Abstract
Free spans or suspended spans normally occur in subsea pipelines due to the irregularity of seabed and/or the scouring action
of sea water. A problem of significance to the free spans of subsea pipeline is that currents or waves flowing across pipelines
can shed vortices and induce vibration which may cause fatigue damage to the pipelines. Natural frequencies of free spans are
required when solving vibration amplitude and cyclic stresses in the free span. The natural frequency is usually calculated with
simplified equations, where factors such as boundary conditions and axial forces are not accurately taken into account. In this
study, the influence of boundary conditions, mass of hydrocarbon products, axial force, and multiple spans on the natural
frequencies of pipeline are investigated and corresponding suggestions are provided for frequency calculation.
Original language | English |
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Pages (from-to) | 81 - 89 |
Number of pages | 9 |
Journal | International Journal of Steel Structures |
Volume | 10 |
Issue number | 1 |
Publication status | Published - 2010 |