IN-SERVICE RESPONSE OF A COMPLIANT TOWER
After nine years of service, the first commercial compliant tower, the Lena Guyed Tower, continues to perform well as an offshore drilling and producing platform. The tower has experienced four hurricanes and a number of loop current events. Initial concerns about guyline serviceability and motion response proved to be unfounded. Data from the platform has shown that wind, current, and wave loadings were overpredicted by standard procedures of the time. The design wind and current loads were overpredicted significantly because of blockage and shielding effects. Recent model tests have verified and further quantified the reduced loadings and predictive tools have been developed to take these effects into account. The Lena wave-response overprediction is partly attributed to wave spreading. Three-dimensional waves reduced the predicted dynamic response of compliant towers by 5 to 15 per cent. Predictions of wave kinematics for three-dimensional waves were found to compare well with field data.
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Supplemental Notes:
- OMAE 1992, 11th Intl Conf on Offshore Mechanics & Arctic Engng; 7-12 June 1992; Calgary, Canada. Sponsored by ASME et al. Procs. Publ by ASME. Vol 1, Pt B, p 461 [10 p, 13 ref, 9 fig]
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Authors:
- Finn, L D
- Lambrakos, K F
- Publication Date: 1992
Language
- English
Subject/Index Terms
- TRT Terms: Arrester wires; Towers
- Uncontrolled Terms: Guyed towers
- Old TRIS Terms: Platform response; Wave loads on structures
- Subject Areas: Marine Transportation; Terminals and Facilities;
Filing Info
- Accession Number: 00704635
- Record Type: Publication
- Source Agency: British Maritime Technology
- Files: TRIS
- Created Date: Aug 14 1995 12:00AM