A Study on the Holding Capacity Safety Factors for Torpedo Anchors
The use of powerful numerical tools based on the finite-element method has been improving the prediction of the holding capacity of fixed anchors employed by the offshore oil industry. One of the main achievements of these tools is the reduction of the uncertainty related to the holding capacity cal...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | Journal of Applied Mathematics |
| Online Access: | http://dx.doi.org/10.1155/2012/102618 |
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| author | Luís V. S. Sagrilo José Renato M. de Sousa Edison C. P. Lima Elisabeth C. Porto Jane V. V. Fernandes |
| author_facet | Luís V. S. Sagrilo José Renato M. de Sousa Edison C. P. Lima Elisabeth C. Porto Jane V. V. Fernandes |
| author_sort | Luís V. S. Sagrilo |
| collection | DOAJ |
| description | The use of powerful numerical tools based on the finite-element method has been improving the prediction of the holding capacity of fixed anchors employed by the offshore oil industry. One of the main achievements of these tools is the reduction of the uncertainty related to the holding capacity calculation of these anchors. Therefore, it is also possible to reduce the values of the associated design safety factors, which have been calibrated relying on models with higher uncertainty, without impairing the original level of structural safety. This paper presents a study on the calibration of reliability-based safety factors for the design of torpedo anchors considering the statistical model uncertainty evaluated using results from experimental tests and their correspondent finite-element-based numerical predictions. Both working stress design (WSD) and load and resistance factors design (LRFD) design methodologies are investigated. Considering the WSD design methodology, the single safety is considerably lower than the value typically employed in the design of torpedo anchors. Moreover, a LRFD design code format for torpedo anchors is more appropriate since it leads to designs having less-scattered safety levels around the target value. |
| format | Article |
| id | doaj-art-00833d1e28484ee5a3004c4ff8a1de81 |
| institution | Kabale University |
| issn | 1110-757X 1687-0042 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Applied Mathematics |
| spelling | doaj-art-00833d1e28484ee5a3004c4ff8a1de812025-02-03T01:02:57ZengWileyJournal of Applied Mathematics1110-757X1687-00422012-01-01201210.1155/2012/102618102618A Study on the Holding Capacity Safety Factors for Torpedo AnchorsLuís V. S. Sagrilo0José Renato M. de Sousa1Edison C. P. Lima2Elisabeth C. Porto3Jane V. V. Fernandes4Laboratory of Analysis and Reliability of Offshore Structures, Civil Engineering Department, Centro de Tecnologia, COPPE/UFRJ, Cidade Universitária, Bloco I-2000, Sala I-116, Ilha do Fundão, 21945-970 Rio de Janeiro, RJ, BrazilLaboratory of Analysis and Reliability of Offshore Structures, Civil Engineering Department, Centro de Tecnologia, COPPE/UFRJ, Cidade Universitária, Bloco I-2000, Sala I-116, Ilha do Fundão, 21945-970 Rio de Janeiro, RJ, BrazilLaboratory of Analysis and Reliability of Offshore Structures, Civil Engineering Department, Centro de Tecnologia, COPPE/UFRJ, Cidade Universitária, Bloco I-2000, Sala I-116, Ilha do Fundão, 21945-970 Rio de Janeiro, RJ, BrazilPETROBRAS Research and Development Center (CENPES), Cidade Universitária, Quadra 7, Ilha do Fundão, 21949-900 Rio de Janeiro, RJ, BrazilPETROBRAS Research and Development Center (CENPES), Cidade Universitária, Quadra 7, Ilha do Fundão, 21949-900 Rio de Janeiro, RJ, BrazilThe use of powerful numerical tools based on the finite-element method has been improving the prediction of the holding capacity of fixed anchors employed by the offshore oil industry. One of the main achievements of these tools is the reduction of the uncertainty related to the holding capacity calculation of these anchors. Therefore, it is also possible to reduce the values of the associated design safety factors, which have been calibrated relying on models with higher uncertainty, without impairing the original level of structural safety. This paper presents a study on the calibration of reliability-based safety factors for the design of torpedo anchors considering the statistical model uncertainty evaluated using results from experimental tests and their correspondent finite-element-based numerical predictions. Both working stress design (WSD) and load and resistance factors design (LRFD) design methodologies are investigated. Considering the WSD design methodology, the single safety is considerably lower than the value typically employed in the design of torpedo anchors. Moreover, a LRFD design code format for torpedo anchors is more appropriate since it leads to designs having less-scattered safety levels around the target value.http://dx.doi.org/10.1155/2012/102618 |
| spellingShingle | Luís V. S. Sagrilo José Renato M. de Sousa Edison C. P. Lima Elisabeth C. Porto Jane V. V. Fernandes A Study on the Holding Capacity Safety Factors for Torpedo Anchors Journal of Applied Mathematics |
| title | A Study on the Holding Capacity Safety Factors for Torpedo Anchors |
| title_full | A Study on the Holding Capacity Safety Factors for Torpedo Anchors |
| title_fullStr | A Study on the Holding Capacity Safety Factors for Torpedo Anchors |
| title_full_unstemmed | A Study on the Holding Capacity Safety Factors for Torpedo Anchors |
| title_short | A Study on the Holding Capacity Safety Factors for Torpedo Anchors |
| title_sort | study on the holding capacity safety factors for torpedo anchors |
| url | http://dx.doi.org/10.1155/2012/102618 |
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