NEHRP Clearinghouse

Title
Axial Vibrations of a Fluid Filled Pipe.
File
PB293838.pdf
Author(s)
Nelson, I.
Source
National Science Foundation, Washington, DC. Applied Science and Research Applications., November 1978, 41 p.
Identifying Number(s)
TN-1
Abstract
Fluid-carrying pipelines are an essential part of modern civilization and may cross seismically active regions where they may be subject to damage from earthquake induced ground shaking. The pipe motion may be in the lateral or axial directions or both. Since studies have shown that axial stresses may be an order of magnitude or more than bending stresses, axial motion is given first attention. Based on the assumption that a certain fraction of the mass of the fluid participates in the pipe response during axial motion, this study is an attempt to answer the question of fluid pipe interaction when the only mechanism for coupling is the fluid viscosity. The report includes sections on problem formulation, vanishingly small frequencies, and high frequency response. It is concluded that for any practical range of parameters, the effect of an internal fluid, coupled to a pipe through viscosity only, on the longitudinal (axial) vibrations of the pipe is negligible.
Keywords
Ground motion; Damping; Earthquake engineering; Pipelines; Earthquakes; Fluid dynamics; Vibration; Earth movements; Subsurface structures; Pipe soil interactions; Seismic waves