Interactive Buckling Tests of Pressurized Ring-Stiffened Pipelines under Non-Uniform Bending

Hoseinzadeh, V.; Showkati, Hossein

doi:10.3850/978-981-08-9247-0_rp089-icsas11

Cited by 1 publication

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“…Procedures for processing the test results to verify both the buckling load and the modes of buckling have also been presented. The noticeable concluding tips are as follows [9]: • With using ring stiffeners along the length of pipeline, because of section ovalization controlling, the structure behavior against the combination of bending moment and external pressure is improved in all loading paths. • In pressurizing stiffened bent pipeline, buckling mode is affected by the uniform external pressure and failure mode in all cases is in the form of three circumferential waves.…”

Section: Discussionmentioning

confidence: 99%

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Interactive Buckling Tests of Externally Pressurized Stiffened Bent Pipelines

Hoseinzadeh

Showkati

2013

KEM

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The paper reports an experimental study on the collapse of long uniformly pressurized ring-stiffened bent pipelines. Bending in the presence of external pressure is experienced by pipelines during their installation and operation. The buckling aptitude of shells is dependent on two leading geometric ratios, i.e. the length to radius and radius to thickness. In this paper, four different ring-stiffened steel pipeline specimens were tested to collapse. The evolution of the specimens behavior that has been recorded in the presence of a uniform external pressure is outlined. A thin-walled pipeline is sensitive to buckling phenomena when it experiences locally a compressive stress. It is often considered that its behavior under bending is rather similar to pure compression, but very few are the experimental investigations that precise the real behavior of it. A comparison of experimental data to empirical formulae and design recommendations is finally achieved. Consequently, it has been found that with using ring stiffeners the structure behavior against the combination of loads is improved in all loading paths. Also it has been found that buckle propagation in all manners occurs suddenly and dynamically and the amount of initial bending moment is not serious in defining the number of buckling modes. Also, the considerable effects of a longitudinal spot weld line on the buckling strength and mode shapes are verified.

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Section: Discussionmentioning

confidence: 99%

“…The full guide and explanation to this machine has been presented in another project report and is not the issue of concern in this study. [9] Figure 2: Photograph view of test rig.…”

Section: Advanced Computational Engineering and Experimenting IImentioning

confidence: 99%