Longitudinal condition assessment of exposed pipelines encased in concrete box in a riverbed

Jong Hwa Won, Moon Kyum Kim, Young Ho Woo, Tae Min Kim, Won Joon Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Scour around a river crossing pipeline creates a free span of pipeline and leads to excessive flexural and deformation stresses. Generally, generated stresses on pipelines under high internal pressure are dominated by circumferential stress. Longitudinal stress, however, is a main contributor in the procedure of stress development because a free-span pipeline exhibits unstable behavior as a simple supported beam and results in bending stress. For this study, a specific section of river crossing pipeline was defined as follows: API 5L Gr. X65, Do=762mm (30-inch). Based on a plastic design concept, the interface stress for the steel-concrete composite pipeline and its performance under specific flow velocity were defined using results from FEM analysis. In order to describe the loading condition of the exposed encased pipelines, Prandtl-von Karman universal velocity law is adopted with rough river bed surface, fixed water depth and variable scouring depth. In the general condition of a river, although 20m free-span pipelines have been developed, encased pipelines perform well according to the von-Mises failure criterion.

Original languageEnglish
Title of host publicationProc. International Conference on Pipelines and Trenchless Technology 2009, ICPTT 2009
Subtitle of host publicationAdvances and Experiences with Pipelines and Trenchless Technology for Water, Sewer, Gas, and Oil Applications
Pages102-113
Number of pages12
DOIs
Publication statusPublished - 2009 Dec 22
EventInternational Conference on Pipelines and Trenchless Technology 2009, ICPTT 2009: Advances and Experiences with Pipelines and Trenchless Technology for Water, Sewer, Gas, and Oil Applications - Shanghai, China
Duration: 2009 Oct 182009 Oct 21

Publication series

NameProc. International Conference on Pipelines and Trenchless Technology 2009, ICPTT 2009: Advances and Experiences with Pipelines and Trenchless Technology for Water, Sewer, Gas, and Oil Applications
Volume361

Other

OtherInternational Conference on Pipelines and Trenchless Technology 2009, ICPTT 2009: Advances and Experiences with Pipelines and Trenchless Technology for Water, Sewer, Gas, and Oil Applications
CountryChina
CityShanghai
Period09/10/1809/10/21

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Civil and Structural Engineering

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  • Cite this

    Won, J. H., Kim, M. K., Woo, Y. H., Kim, T. M., & Lee, W. J. (2009). Longitudinal condition assessment of exposed pipelines encased in concrete box in a riverbed. In Proc. International Conference on Pipelines and Trenchless Technology 2009, ICPTT 2009: Advances and Experiences with Pipelines and Trenchless Technology for Water, Sewer, Gas, and Oil Applications (pp. 102-113). (Proc. International Conference on Pipelines and Trenchless Technology 2009, ICPTT 2009: Advances and Experiences with Pipelines and Trenchless Technology for Water, Sewer, Gas, and Oil Applications; Vol. 361). https://doi.org/10.1061/41073(361)11