Hybrid Simulation of Structure-Pipe-Structure Interaction within a Gas Processing Plant
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 12, Issue 2
Abstract
Though often overlooked, the impact of seismic transient ground deformation on natural gas (NG) pipes can be highly adverse. Particularly, pipe elbows may undergo excessive in-plane bending demand and buckling. In this paper, a critical scenario of a pipe coupling two industrial structures typically found in an NG processing plant is studied. High strain and cross-sectional ovalization on the elbows are probable during an earthquake due to the out-of-phase oscillation of the two structures imposing asynchronous displacement demands at the two pipe ends. A parametric study was first performed to investigate various structure-pipe-structure configurations that increase seismic demands to pipe elbows. Simultaneous mobilization of divergent oscillation between two supporting structures at the low-frequency range, a lower pipe-structure stiffness ratio, a shorter length of straight pipe segments in the linking pipe element, and a higher pipe internal pressure have led to the onset of critical strain demands in pipe elbows. To validate this observation, an experimental campaign was developed in which a full-scale linking pipe element was physically tested by means of hybrid simulation (HS). The study shows that the seismic interaction of the structures coupled with the pipe is nonnegligible and can even be critical for the integrity of the coupling pipe. The finding depends on the structural system’s dynamic and geometrical properties as well the frequency content of the earthquake excitation.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. Items included are the ABAQUS finite-element models and scripts used in the parametric study, the numerical data from the parametric study, the OpenSees finite-element model used in the hybrid simulation, files and software associated with the UT-SIM framework used in the hybrid simulation, and the experimental data from the hybrid simulation.
Acknowledgments
This work was funded by the Horizon 2020 Programme of the European Commission through Grant MSCA-RISE-2015-691213-EXCHANGE-Risk (Experimental & Computational Hybrid Assessment of Natural Gas Pipelines Exposed to Seismic Risk, www.exchange-risk.eu). The first author also expresses his gratitude to the China Scholarship Council for financially supporting his doctoral studies (Grant No. 201808060061).
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 12 • Issue 2 • May 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: May 17, 2020
Accepted: Sep 8, 2020
Published online: Dec 24, 2020
Published in print: May 1, 2021
Discussion open until: May 24, 2021
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