Numerical Modeling of Wave Feature to Enhance the Performance of Buried Steel Pipelines Subjected to Faulting Displaceme
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ORIGINAL PAPER
Numerical Modeling of Wave Feature to Enhance the Performance of Buried Steel Pipelines Subjected to Faulting Displacements Mehrdad Naghdali1
•
Ali Reza Bagherieh1 • Amirhossein Bagherieh2
Received: 20 August 2019 / Accepted: 18 January 2020 Ó Indian Geotechnical Society 2020
Abstract Earthquake-induced permanent ground deformations are among the most important causes of damage to lifelines. Buried pipelines are longitudinal structures that are prone to be exposed to the faulting displacements. Improving the performance of these lifelines is of particular importance. This research numerically investigates the effect of a recently introduced wave feature (segments with rotational and axial flexibilities) on the behavior of buried pipes subjected to the displacement of the strike-slip faulting. Three-dimensional nonlinear finite element simulations were conducted in which the pipe and wave feature were modeled by shell element and peripheral soil was modeled by three-dimensional continuum elements. The accuracy of numerical simulations was examined by comparing the results with large-scale physical experiment. The comparison shows that the results of numerical modeling are in good agreement with experimental results. As an advantage of a calibrated numerical simulation, it is possible to extend the range of predictions and get the generalized response of the system in other geometrical and boundary conditions in which the experimental data are not available. In order to study the effect of the wave feature joint on the behavior of buried pipeline, the results were compared with a pipe with identical conditions in which the wave feature was not installed. It was found that wave feature substantially reduces the longitudinal forces and strains and preserves the cross-sectional area of the & Ali Reza Bagherieh [email protected] 1
Department of Civil Engineering, Malayer University, Malayer, Iran
2
Department of Civil and Environmental Engineering, University of New Mexico, Albuquerque, USA
pipeline. Therefore, it considerably improves the performance of the pipe against faulting displacements. Keywords Strike-slip fault Wave feature Finite element method Steel pipeline Permanent ground deformations
Introduction The systems of buried pipelines play a crucial role in the economy of society, prosperity and service to people. Hence, they are called lifelines. The use of buried pipelines is the least expensive way to transfer the fluids needed by modern civilizations such as water, gas and oil products in large volumes. Due to the long distance of cities from sources and active tectonic phenomena in some areas, pipelines are prone to be subjected to a variety of hazards, including the faulting displacements. Given the fact that a large part of the economy of the society is dependent on these lines, their damages impose great economic losses. In addition, depending on the type of fluids being transported, the failure of buried pipelines can result in irreparable environmental damages to e
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