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Research Papers: Design and Analysis

Analysis of Stress–Strain State in a Steel Pipe Strengthened With a Composite Wrap

[+] Author and Article Information
Oleg V. Trifonov

Research Institute for Natural Gases
and Gas Technologies (GAZPROM VNIIGAZ),
Razvilka poselok,
Leninsky district 142717, Moscow region,
Russian Federation
e-mail: O_Trifonov@vniigaz.gazprom.ru

Vladimir P. Cherniy

Research Institute for Natural Gases
and Gas Technologies (GAZPROM VNIIGAZ),
Razvilka poselok,
Leninsky district 142717, Moscow region,
Russian Federation

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 16, 2013; final manuscript received March 18, 2014; published online August 19, 2014. Assoc. Editor: Pierre Mertiny.

J. Pressure Vessel Technol 136(5), 051202 (Aug 19, 2014) (8 pages) Paper No: PVT-13-1212; doi: 10.1115/1.4027229 History: Received December 16, 2013; Revised March 18, 2014

In this paper, strengthening of a steel pipe with a composite wrap is analyzed. An analytical model taking into account joint reaction of the pipe and the wrap, two-dimensional stress state and plastic strains in the pipe wall is developed. Verification of the model is performed by comparison of the numerical results to the full-scale test results for a strengthened pipe under the action of internal pressure. The developed model is applied to the analysis of a buried gas pipeline subjected to the internal pressure and temperature loading. The results obtained with the analytical model are compared to the results of a finite-element simulation. A good agreement is established. The effect of wrap thickness on the stress–strain state and load-carrying capacity of the strengthened pipe is studied.

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References

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Figures

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Fig. 1

Equilibrium of a half-cylinder cut from the pipe under the action of the internal pressure

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Fig. 2

Uniaxial stress–strain diagram of the pipe steel (а) and composite wrap in hoop direction (b)

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Fig. 3

Steel pipe with a composite wrap under the action of internal pressure

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Fig. 4

Overall view of the wrapped pipe after the test

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Fig. 5

Comparison of the test results to the results of the analytical model for the bare pipe (curve 1) and the pipe with a composite wrap (curve 2)

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Fig. 6

Finite-element model of the pipe with a composite wrap in soil

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Fig. 7

Elastoplastic strain–pressure curves for the case ΔT = 0 (curve 1) and ΔT = 50 °C (curve 2)

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Fig. 8

Stress–pressure curves for ΔT = 0 °C (a) and ΔT = 50 °C (b)

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Fig. 9

The relationship between the wrap thickness tw and the strengthening factor Ksw

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Fig. 10

The relationship between the wrap thickness tw and the hoop strain ɛ2 for the pressure levels p = 13, 15, and 17 MPa (curves 1, 2, and 3, correspondingly)

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Fig. 11

The relationship between the wrap thickness tw and the hoop stress in steel pipe (a) and the composite wrap (b) for the pressure levels p = 13, 15, and 17 MPa (curves 1, 2, and 3, correspondingly)

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