Centrifuge modeling of buried continuous pipelines subjected to normal faulting

Moradi, Majid; Rojhani, Mahdi; Galandarzadeh, Abbas; Takada, Shiro

doi:10.1007/s11803-013-0159-z

Cited by 44 publications

(15 citation statements)

References 12 publications

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“…Whereas, such welded area and the adjacent heat affected zone (HAZ) would behave less ductile than the original pipe material. The comparison of the test results indicated in Table 1 with those of Rojhani et al [24] and Moradi et al [26] confirmed the interfering effect of end connections (oxy-acetylene welded zone) on response and failure of the pipeline. Therefore, conducting complementary tests of Table 1 had the outcomes of: (1) magnitude evaluation of the interfering effects of the welding end connections and (2) providing a set of pure pipeline material performance results that are described in the following.…”

Section: Pipeline End Connection Systemssupporting

confidence: 60%

“…As the long enough pipe could not be modeled in centrifuge tests to investigate the behavior of the model pipe, the pipeline end connections are of prime importance while investigating the response of pipelines due to faulting. In the tests reported by Rojhani et al [24] and Moradi et al [26], the pipes were anchored to the end walls using oxy-acetylene gas welding. The connections were considered fixed and assumed to be the last affected points of the pipeline subjected to the faulting.…”

Section: Pipeline End Connection Systemsmentioning

confidence: 99%

“…Thereafter, a series of large and small scale modeling of pipelines subjected to strike-slip and normal faulting were carried out by O'Rourke et al [18,19], Choo et al [20] and Ha et al [21,22,23]. More recently, Rojhani et al [24,25] and Moradi et al [26] conducted a series of centrifuge tests of pipelines subjected to normal and reverse faulting. Also, Hojjat Jalali et al [27] have conducted experimental full scale and numerical studies on the effects of reverse faulting on the buried gas pipelines.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Pipeline End Connection Systemssupporting

confidence: 60%

Section: Pipeline End Connection Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2017

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“…Among the latter cases, pipelines are mostly vulnerable to active fault crossings (e.g. [17]) since the strength of the surrounding soil may not reduce significantly as in the liquefaction or landsliding problems, and localized large straining are likely to occur along the pipeline. Several well-known examples of major pipeline failures induced by the interaction with the seismic fault offset are from San Fernando (California, 1971) [19], Manjil (Iran, 1990) [23], Kocaeli (Turkey, 1999) [8], and Chi-Chi (Taiwan, 1999) [16].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of the interaction of pressurized large diameter gas buried pipelines with normal fault ruptures

Özcebe

Paolucci

Mariani

2017

Soil Dynamics and Earthquake Engineering

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Abstract:There is a growing attention towards the seismic response of large diameter pipelines, owing to the potential adverse impact on economy and civilized life of a structural collapse under earthquake effects, such as strong ground shaking, and other earthquake related effects such as fault rupture, landsliding and liquefaction. The intersection of a fault rupture with a pipeline is of special concern, because the safety verification is affected by significant uncertainties in the loading condition, related to the unknown exact location where the fault offset may occur, the unknown amount of the offset itself, as well as the intersection angle of the fault rupture with the pipe axis. Besides, the inherent analytical/numerical complexity of the problem may require 3D finite element models with non-linear constitutive laws and large deformations.In this paper a summary is presented of a comprehensive set of 3D numerical simulations of the interaction of a large diameter gas pipeline with a normal fault rupture, with the main objectives of: 1) throwing light on the pipeline performance under increasing levels of fault offset, including crosssectional buckling and ovalization; 2) providing a parametric set of results, including the variability of the fault-pipe intersection angles, of the mechanical properties of the pipe-soil interface, as well as of the operating conditions, in terms of internal gas pressure and temperature variations.Keywords: fault-soil-pipeline interaction, 3D finite element modeling, performance based seismic design Affiliations:1.

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“…Pipelines can pass different angles of various faults. Various studies have examined the impact of normal faults [4] to [6]. Karamitros et al analytical and numerical abundance of research conducted on the pipeline and found that the regulation values of strain and stress at the intersection of faults with numerical and analytical values are a good match [5], [6].…”

Section: Introductionmentioning

confidence: 99%