditional elastic-plastic pipe supports could increase the design bearing capacity, but they could not always provide the larger damping effect because of the dependence of hysteresis shapes on the support geometries. These results were thought to be due to the combination of the two function requirements in the same steel member. Therefore, the design idea of the elastic-plastic pipe supports with independent design of the two functions was proposed. The effectiveness was proven by the seismic response analysis.