Analytical fragility curves for assessment of the seismic vulnerability of HP/HT unburied subsea pipelines

Mina, Daniele; Forcellini, Davide; Karampour, Hassan

doi:10.1016/j.soildyn.2020.106308

Cited by 27 publications

(39 citation statements)

References 41 publications

(69 reference statements)

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“…The seismic inputs are applied to the soil domain in the transversal direction at a depth of 25 m. In order to calculate the bending response, the pipeline was modelled as an isotropic bilinear material (yield stress σy = 448 MPa and tangent modulus Et = 2100 MPa). The strains are calculated at the central point, at the crown of the buckled pipeline (Mina et al 2020), and then compared against the failure criteria outlined in the next section.…”

Section: Numerical Modelmentioning

confidence: 99%

“…The design compressive strain εSd for different classes are represented in Table 3. The strain at failure (local buckling of the compressive side) from the FE analysis (Mina et al, 2020) is also given in Table 3. Fragility curves were applied in order to consider a probabilistic-based methodology to assess the role of soil deformability on the behaviour of HP/HT unburied subsea pipelines, as previously applied in Mina et al (2020), Forcellini (2020b and2021).…”

Section: Pipeline Failure Criteriamentioning

confidence: 99%

“…Recently Mina et al (2020) developed fragility curves that account for the interaction between buckling and earthquakes and Triantafyllaki et al (2020) performed 3D numerical simulations of a partially embedded (unburied) pipeline in to assess its vulnerability to a fault rupture. Other authors (such as Karampour et al (2018Karampour et al ( , 2015, Alrzai and , Binazir et al (2019), Stephan et al (2016) and Piran at al.…”

Section: Introductionmentioning

confidence: 99%

“…Arifin et al (2010) and Odina (2009 and modelled the soil with nonlinear springs while more recently Daiyan et al (2010) applied elasto-plastic 3D solid finite elements to investigate the soil-pipe interaction. In order to address the gap in literature, the current work aims to develop a model based on a previous recent work Mina et al (2020) and provide more insight into the failure of a subsea pipeline by investigating the effect of soil properties. Mina et al 2020 investigated the vulnerability of subsea high pressure/high temperature (HP/HT) pipelines to seismic actions.…”

Section: Introductionmentioning

confidence: 99%

“…In order to address the gap in literature, the current work aims to develop a model based on a previous recent work Mina et al (2020) and provide more insight into the failure of a subsea pipeline by investigating the effect of soil properties. Mina et al 2020 investigated the vulnerability of subsea high pressure/high temperature (HP/HT) pipelines to seismic actions. They modelled a pipeline laid on the seabed and resting on a sleeper as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Soil Structure Interaction Effects on Stability of HP/HT Unburied Subsea Pipelines Using a Probabilistic-Based Approach

Forcellini

Mina

Karampour

2021

Preprint

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Soil structure interaction (SSI) may considerably affect the seismic vulnerability of subsea high pressure/high temperature (HP/HT) pipelines. Numerical simulations are herein proposed to study the effects of soil deformability on failure of an unburied pipeline with D/t = 20, laid on the seabed and resting on a sleeper. OpenSees is used to assess an earthquake scenario imposed on a laterally buckled pipeline by considering the effects of non-linear soil behaviour on the mechanisms that induce damage on the soil-pipeline system. Uncertainties in the case study were considered by applying a probabilistic-based approach and by developing analytical fragility curves that allow estimation of the probability of exceedance of the selected failure criteria.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Pipeline Failure Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soil Structure Interaction Effects on Stability of HP/HT Unburied Subsea Pipelines Using a Probabilistic-Based Approach

Forcellini

Mina

Karampour

2021

Preprint

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Impact of local site conditions on seismic performance of free‐spanning submarine pipelines: Underwater shaking table tests and numerical simulations

Pan,

Li,

et al. 2024

Earthq Engng Struct Dyn

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Local site conditions may pose a significant influence on the seismic responses of submarine pipelines by altering both the offshore motion propagation and soil‐structure interaction (SSI). This paper aims to provide an in‐depth understanding of the influence regularity of local site conditions on the seismic performance of free‐spanning submarine pipelines (FSSPs). For this purpose, a suite of underwater shaking table tests were performed to investigate the seismic responses of FSSP subjected to the offshore spatial motions at three site categories. Response comparison factor () is defined to quantify the structural response discrepancies caused by the seismic inputs at different sites. The test results indicate that responses of the studied model FSSP gradually increase as spatial offshore motions at softer soil sites are employed as inputs; and the values of vary with a maximum magnitude of up to 40%–60% for different response indices when the site soil changes from fine sand to clay. Subsequently, the corresponding numerical simulations are carried out to reproduce the seismic responses of the test model. The experimental and numerical results meet a good agreement, indicating that the developed numerical modeling method can accurately predict the seismic responses of FSSPs. Following this verified modeling method and using the p‐y approach to address the SSI effect, fragility surfaces of the studied FSSP are derived in terms of PGA and site parameter (shear‐wave velocity in the top 30 m of the soil profile) via probabilistic seismic demand analyses. The impact of local site conditions on the seismic performance of the FSSP is quantitatively examined by comparing the fragility curves corresponding to various . Furthermore, a fast seismic damage assessment method is proposed for efficiently evaluating the performance of FSSPs buried in various offshore soil conditions. This approach proves beneficial for designers and decision‐makers, enabling accurate estimation of seismic damage and facilitating the implementation of post‐earthquake maintenance measures for FSSPs.

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Seismic risk assessment and hotspots prioritization: a developing country perspective

et al. 2023

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Natural disasters pose a negative impact not only on human lives but also on infrastructures such as healthcare systems, supply chains, logistics, manufacturing, and service industries. The frequency of such calamities has grown over time, which not only poses a threat to human survival and the living environment but is also detrimental to the economic growth and sustainable development of society. Earthquakes cause the most destruction compared to other natural disasters, especially in developing countries where the conventional reactive approach to dealing with disasters gives less chance for the appropriate utilization of already limited resources. Additionally, mismanagement of the resources and the lack of a unified action plan hinder the purpose of helping the grieving population. Considering the foregoing, this study presents a methodology for identifying hotspots and helping prioritize pre- and post-disaster management action by conducting a thorough seismic risk assessment while taking into consideration the case of a developing country as its focus. This methodology allows for rapid risk assessment against any given scenario by providing quantitative estimates of the repercussions such as physical damage to the buildings, casualties including injuries, economic losses, displaced households, debris, shelter requirements, and hospital functionality. In short, it could help prioritize actions with greater impacts and serve as a foundation for the formulation of policies and plans intended to increase the resilience of a resource-constrained community. Thus, the findings can be utilized by government agencies, emergency management organizations, non-government organizations, and aiding countries as a decision support tool.

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Analytical fragility curves for assessment of the seismic vulnerability of HP/HT unburied subsea pipelines

Cited by 27 publications

References 41 publications

Soil Structure Interaction Effects on Stability of HP/HT Unburied Subsea Pipelines Using a Probabilistic-Based Approach

Soil Structure Interaction Effects on Stability of HP/HT Unburied Subsea Pipelines Using a Probabilistic-Based Approach

Impact of local site conditions on seismic performance of free‐spanning submarine pipelines: Underwater shaking table tests and numerical simulations

Seismic risk assessment and hotspots prioritization: a developing country perspective

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