Interaction of soil static and dynamic stiffness and buried pipeline under harmonic vibration

Roshan, Alireza Mirza Goltabar, Khalilpasha, Hossein and Ghorbani, Mohsen (2010) Interaction of soil static and dynamic stiffness and buried pipeline under harmonic vibration. American Journal of Engineering and Applied Sciences, 3 2: 441-448.

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Author Roshan, Alireza Mirza Goltabar
Khalilpasha, Hossein
Ghorbani, Mohsen
Title Interaction of soil static and dynamic stiffness and buried pipeline under harmonic vibration
Journal name American Journal of Engineering and Applied Sciences   Check publisher's open access policy
ISSN 1941-7020
Publication date 2010
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 3
Issue 2
Start page 441
End page 448
Total pages 8
Place of publication New York, NY, United States
Publisher Science Publications
Collection year 2011
Language eng
Subject 850604 Energy Transmission and Distribution (excl. Hydrogen)
090506 Structural Engineering
Abstract Problem statement: When earthquake is occur, many damages were occurred in pipelines that San Francisco (1906) and Manson (1908), Kobe (Japan) and ate are samples of this topic. So many researchers studied on the pipelines and dynamic forces. Approach: Determine static and dynamic performance parameters of the pipeline and the surrounding soil such as static stiffness, dynamic stiffness, damping and additional mass share of soil which take part with pipe mass in dynamic performance. In the static case relationship between friction forces and joint deflections in a buried element pipe had be calculated and with using of some experimental results and results are compared together. For dynamic cases, Dynamic equilibrium equation of pipeline element axial vibration in continuous system, with neglecting the effect of soil mass share which participates in producing vibration and with considering of it were abstained and values of displacement and forces were calculated. In continuous, these formulations were process for many cases and were drawn in graphs for comparison. Results: Stiffness for ω/ωn<1 doesn’t change much but for the values more than 1 it increase rising. when ω/ωn<1 the ratio of dynamic stiffness to the static stiffness is less than unique except in big amount of damping ratio (ρ>0.5) which the ratio becomes more than 1. Finally for ω/ωn>1, the ratio of dynamic to static stiffness rises rapidly and by increasing the additional mass, the value of dynamic stiffness in case of ω/ωn>1 would increase highly. Conclusion: The static performance between soil and pipe is nonlinear in axial direction and when the hysteric dominates grows, the value of force dominates between soil and pipe and dynamic stiffness would ascend. Also by increasing damping ratio, the dynamic stiffness would increase too however it depends on the static to dynamic stiffness ratio and the damping ratio.
Keyword Interaction
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2011 Collection
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Created: Wed, 03 Nov 2010, 12:23:28 EST by Jeannette Watson on behalf of School of Civil Engineering