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

ABSTRACT

The paper reports on a theoretical and an experimental study into the collapse of long uniformly pressurized ring-stiffened pipelines subjected to non-uniform in-plane bending. The influence of external pressure, initial ovality on the bifurcation moment, curvature and the corresponding wavelength, are examined. The local character of buckling in the circumferential direction is also demonstrated, especially for thin-walled pipelines. A thin-walled pressurized ring-stiffened 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 a thin pressurized ring-stiffened pipeline submitted to a bending load. Experimental models made of steel by rolling and longitudinal spot welding are presented here, obtained on thin shells of long length. The evolution of the pressurized thin-walled ring-stiffened pipelines behavior that has been recorded in the presence of non-uniform bending is outlined. A comparison of our experimental data to finite element models results, empirical formulae and design recommendations is finally achieved.

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