EXPERIMENTAL-STUDY ON SEISMIC RESPONSES OF PIPING SYSTEMS WITH FRICTION .1. LARGE-SCALE SHAKING TABLE VIBRATION TEST

This report deals with the experimental study of seismic response beha vior 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 due to frictional vibrat ion appearing in piping and supporting devices. A three-dimensional mo ck-up piping and supporting structure model wherein piping is of 30-m length and 200-mm diameter is excited by a large-scale (15 m X 15 m) s haking table belonging to the National Research Institute for Earth Sc ience and Disaster Prevention in Tsukuba, Ibaraki. Power spectra of th e response vibration and the loading response relationship in the form of a hysteresis loop under several loading conditions are obtained. T he response reduction effect caused by frictional vibration is evaluat ed and demonstrated in terms of ''response reduction factor.''