Effective axial forces in offshore lined and clad pipes

Vedeld, Knut; Sollund, Håvar A.; Hellesland, Jostein; Fyrileiv, Olav

doi:10.1016/j.engstruct.2014.01.051

Cited by 28 publications

(10 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increase of temperature and inner pressure are the main factors triggering upheaval buckling. However, the triggering mechanism of inner pressure is more complicated than temperature (Knut Vedelda et al, 2014). The increase of temperature is selected to be the loading method, which simplifies the problem.…”

Section: Create Fe Modelsmentioning

confidence: 99%

Static and dynamic analysis on upheaval buckling of unburied subsea pipelines

et al. 2015

View full text Add to dashboard Cite

Section: Create Fe Modelsmentioning

confidence: 99%

Static and dynamic analysis on upheaval buckling of unburied subsea pipelines

et al. 2015

View full text Add to dashboard Cite

“…As far as a connected beam is concerned, one has to consider the previous integral (Equation (10)) in the global bifurcation equation together with a special term for the contribution of the connectors, which will be formulated later.…”

Section: Theoretical Formulationmentioning

confidence: 99%

“…In this framework, the concept of effective axial force has been therefore introduced so as to integrate in a simplified way the combined effects of the thermal expansion and the internal/external pressures, without involving any complex integral on the double-curved surface of the pipe due to pressures, what allows one to deal easily with global buckling, for instance. For detailed derivations of this controversial but widely used effective axial force, please refer to researchers such as Palmer and Baldry [8], Fyrileiv and Collberg [9] and Vedeld et al [10], or to engineering standards (DNV).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Torsional Effects on the Lateral Buckling of a Pipe-Like Beam Resting on the Ground under Axial Compression

Grognec

Nême

Cai

2020

Int. J. Str. Stab. Dyn.

View full text Add to dashboard Cite

This paper deals with the lateral buckling behavior of an axially compressed beam interacting with the ground on which it is resting. Such a simple model is supposed to reproduce the same trends as observed during the lateral buckling of offshore pipelines on the seabed. In such practical analyses, the pipe-soil interaction relates the ground to the neutral axis of the pipeline. It is shown that, although such a constraint significantly affects the buckling behavior of the pipeline, it cannot reflect the torsional component of the buckling modes. However, this component is encountered in practice and may further modify the critical loads. Therefore, in this present preliminary study, the interaction between the beam in hand and the surrounding ground is modeled by a connection (a continuous distribution of lateral springs) related to the bottom line of the beam. In this way, the real contact between the soil and the bottom line of a pipe is mimicked, allowing for both flexural and torsional deformations in the buckling response. The problem is investigated analytically using an Euler–Bernoulli beam model with an isotropic linear elastic constitutive law and also an elastic interaction law. Original analytical solutions are derived and compared to numerical results obtained through finite element computations. In comparison with classical solutions (with the connection related to the neutral axis), new types of buckling modes may appear when considering torsional effects, depending on the boundary conditions, with generally much lower critical loads. These first results are certainly representative of some features of the global/localized lateral buckling of offshore pipelines, indicating that torsional effects should also be taken into account in such more comprehensive analyses.

show abstract

“…In DNV standards (DNV 2007(DNV , 2013a, it has been defined as the effective axial force S eff and expressed as Equation ( 1), where N is the true wall axial force, A i and A e are pipe crosssectional areas under internal pressure and external pressure, respectively, p i is the internal pressure and p e is the external pressure. Many researchers such as Carr et al (2003), Galgoul et al (2004), Fyrileiv and Collberg (2005) and Vedeld et al (2014) have argued against this concept because it is somewhat counter-intuitive. For instance, based on this definition, a closed pipe segment subjected to internal pressure could buckle when the pressure builds up.…”

Section: Category Of Pipe Loadsmentioning

confidence: 99%

Residual ultimate strength of offshore metallic pipelines with structural damage – a literature review

Cai

Jiang

Lodewijks

2017

Ships and Offshore Structures

View full text Add to dashboard Cite

The latest research progress on residual ultimate strength of metallic pipelines with structural damage is presented through literature survey. The investigated pipe diameter-to-thickness ratios majorly lie between 20 and 50, which are typically applicable in deep water. Influential parameters in terms of pipe load, installation process and material that affect the ultimate strength of pipes are categorised. Structural damage including dent, metal loss and crack is identified and efforts are made to summarise critical damage factors such as dent length and crack depth. Furthermore, research and prediction methods on pipe residual ultimate strength in terms of experimental tests, numerical simulations and analytical predictions are summarised and discussed. Specific details on how to introduce, simplify and simulate structural damage are presented and discussed. It is expected that the mechanism of residual ultimate strength of metallic pipes with structural damage can be clarified through this study so that guidance will be provided for researchers in this field.

show abstract

Effective axial forces in offshore lined and clad pipes

Cited by 28 publications

References 11 publications

Static and dynamic analysis on upheaval buckling of unburied subsea pipelines

Static and dynamic analysis on upheaval buckling of unburied subsea pipelines

Investigation of the Torsional Effects on the Lateral Buckling of a Pipe-Like Beam Resting on the Ground under Axial Compression

Residual ultimate strength of offshore metallic pipelines with structural damage – a literature review

Contact Info

Product

Resources

About