Abstract
In this study, the natural frequency separation phenomena found in the dynamic analysis of piping systems with internal fluids were identified, and methods for efficient seismic time history analysis were studied. We conducted a dynamic analysis of a piping system with consideration for the effect of its internal fluids using the coupled model, which incorporates the fluid-structure interaction effect. Owing to the mode separation effect, modes were divided into the fluid mass added (FMA) mode, generated by the added mass effect of the fluid, and coupled mode, which is created by the resonance of the internal fluid. The response contribution of the FMA and coupled modes was confirmed to be effective for efficient seismic time history analysis.
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