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This report deals with the use of suction anchors as an anchoring system for floating offshore constructions. Previous litterature and experience concerning the physical aspects of installation and load capacity during employment are evaluated, and a modeltest program is developed on this basis. The water flow conditions in the suction anchor and its influence on the down suction during installation are theoretically examined (finite element method); these results are compared with observations from down suction of model anchors as well as with available published information. Tests are at first carried out by subjecting the anchors to a static pull. Thereafter the tests are repeated under identical experimental conditions using a harmonically oscillating traction on the anchor. The purpose of this approach is to elucidate possible variation in horizontal ultimate bearing capacities between the two types of loads. Test results are given in the report in the form of load-displacement diagrams that illustrate relationships between applied horizontal force and horizontal displacements. It is evident from these diagrams that the estimated horizontal ultimate bearing capacity for suction anchors in sand is equally large for the two types of applied forces. Supplementary model tests have been carried out using an 0.1 m anchor in clay and kaolin. Load-displacement curves from these investigations show a clear difference in horizontal ultimate bearing capacity between the two types of stress. The ultimate bearing capacity for experiments conducted using oscillating load on suction anchors in clay and kaolin is estimated to be only half the ultimate bearing capacity for static load. 31 refs. (ERA citation 13:037417)
This report deals with the use of suction anchors as an anchoring system for floating offshore constructions. Previous litterature and experience concerning the physical aspects of installation and load capacity during employment are evaluated, and a modeltest program is developed on this basis. The water flow conditions in the suction anchor and its influence on the down suction during installation are theoretically examined (finite element method); these results are compared with observations from down suction of model anchors as well as with available published information. Tests are at first carried out by subjecting the anchors to a static pull. Thereafter the tests are repeated under identical experimental conditions using a harmonically oscillating traction on the anchor. The purpose of this approach is to elucidate possible variation in horizontal ultimate bearing capacities between the two types of loads. Test results are given in the report in the form of load-displacement diagrams that illustrate relationships between applied horizontal force and horizontal displacements. It is evident from these diagrams that the estimated horizontal ultimate bearing capacity for suction anchors in sand is equally large for the two types of applied forces. Supplementary model tests have been carried out using an 0.1 m anchor in clay and kaolin. Load-displacement curves from these investigations show a clear difference in horizontal ultimate bearing capacity between the two types of stress. The ultimate bearing capacity for experiments conducted using oscillating load on suction anchors in clay and kaolin is estimated to be only half the ultimate bearing capacity for static load. 31 refs. (ERA citation 13:037417)
Suction Anchors. Anchoring System for Floating Offshore Structures
P. Larsen (author)
1988
82 pages
Report
No indication
English
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