American Society of Civil Engineers

Testing and Analysis of Steel Pipes under Bending, Tension, and Internal Pressure

by Istemi F. Ozkan, (Grad. Res. Asst., Dept. of Civ. Engrg., Univ. of Ottawa, Ottawa ON, Canada K1N 6N5) and Magdi Mohareb, M.ASCE, (Assoc. Prof. of Civ. Engrg., Univ. of Ottawa, Ottawa ON, Canada K1N 6N5)

Journal of Structural Engineering, Vol. 135, No. 2, February 2009, pp. 187-197, (doi:

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Document type: Journal Paper
Abstract: This paper reports a full-scale experimental program consisting of six pipe specimens made of X65 material (specified minimum yield strength=448 MPa) with 508 mm outer diameter, and a diameter-to-thickness ratio (D/t) of 81.2 subjected to combinations of bending, axial tension, and internal pressure. The study is aimed at determining whether the pipes are able to attain their modified plastic moment as predicted by analytically derived plastic interaction relations. The moment versus curvature relations, peak moment values, and local buckling behavior of the specimens as obtained from the experiments are documented. The peak moments obtained are compared to the analytically predicted moments. A nonlinear shell finite-element model is also developed using the finite-element analysis (FEA) simulator ABAQUS in order to predict the moment capacity and the local buckling behavior. Test results compare well with FEA results. It is observed that under certain combinations of axial tension and internal pressure, pipes with D/t=81.2 are able to attain their plastic moment resistances.

ASCE Subject Headings:
Full-scale tests
Internal pressure
Finite element method
Steel pipes