Evaluation of the Response of Buried Steel Pipelines Subjected to the Strike-slip Fault Displacement

Abstract

In this paper, the response of buried steel pipeline subjected to the strike-slip fault displacement is studied. This study aimed to identify the seismic fault under the pipe at the intersection of large displacement (up to 3 meter fault displacement) and identify failure modes in the pipe. Innovation studies the effect of thickness ratio of the diameter of the pipe failure modes of the fault displacement. The nonlinear finite element method analysis was conducted. By using ABAQUS software, nonlinear finite element analysis was carried out on the pipeline under fault displacement. Numerical modelling aimed at obtaining the amount of displacement corresponding to the nonlinear behaviour in the pipeline, as well as identifying failure modes pipes in displacement from 0.2 to 3 meter in diameter to thickness ratio, taking into account the impact of the pipeline. The results showed the nonlinear behaviour of the displacement 57.5 cm pipeline damage starts and the displacement of 1 meter buckling occurs in pipes. The displacement of 1 meter fault, failure mode is local buckling pipe, and displacement and deformation of the pipe is 1 meter looks like the letter S. The displacement of 1.5 meter high (3 meter) failure mode tube is wrinkling. And deformation of the pipe in the fault displacement of 1.5 meter, like the letter Z. With the increase in displacement from 1.5 meter to high wrinkling occurs in pipes and up to 3 meter displacement continues. Plastic strain in the fault displacement of 80 cm in diameter to thickness ratio of 112 and 96 occurs, Plastic strain ratio of diameter to thickness of 86 does not occur. Reduction in the diameter of the thickness has a positive impact on reducing plastic strain in the pipe.

Structural Behavior of Pipelines Buried in Expansive Soils under Rainfall Infiltration (Part I: Transverse Behavior)

“…The horizontal and vertical dimensions of the model are set to avoid the effects of boundary conditions. These dimensions are related directly to the pipeline diameter where according to the recommendations presented in many published researches ( [21,22,34]) it was found after simulations that it is sufficient to numerically evaluate induced large displacements on pipeline transverse cross section by having a crosssection model with 10 and 5 times the pipe diameter for horizontal and vertical dimensions, respectively. On the basis of these recommendations the present study was carried out adopting the model dimensions shown in Figure 4.…”

“…In this direction, an interesting study about the background of pipelines have been undertaken by Al-Khazaali et al [20] that can be used as a good platform to do pipeline-soil interaction researches in unsaturated mediums. Moreover, the response of buried pipelines under strike-slip fault movements have been studied by Vazouras et al [21] and Oghabi et al [22]. Saadeldin et al [23] investigated through a parametric study the influence of the moisture content variations on the longitudinal movements of a hypothetical pipeline of 6 m length and 0.15 m diameter that occurred due to change in suction by considering different boundary conditions.…”

A refined nonlinear analytical method for buried pipelines crossing strike‐slip faults

“…Recent computing and finite element method (FEM) developments can enable numerical treatment approaches that are applicable to the above‐mentioned problem 15 . In existing finite element (FE) models, pipelines are represented using beam, shell, or continuum solid elements, and the soil–pipe interaction is modeled by soil springs, that is, uniaxial nonlinear spring elements, or three‐dimensional inelastic continuum elements 4,16–28 . More recently, Vazouras et al 25 proposed a new hybrid spring‐shell model to decrease the computational cost by substituting the model effect of far distances from the fault plane using equivalent springs with pipe and soil–pipe interaction spring stiffness at both sides of the three‐dimensional FE models.…”

“…15 In existing finite element (FE) models, pipelines are represented using beam, shell, or continuum solid elements, and the soil-pipe interaction is modeled by soil springs, that is, uniaxial nonlinear spring elements, or three-dimensional inelastic continuum elements. 4,[16][17][18][19][20][21][22][23][24][25][26][27][28] More recently, Vazouras et al 25 proposed a new hybrid spring-shell model to decrease the computational cost by substituting the model effect of far distances from the fault plane using equivalent springs with pipe and soil-pipe interaction spring stiffness at both sides of the threedimensional FE models. Although the FE models are rigorous and applicable to detailed and complex problems, the validity of their results is questionable until verified by experiments or analytical methods.…”