Study on nonlinear seismic responses of piping systems by large scale shaking table: Response reduction evaluation due to friction and vibro-impact behavior

This report deals with the experimental study of seismic response behavior of piping systems in industrial facilities such as petrochemical, oil refinery and nuclear plants. Special attention is focused on the nonlinear dynamic response of piping systems to vibro-impact behavior and frictional vibration appearing in piping and supporting devices. A three-dimensional mock-up piping and supporting structure model wherein piping is of 30m length and 216.3mm diameter is excited by a large-scale (15 m x 15 m) shaking table belonging to the National Research Institute for Earth Science and Disaster Prevention in Tsukuba, Ibaraki. Power spectra of the response vibration and the loading-response relationship in the form of a hysteresis loop under several loading conditions are obtained. The response reduction effect caused by collisional and frictional vibration is evaluated and demonstrated in terms of response reduction factor