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• W2074907486 abstract "Hydrodynamic Interaction Effects On The Cylindrical Legs Of Deepwater Platforms C.Y. Liaw; C.Y. Liaw PMB, Inc. Search for other works by this author on: This Site Google Scholar R.B. Reimer R.B. Reimer PMB, Inc. Search for other works by this author on: This Site Google Scholar Paper presented at the Offshore Technology Conference, Houston, Texas, May 1975. Paper Number: OTC-2324-MS https://doi.org/10.4043/2324-MS Published: May 04 1975 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Liaw, C.Y., and R.B. Reimer. Hydrodynamic Interaction Effects On The Cylindrical Legs Of Deepwater Platforms. Paper presented at the Offshore Technology Conference, Houston, Texas, May 1975. doi: https://doi.org/10.4043/2324-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsOffshore Technology ConferenceOTC Offshore Technology Conference Search Advanced Search ABSTRACTBy examining three different analytical approaches to the problem of hydrodynamic interaction of cylindrical leg structures in water, the limitations of the simple added mass concept are determined in terms of geometry and the characteristics of the dynamic excitation. Three cylindrical leg configurations are considered including prismatic, tapered and stepped cylindrical shapes. The excitations considered include wave forces and earthquake ground motions.It is concluded that the simplest added mass approach is most applicable to slender legged structures subjected to low frequency excitation. For other cases, including less slender legs or legs with complex lateral restraining systems, the more sophisticated approach presented should be utilized, especially if earthquake excitations are to be considered.1. INTRODUCTIONThe commonly applied added-mass approach for consideration of hydrodynamic interaction effects on offshore platforms is based on several simplifying assumptions which include neglecting structural deformations when defining the mass to be added to the structure's legs. The limitations of this approach are not widely known and with more and more unique structural configurations built and proposed for deepwater locations, the range of applicability of current techniques should be understood.In terms of computational effort, the additional work required to substantially improve the prediction of hydrodynamic interaction effects on offshore structures is not significant. However, the primary purpose of a more sophisticated analytical approach should, if possible, be to delineate tile limits of applicability of simpler techniques. The use of simpler techniques can then continue providing, of course, that their accuracy is not substantially inferior to that of the more sophisticated approach within these limits.The objective of the present study has been to identify and review the major assumptions involved in the popular added mass concept and, by means of a more sophisticated analysis, show the limits of its applicability for a class of representative structural configurations. The motivation for the study has been the recent dramatic changes in offshore platform design concepts, including gravity type structures, and the increased importance of the dynamic behavior of platforms in the deep water leases now being developed.2. DYNAMIC BEHAVIOR OF STRUCTURES IN WATERThe basic difference between the dynamic behavior of structures immersed in water and those on land is due to the effect of water on the structures mass and damping characteristics. Both of these characteristics may be related to hydrodynamic pressure from the surrounding water acting on the vibrating structure. Depending on whether the hydrodynamic pressure is ;n or out of phase with, respect to the periodic acceleration of the structure, the dynamic effects may be equivalent to modification of the mass only or both the mass and the damping characteristics of the structure. The mathematical solutions for hydrodynamic pressure on several different types of structures have been produced and are available [1–7].One of the few cases in which a mathematical solution can be conveniently obtained is for cylindrical structures surrounded by water. Keywords: hydrodynamic force, interaction effect, water mass, frequency, hydrodynamic interaction effect, modal participation factor, dynamic excitation, hydrodynamic effect, characteristic, structural mode This content is only available via PDF. 1975. Offshore Technology Conference You can access this article if you purchase or spend a download." @default.
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• W2074907486 title "Hydrodynamic Interaction Effects On The Cylindrical Legs Of Deepwater Platforms" @default.
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