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Title |
Design comparison of Fixed Offshore Structures Designed by WSD and LRFD Methods
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Authors |
정배근(Bae-Keun Jeong) ; 조두용(Doo-Yong Cho) |
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DOI |
https://doi.org/10.11112/jksmi.2023.27.2.42 |
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Keywords |
자켓구조물; 구조해석; 설계기준; 허용응력설계법(WSD); 하중저항계수 설계법(LRFD) Jacket structure; Structural analysis; Design criteria; Allowable stress design method (WSD); Load resistance coefficient design method (LRFD) |
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Abstract |
When designing fixed jacket structures, overseas design standards are applied due to the absence of domestic design methods. Althoughthe US API standards are mainly applied, API RP 2A suggests two design methods: the allowable stress design method (WSD) and the load resistancecoefficient method (LRFD), and is applied according to the designer's judgment. In this study, the stress ratio of the two design methods was reviewedand compared using SACS, an analysis program dedicated to marine structures, for fixed marine structures actually installed on the domestic coast. As a result of the review, it was found that the LRFD design method showed a greater stress ratio for extreme load analysis and transportation analysis,and the WSD design method showed a greater stress ratio for loading and lifting. Therefore, when applying the design method, it is consideredappropriate to select the final design method considering safety and economic feasibility after conducting an applicability review for the two designmethods.
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