Numerical evaluation of the effectiveness of flexible joints in buried pipelines subjected to strike-slip fault rupture

Melissianos, Vasileios E.; Korakitis, Georgios P.; Gantes, Charis J.; Bouckovalas, George D.

doi:10.1016/j.soildyn.2016.09.012

Cited by 53 publications

(19 citation statements)

References 27 publications

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“…Flexible joints of bellow-type have not been used until now in buried high pressure pipes subjected to faulting applications. However, the extensive parametric feasibility study presented in Melissianos et al (2016) provides encouraging results on the efficiency of this approach. It is noted that the practical application of joints has to be preceded by practical and regulatory provisions regarding several technological issues, such as the pipe-joint welding and the joint protection against corrosion and external damage.…”

Section: Other Measuresmentioning

confidence: 98%

“…• By introducing bellow-type flexible joints between adjacent pipe parts in the fault vicinity, deformations due to fault activation are absorbed as rotations at the joints, and the pipe steel segments remain barely undeformed and consequently unstressed (Melissianos et al, 2016). The behavior of flexible joints in pipes under fault rupture is depicted in Figure 5, indicating that the continuous pipe structural system is modified to "segmented. "…”

Section: Other Measuresmentioning

confidence: 99%

“…These measures have been implemented in several pipeline-fault crossings (Besstrashnov and Strom, 2011;Gantes and Bouckovalas, 2013;Chenna et al, 2014). Additionally, numerical results presented in Melissianos et al (2015Melissianos et al ( , 2016 indicate that the integration of flexible joints is a promising solution for the protection of buried pipes, considering on the one hand that joints are commercial products and on the other hand the absence of significant constructional requirements. Thus, the introduction of joints will also be examined and compared to the above commonly used measures.…”

Section: Preventive Measuresmentioning

confidence: 99%

“…• Flexible Joints (OT1) Hinged bellow-type flexible joints are placed along the pipeline around the fault vicinity, adopting the configuration proposed in Melissianos et al (2016) and taking also into account the fault trace uncertainty. Hinged bellows are numerically modeled as generic flexible joints (EJMA, 2008;Peng and Peng, 2009) represented by a rotational spring at the center point without modeling the joint length.…”

Section: • Pumice Backfill (Fr3)mentioning

confidence: 99%

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Evaluation of Seismic Protection Methods for Buried Fuel Pipelines Subjected to Fault Rupture

Gantes

Melissianos

2016

Front. Built Environ.

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Buried steel fuel pipelines are critical lifelines for the society and the economy but are very vulnerable to earthquake-induced ground failure. Traversing seismic areas inevitably results in several pipe-fault crossings. Fault rupture forces a buried pipeline to undergo deformations that could be substantial and heavily endanger its integrity. Due to the grave consequences of a potential pipe failure, mitigating measures are commonly applied at pipe-fault crossings to reduce the effects of a potential fault activation. In this paper, a comparative review of several measures that are used in practice or have been proposed in the technical literature is presented. Numerical analyses are then carried out to compare the effectiveness of commonly used measures and to extract conclusions regarding their applicability. Results indicate that the most efficient among the evaluated measures are pipe placement within culverts and use of flexible joints. Trench backfilling with pumice is a moderately effective measure in terms of pipe protection, while steel grade upgrade, wall thickness increase, and pipe wrapping with geotextile are found to be insufficient protection methods.

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Section: Other Measuresmentioning

confidence: 98%

Section: Other Measuresmentioning

confidence: 99%

Section: Preventive Measuresmentioning

confidence: 99%

Section: • Pumice Backfill (Fr3)mentioning

confidence: 99%

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Evaluation of Seismic Protection Methods for Buried Fuel Pipelines Subjected to Fault Rupture

Gantes

Melissianos

2016

Front. Built Environ.

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“…In addition, some mitigation studies have also been conducted to lower the fault-induced pipelines, i.e. Choo et al [28] proposed a remediation technique for buried pipelines subjected to the strike-slip faulting using the expanded polystyrene (EPS) geofoam blocks as low-density backfill and Melissianos et al [29] numerically studied the effectiveness of an innovative flexible joint to mitigate the damages of faulting on pipelines.…”

Section: Introductionmentioning

confidence: 99%

Response of buried oil and gas pipelines subjected to reverse faulting: A novel centrifuge-finite element approach

2017

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Buried pipelines, transporting fuels, inevitably face active faults when they pass through various seismic regions. These faults may damage the pipelines severely; hence numerous analytical, physical and numerical studies have been conducted with their own pros and cons to investigate the pipeline response due to the faulting. In the present study, an innovative combination of centrifuge and numerical modeling methods has been employed to overcome the geometrical limitation of the small scale physical modeling. Then, it is applied for investigation of buried pipelines response due to reverse faulting. Initially, two centrifuge tests with the fixed end pipelines have been conducted and employed as the benchmarks for the verification of a numerical model. Then, the calibrated numerical model has been used to develop the novel pipeline spring-like end connection system which is supposed to represent the response of the omitted pipeline parts. Eventually, a centrifuge test was conducted, employing the novel end connection system which verified the proper performance of the system. Then, the model is employed for investigation of buried pipelines response due to reverse faulting and the results are also presented.

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Local buckling evolution mechanism of a buried steel pipe under fault movements

Zhang

Chen

Zhang

2019

Energy Science & Engineering

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Pipe is the main transportation way for oil and natural gas. Fault movement mainly caused by earthquake, which will induce pipe bending, tension and compression. Then oil or gas leakage appear. Based on the moving mechanism of strike‐slip fault and reverse fault, a numerical simulation model was employed to study the buckling evolution mechanism of the buried steel pipe under fault movements. The evolution processes of buried pipe under the fault moving action were analyzed, and the effects of pipe internal pressure, fault displacement, and pipe diameter‐to‐thickness ratio on the pipe buckling were discussed. The results demonstrate that there are three mechanical evolution stages on the pipe in the process of fault movement. High stress appears on the bending regions of pipe wall, and axial strain always fluctuates along the axial length. When the fault displacement is large, pipe collapsing and wrinkling patterns occur, which can be reflected by a sharp fluctuation of axial strain. The high‐pressure pipe under the action of reverse fault is prone to failure than the low‐pressure pipe. The pipe with a large D/t in the hanging wall is easier to be buckled than that with a small D/t in the footwall. The results obtained can be used for the design and evaluation of buried oil and gas pipes.

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Numerical evaluation of the effectiveness of flexible joints in buried pipelines subjected to strike-slip fault rupture

Cited by 53 publications

References 27 publications

Evaluation of Seismic Protection Methods for Buried Fuel Pipelines Subjected to Fault Rupture

Evaluation of Seismic Protection Methods for Buried Fuel Pipelines Subjected to Fault Rupture

Response of buried oil and gas pipelines subjected to reverse faulting: A novel centrifuge-finite element approach

Local buckling evolution mechanism of a buried steel pipe under fault movements

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