Influence of axial boundary conditions on free spanning pipeline natural frequencies
The effect of axial restraint (boundary conditions) on the natural frequency of a free spanning pipeline is examined in this paper. Theoretical calculation of the natural frequency of a straight pipeline with simple boundary conditions is a trivial task with exact solutions being available. A pipeli...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Conference Paper |
| Published: |
ASME
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/36912 |
| _version_ | 1848754902845620224 |
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| author | Forbes, Gareth Reda, Ahmed |
| author2 | ASME |
| author_facet | ASME Forbes, Gareth Reda, Ahmed |
| author_sort | Forbes, Gareth |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The effect of axial restraint (boundary conditions) on the natural frequency of a free spanning pipeline is examined in this paper. Theoretical calculation of the natural frequency of a straight pipeline with simple boundary conditions is a trivial task with exact solutions being available. A pipeline lying on the seabed however is neither completely straight and the interaction with the soil at the span shoulders create more complex boundary conditions. DNV-RP-F105 provides guidance on the calculation of free span boundary conditions with these increased complexities. The DNV recommended practice does not however take into account the effect of the axial restraint on the natural frequency. Results are presented in this paper for a range of axial stiffness combined with span out of straightness for a free spanning pipeline. The results presented show that the effect of axial restraint for moderately out of straight free spans can cause significant deviation in the calculation of the span natural frequency. |
| first_indexed | 2025-11-14T08:47:48Z |
| format | Conference Paper |
| id | curtin-20.500.11937-36912 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:47:48Z |
| publishDate | 2013 |
| publisher | ASME |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-369122017-09-13T15:16:05Z Influence of axial boundary conditions on free spanning pipeline natural frequencies Forbes, Gareth Reda, Ahmed ASME Pipeline Spanning Axial Stiffness Curved Beam Modal Analysis Single Span Span with Out-of-Straightness Isolated Span The effect of axial restraint (boundary conditions) on the natural frequency of a free spanning pipeline is examined in this paper. Theoretical calculation of the natural frequency of a straight pipeline with simple boundary conditions is a trivial task with exact solutions being available. A pipeline lying on the seabed however is neither completely straight and the interaction with the soil at the span shoulders create more complex boundary conditions. DNV-RP-F105 provides guidance on the calculation of free span boundary conditions with these increased complexities. The DNV recommended practice does not however take into account the effect of the axial restraint on the natural frequency. Results are presented in this paper for a range of axial stiffness combined with span out of straightness for a free spanning pipeline. The results presented show that the effect of axial restraint for moderately out of straight free spans can cause significant deviation in the calculation of the span natural frequency. 2013 Conference Paper http://hdl.handle.net/20.500.11937/36912 10.1115/OMAE2013-10147 ASME restricted |
| spellingShingle | Pipeline Spanning Axial Stiffness Curved Beam Modal Analysis Single Span Span with Out-of-Straightness Isolated Span Forbes, Gareth Reda, Ahmed Influence of axial boundary conditions on free spanning pipeline natural frequencies |
| title | Influence of axial boundary conditions on free spanning pipeline natural frequencies |
| title_full | Influence of axial boundary conditions on free spanning pipeline natural frequencies |
| title_fullStr | Influence of axial boundary conditions on free spanning pipeline natural frequencies |
| title_full_unstemmed | Influence of axial boundary conditions on free spanning pipeline natural frequencies |
| title_short | Influence of axial boundary conditions on free spanning pipeline natural frequencies |
| title_sort | influence of axial boundary conditions on free spanning pipeline natural frequencies |
| topic | Pipeline Spanning Axial Stiffness Curved Beam Modal Analysis Single Span Span with Out-of-Straightness Isolated Span |
| url | http://hdl.handle.net/20.500.11937/36912 |