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Research Papers: Design and Analysis

Consideration of Geometric Imperfections in Three-Dimensional Finite Element Model Analysis of Stiffened Steel Liners Subjected to External Pressure

[+] Author and Article Information
J. L. G. Valdeolivas

Hydropower Division, Gas Natural Fenosa,
C/Acanto, 11 Edificio A 1aPlanta,
Madrid 28045, Spain
e-mail: jlgarciav@gasnatural.com

J. C. Mosquera

C/Professor
Aranguren S/N,
Universidad Politécnica de Madrid.
Escuela de Ingenieros de Caminos,
Canales y Puertos,
Calle Ramiro de Maeztu, 7,
Madrid 28040, Spain

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 4, 2014; final manuscript received October 21, 2014; published online February 20, 2015. Assoc. Editor: Spyros A. Karamanos.

J. Pressure Vessel Technol 137(4), 041202 (Aug 01, 2015) (6 pages) Paper No: PVT-14-1037; doi: 10.1115/1.4028893 History: Received March 04, 2014; Revised October 21, 2014; Online February 20, 2015

The availability of tools for safety evaluation of a pressure liner is a relevant issue in both structural and hydraulic engineering. A suitable design of a steel liner may involve a significant reduction in the investment cost of a hydropower plant and may also ensure its future integrity, avoiding prolonged stoppages in the operation stage. First, a review of the design methods for steel pressure liners is outlined and certain key aspects for the critical buckling load assessment are pointed out. Second, a numerical modeling and analysis procedure of a steel pressure liner is presented. The methodology is based on 3D nonlinear finite element modeling procedures, involving both liner constraining and the effect of stiffeners. In addition, both large displacements and a surrounding elastic medium are assumed in the model. Besides, some types of geometric imperfections such as weld-induced ones, initial gap, ovality, and wall-thickness loss due to corrosion are taken into account in this work. Finally, some conclusions are drawn regarding the role of imperfections in the calculated critical pressure of a steel liner.

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Figures

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Fig. 1

Schematic geometrical layout of a pressure steel liner. (nonuniform gap is considered between 0.0 and the g/R maximum value)

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Fig. 2

View of the erection of a 4.5-m-diameter stiffened steel liner in a hydropower pressure tunnel (Kazakhstan, 2011)

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Fig. 3

3D FE model of stiffened steel liner: 40 frame-type elements along half-circumference to modeling stiffener

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Fig. 5

Influence of both initial gap and D/t ratio on the critical pressure

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Fig. 6

View of a weld execution in a pressure tunnel of hydroelectric power plant. (Kazakhstan, 2011)

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Fig. 7

View of a weld-induced imperfection implemented into the model

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Fig. 8

Geometrical weld-induced imperfection considered (x is measure in longitudinal direction)

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Fig. 9

Critical pressure reduction factor versus amplitude of the imperfection (wo) for different D/t ratios

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Fig. 10

Critical pressure for several half wavelength λ and amplitude Wo of the weld-induced imperfection

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