Static and fatigue behaviour of internal replacement pipe systems subjected to surface load from vehicular traffic

PhD by Publication


Kiriella, Shanika Madhumali. 2024. Static and fatigue behaviour of internal replacement pipe systems subjected to surface load from vehicular traffic. PhD by Publication Doctor of Philosophy. University of Southern Queensland. https://doi.org/10.26192/z7713
Title

Static and fatigue behaviour of internal replacement pipe systems subjected to surface load from vehicular traffic

TypePhD by Publication
AuthorsKiriella, Shanika Madhumali
Supervisor
1. FirstProf Allan Manalo
2. SecondProf Karu Karunasena
3. ThirdDr Cam Minh Tri Tien
Institution of OriginUniversity of Southern Queensland
Qualification NameDoctor of Philosophy
Number of Pages208
Year2024
PublisherUniversity of Southern Queensland
Place of PublicationAustralia
Digital Object Identifier (DOI)https://doi.org/10.26192/z7713
Abstract

Internal replacement pipe (IRP) systems are a new and emerging trenchless technology utilised for rehabilitating legacy gas and oil pipes with circumferential cracks or discontinuities. IRP systems necessitate a design and development approach that ensures their reliable performance and durability against various types of loads throughout their service life. This thesis systematically investigated the static and fatigue behaviour of IRP systems in discontinuous host pipes under vehicular traffic loading to ensure their effective design and implementation. The first investigation involved the numerical analysis of the static bending behaviour of legacy pipes repaired with IRP systems, specifically focusing on those with full circumferential cracks or discontinuities. The influence of critical design parameters, such as width of host pipe discontinuity, thickness and elastic modulus of IRP, on the bending behaviour of pipe repair systems was investigated. A simplified and robust analytical model that can effectively capture the nonlinear lateral deformation behaviour of different IRP systems, including stand-alone IRP, IRP installed within a continuous host pipe and IRP installed within host pipes with discontinuities was also developed. In the second study, the flexural fatigue performance of IRP systems completely bonded to discontinuous host pipe segments was analysed numerically under repeated traffic loading. A comprehensive parametric study was conducted to assess the impact of important design parameters, including discontinuity width, thickness and elastic modulus of IRP, and the magnitude of the traffic loading, on the bending fatigue performance. The combined effect of the internal pressure and traffic load on the flexural fatigue behaviour of IRP systems installed in discontinuous legacy pipes was examined numerically in the third study. The last investigation was undertaken to numerically investigate the influence of bonding level on the flexural fatigue performance of IRP systems. The findings of this research provided a better understanding of the static and fatigue behaviour of IRP systems and the effect of critical design parameters on their lateral deformation behaviour and fatigue life. The numerical results, simplified analytical models, mathematical equations and design charts developed from this study will provide valuable insight for pipeline developers and designers, enabling them to enhance the safety, reliability, and cost efficiency of IRP systems.

KeywordsInternal replacement pipe; gas and oil pipelines; trenchless repair technology; composites; repetitive traffic loading; finite element analysis
Related Output
Has partLateral deformation behaviour of structural internal replacement pipe repair systems
Has partBending fatigue behaviour of internal replacement pipe systems
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400510. Structural engineering
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author/creator.

Byline AffiliationsCentre for Future Materials
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