Seismic Vibration Analysis of Fluid-Structure Interaction in LMFBR Piping Systems

[+] Author and Article Information
F. Hara

Department of Mechanical Engineering, Science University of Tokyo, Shinjuku-ku, Tokyo, Japan

J. Pressure Vessel Technol 110(2), 177-181 (May 01, 1988) (5 pages) doi:10.1115/1.3265583 History: Received March 11, 1988; Online November 05, 2009


This paper is a basic study on the vibrational characteristics of an LMFBR piping system containing liquid sodium under one-dimensional seismic excitation. Using Z -shaped piping, we formulate coupled equations for the pipe’s bending vibration and pressure wave, and transform them into two-degree-of-freedom vibration equations for the first modes of the piping vibration and pressure wave. A numerical study using the vibration model shows that: 1) the coupling effect appears between piping acceleration and liquid pressure for a piping configuration having a natural frequency ratio ν = about 0.5 to 2.0; 2) the magnitude of seismically induced pressure reaches 0.7 kPa to 1 kPa per gal; and 3) the dead-mass model of liquid gives a nonconservative response depending on the pipe’s geometrical configuration, compared to that from the pressure-wave-piping-interaction model.

Copyright © 1988 by ASME
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