Author(s): Egon Wessels
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Keywords: No Keywords
Abstract: A comprehensive model test program was carried out under use of low salinity model ice at HSVA's ice model basin within the international joint venture COSMAR (Concrete Structures for Marine Production, Storage and Transportation of Hydrocarbons). The objective of the test program was to investigate the influence of the following main parameters of structural conditions as well as of ice conditions on the ice forces exerted on conical structures: - cone angle - cone diameter at waterline - structural breaking mode - friction coefficient between ice and cone surface - velocity of ice/structure interaction - ice thickness. One hundred fifty-two model tests were performed in a three-part program investigating the interaction between ice and - upward breaking fixed cones, - downward breaking fixed cones, - downward breaking floating cones. During all tests the forces and moments exerted by ice onto the conical structures were continuously recorded by means of a six component balance. The test program included level ice tests as well as pressure ridge tests. By variation of the breaking mode, a decrease of 70% in the horizontal peak force of unconsolidated ridges was determined when the upward breaking fixed cone was changed to a downward breaking fixed cone and another 40% decrease was gained when the downward breaking cone was used in a moored, floating mode. The results of the level ice model tests were compared with predictions derived' from different analytical methods.
Year: 1984