05.28: Deformation capacity of steel column under combined loading: Compressive axial force with double curvature bending moment

The most essential pipeline design criterion is, of course, the pressure containment or bursting criterion normally determining the pipe wall thickness. When the pressure containment is ensured, the concern is often towards the action of the combined loading; pressure, axial force and bending moment. The combined loading criterion typically governs the installation and also set up requirements for other design issues such as seabed intervention and global buckling. The combined loading criterion of DNV GL submarine pipeline systems standard, DNV-OS-F101 or DNVGL-ST-F101 which is its new name [1], has been modified several times, and the current version was introduced in its present form in the 2007 revision of the offshore pipeline standard. This paper discusses the current criterion for combined loading, i.e. bending moment capacity, when the pipeline is under influence of axial force and internal over-pressure. The criterion is compared with several other similar criteria from previous revisions of the DNV GL pipeline and riser standards and from other offshore pipeline standards. In addition a comparison with physical and numerical tests is given, while the background and derivation of the criterion are given in an accompanying paper by Collberg and Levold [2].

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SEISMIC PERFORMANCE EVALUATION OF HOLLOW SPIRAL STEEL PIPES UNDER COMPRESSIVE AXIAL FORCE AND BENDING MOMENT

Doboku Gakkai Ronbunshuu F ◽

10.2208/jscejf.66.301 ◽

2010 ◽

Vol 66 (2) ◽

pp. 301-318

Author(s):

Kiyoshi ONO ◽

Atsushi YABUMOTO ◽

Mitsuyoshi AKIYAMA ◽

Shohei ONISHI ◽

Masahiro SHIRATO ◽

...

Keyword(s):

Performance Evaluation ◽

Seismic Performance ◽

Axial Force ◽

Bending Moment ◽

Seismic Performance Evaluation ◽

Steel Pipes ◽

Compressive Axial Force

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An Analysis of the Collapse Strength of Down-Hole Tubings Loaded by Axial Compressive Forces and Bending Moment

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.268-270.733 ◽

2012 ◽

Vol 268-270 ◽

pp. 733-736

Author(s):

Jiang Wen Xu ◽

Hao Zhang ◽

Yi Hua Dou ◽

Xiao Zeng Wang

Keyword(s):

Axial Force ◽

Bending Moment ◽

Well Testing ◽

Axial Forces ◽

Collapse Strength ◽

Axial Tensile ◽

Tensile Forces ◽

Bending Loads ◽

Compressive Axial Force

Due to collapses of tubings during well testing and completing in HPHT wells, it is required by Petrochina officially to calculate and analysis the collapse strength of down hole tubings with axial forces and corresponding bending moment being taken into considerations. Based on the 4th strength theorem, formulas were derived and method was present to analyze the collapse strength of down hole tubings loaded by compressive axial forces and bending moment to fulfill the official requirements, which could not be accomplished according to published standards and references. And, influences of axial tensile forces, compressive forces and bending loads on the collapse strengths of down hole tubings were studied. It is found that the collapse strength of down hole tubing loaded by compressive axial force is smaller with compressive axial force and buckling bending moment taking into considerations. The bigger the compressive axial forces, the smaller the collapse strengths.

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