Ultimate bending capacity of spiral-welded steel tubes – Part II: Predictions

Vasilikis, Daniel; Karamanos, Spyros A.; Es, S.H.J. van; Gresnigt, A.M.

doi:10.1016/j.tws.2015.11.025

Cited by 37 publications

(27 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The principal dimensions of pipe model for the following parameter studies are summarised in Table 1. Initial imperfection in terms of a wave-type (wrinkling) is accounted for in this model based on a similar pipe research by Es et al (2016) and Vasilikis et al (2015). The imperfection is obtained from a standard eigenvalue simulation of a pipe, in the form of its firstorder buckling mode with an amplitude of 0.01t (typical value from 0.01t to 0.12t as reported in Es et al 2016).…”

Section: Finite Element Modelmentioning

confidence: 98%

Numerical investigation of residual ultimate strength of dented metallic pipes subjected to pure bending

Cai

Jiang

Lodewijks

2018

Ships and Offshore Structures

View full text Add to dashboard Cite

A dent is one of the main structural damages that may affect ultimate strength. In this paper, the residual ultimate strength of dented metallic pipes subjected to a bending moment is quantitatively investigated. The numerical model is developed accounting for the variation of the dent length (l d ), dent depth (d d ), dent width (w d ), dent rotation angle (θ d ) and dent location based on ABAQUS Python. The numerical model is validated by test results from a four-point bending test. Subsequently, a parametric investigation is performed on the effects of wave-type initial imperfection, D/t and dent geometrical parameters. It is found that both l d and d d have a significant effect on the residual ultimate strength of dented metallic pipes, while the effect of w d is slight. Finally, an empirical formula with respect to l d and d d has been proposed for the prediction of bending moment, which can be deployed for practical purposes.Nomenclature κ the curvature of pipe (1/m) κ 0 the referential curvature of pipe (1/m) κ cr the critical curvature of pipe (1/m) λ l normalised dent length λ w normalised dent width λ cl critical half-wavelength ω dent depth variation (mm) σ u material ultimate tensile strength (MPa) σ y material yielding strength (MPa) σ 11 stress component in pipe axial direction (MPa) σ 22 stress component in pipe hoop direction (MPa) σ eng engineering stress of material (MPa

show abstract

Section: Finite Element Modelmentioning

confidence: 98%

Numerical investigation of residual ultimate strength of dented metallic pipes subjected to pure bending

Cai

Jiang

Lodewijks

2018

Ships and Offshore Structures

View full text Add to dashboard Cite

show abstract

“…In this paper, denoted as Part I, the experimental testing and corresponding results are presented in detail. The companion paper by Vasilikis et al [30], referred to as Part II, reports the numerical simulation of the experimental procedure and an extensive parametric numerical study. The pair of papers are aimed at providing a comprehensive overview of the bending behavior of large-diameter spiral-welded tubes.…”

Section: Figurementioning

confidence: 99%

“…For tubes featuring a coil connection weld or girth weld, the occurrence of imperfections at these welds dictated the tube orientation during the bending test. For numerical analysis of the bending tests, the measured initial geometry will be used to provide a realistic range of imperfection amplitudes in the numerical models, as described in the companion paper [30].…”

Section: Measurements Of Initial Imperfectionsmentioning

confidence: 99%

“…This is attributed to the fact that the wavy imperfections may be the result of the manufacturing process. As described in chapter 2 and modeled in Part II [30], spiral-welded tubes are cold formed by means of a three-roller system that bends the steel coil. Should these rollers be not continuous but discrete, a series of discrete imperfections may be the result, as seen in Figure 16.…”

Section: Ovalisation (F) [-]mentioning

confidence: 99%

“…The overall geometrical imperfection can mostly be described by one measurement, similarly as has been performed for the plain tube sections. For reasons of efficient numerical modelling all imperfections of the tubes containing a girth weld or coil connection weld are documented as such [30]. A collection of the depths of these imperfections at the location of the local buckle is presented in Table 4.…”

Section: A Comparison Of Initial Imperfections At Girth Welds Is Depimentioning

confidence: 99%

See 2 more Smart Citations

Ultimate bending capacity of spiral-welded steel tubes – Part I: Experiments

Gresnigt

Vasilikis

et al. 2016

Thin-Walled Structures

Self Cite

View full text Add to dashboard Cite

The present investigation refers to the bending capacity of spiral-welded steel tubes. The first part of this investigation presents the results of a full-scale experimental program, aiming to investigate the structural behavior of large-diameter spiral-welded steel tubes under bending. A companion paper (Part II) is also published which further studies the behavior of these elements numerically, using finite element simulations.The testing program presented in Part I consists of thirteen 42-inch-diameter spiral-welded steel tubes with D/t ranging between 65 and 120. Some of the tubular specimens contain girth welds and coil connection welds, which are shown to penalize the ultimate bending capacity of the tubes. Extensive measurements of initial imperfections and material properties are performed for each tubular specimen. The material properties of the specimens are investigated through both uniaxial tensile and compression coupon tests. A series of large-scale four-point bending tests is performed to determine the structural behavior of the tubes, resulting in local buckling failure of the tubes under consideration.The bending behavior of the thirteen specimens is documented extensively. The study offers information with regard to the ultimate bending resistance of the specimens. In addition, the full moment-curvature equilibrium path is presented, supplemented by measurements on the development of cross sectional ovalisation and tube wall wrinkling during the bending tests.

show abstract

04.15: New design rules for tubes in combined walls in EN1993‐5

Gresnigt

Karamanos

et al. 2017

ce papers

Self Cite

View full text Add to dashboard Cite

Steel tubes can be applied for many applications, structural as well as in pipelines. They may be loaded by combinations of internal or external pressure, soil load, bending moment and normal force. Important failure modes are local buckling, severe ovalisation (flattening of the cross section) and rupture of the pipe wall at local buckles or welds. Within the framework of a European research project called Combitube sponsored by RFCS (Research Fund for Coals and Steel), the structural behaviour of spiral-welded tubes for application in combined walls has been investigated. The main loads are bending moment, normal force, soil loads and loads from the infill sheeting. Analytical models were developed to predict the elastic-plastic behaviour under these loads, i.e. the bending moment curvature diagram, the curvature ovalisation diagram and curvature strain diagrams. The analytical models as presented in this paper are an extension of previous analytical models developed for pipelines, now including more parameters that influence the load deformation behaviour, in particular local buckling. The new rules are intended for the new version of EN1993-5 on Piling. They are validated with the results of full scale tests and extensive parameter studies.

show abstract

Ultimate bending capacity of spiral-welded steel tubes – Part II: Predictions

Cited by 37 publications

References 15 publications

Numerical investigation of residual ultimate strength of dented metallic pipes subjected to pure bending

Numerical investigation of residual ultimate strength of dented metallic pipes subjected to pure bending

Ultimate bending capacity of spiral-welded steel tubes – Part I: Experiments

04.15: New design rules for tubes in combined walls in EN1993‐5

Contact Info

Product

Resources

About