Abstract
This report deals with the experimental study of seismic behavior of piping systems in the industrial facilities such as petro-chemical plants and nuclear power plants. Special attention is focussed on the nonlinear dynamic of piping systems due to frictional vibration appeared among piping and supporting devices. 3 dimensional mock-up piping model having 30 m Iength and 8 inches diameter is excited by large scale (15 m x 15 m) shaking table. Power spectra of the vibration and loading-response relations in the form of hysteresis loop under several excitation levels are calculated. Response reduction effect caused by frictional vibration is evaluated and demonstrated in terms of response reduction factor. Numerical simulation by use of nonlinear simplified friction model is also performed and calculated piping is compared with those from vibration tests.
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