Abstract
This report deals with the experimental and analytical study of seismic behavior of piping systems in industrial facilities such as petro chemical, oil refinery and nuclear power plants. Special attention is focussed on the nonlinear dynamic responses of piping systems due to frictional and collisional interaction among piping and supporting devices. A spatial mock-up piping and supporting structure model wherein piping is of 30 m length and 216.3 mm diameter is excited by a large-scale (15m×15m) shaking table. Frequency function and the loading-response relationship in the form of a hysteresis loop under several excitation levels are obtained. The energy dissipated by friction and collision is evaluated, and the reduction effect due to friction and collision is quantized and evaluated in terms of response reduction factor and linearized damping ratio. Numerical analysis using a FEM model is also performed. Calculated of maximum displacement responses of piping are compared with those from the vibration test.
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