Abstract
When analyzing the lateral vibration of an offshore structure supported by seabed layer, the effect of this layer must be taken into consideration. In this study, first, the natural frequency of lateral vibration of the offshore structure constructed with four legs and a platform was analyzed theoretically by replacing it with the one-leg structure, the upper end of which was loaded by an axial load corresponding to the equivalent mass of a platform per leg and was constrained to move in the horizontal direction only. Furthermore, the validity of this theory was examined by the model experiment. The main results obtained are as follows：(1) The theoretical natural frequency calculated by the method replacing the 4-leg structure with one-leg structure coincides with the experimental one within the difference of 7 %, and so this method is valid even in case that the effect of seabed layer is taken into consideration.(2) In order to calculate the natural frequencies of practical offshore structures with good accuracy, the leg's axial force due to the weight of the platform must be considered, and the leg's own weight may be neglected in case of a shorter-leg structure (L ≦ 75 m in this study) but must be taken into account in case of a longer-leg one.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
