...Robert Frederking _ The R. V. Polarstern carried out ice breaking trials in which ice forces were measured with special panels at two locations in the bow. Time series records of the ice forces for a 13-minute period were compared for differences in terms of magnitude and duration of loading...

... the performance of a vessel controlled by a dynamic positioning (DP) system in managed ice conditions at a scale of 1:40. A numerical ice dynamics model was used to simulate ice basin test conditions. The results indicate that surge direction thrust and ice force are in good agreement. Ice basin measurements...

... of the stresses and deformation of the ice cover, ice forces, and offsets of the vessel. Ice conditions and FPSO characteristics typical for the Grand Banks were used in the simulations. The results show a strong dependence of ice forces and vessel offsets on ice concentration. The roles of ice floe size and ice...

... of ice cases with the occurrence probability to predict the ice force on the structure in the Bohai Gulf. To calculate the ice force on the structure accounting for the uncertainty of the ice environments, such as the ice thickness and tensile strength, a method for determining the ice case in the Bohai...

...Ning Xu; Qianjin Yue; Dayong Zhang; Yan Qu; Shuai Yuan; Xueqin Liu; Weibin Chen Ice-induced structural vibration mainly depends on the two coefficients of dynamic ice force: amplitude and period. According to the field measurement results obtained on two jacket structures installed with composite...

...Yihe Wang; Qianjin Yue; Ning Xu; Dayong Zhang To study ice forces on jack-up legs, a series of model tests were conducted to compare ice forces on two cylindrical indenters of the same diameter, one of which has gear teeth on both sides scaled from a prototype jack-up leg, while the other has...

... by wind actions on the bridge. Limit stress and limit force events were identified. An ice loading scenario that transitioned from limit force to limit stress resulted in the highest ice forces over the three years of monitoring, with forces of 3.1 MN and 4.3 MN at P23 and P24, respectively. ISO 19906...

...Yanlin Wang; Qianjin Yue; Shigeaki Shiotani This paper reports the direct ice force measurement technology of jacket structures conducted in the Bohai Sea. Specially designed ice load panels are described in detail, including the measurement principle of the load panel, the specially designed...

...Ning Xu; Qianjin Yue; Fengwei Guo; Yan Qu The dynamic ice force and structure response of vertical and conical structures are discussed based on field measurements in Bohai Bay. It is found that significant ice-induced vibrations can occur on both kinds of structures. Adding a cone can avoid a more...

... & Gas Thickness subsea system platform experiment model test ice force seabed contact ice load horizontal ice force rubble accumulation rubble model investigation ice formation interaction investigation proc int conf port ice rubble caisson platform accumulation ice model test...

... model test Upstream Oil & Gas ice force ice ridge finite element program riser Offshore central barent sea tanker løset armoured riser Modeling & Simulation curvature impact force Gudmestad armour ice block deflection ice impact deformation International Journal...

... for estimating ice forces. Simultaneous failure is found during ductile crushing, initial hit and static loading with a drift speed/ice thickness (v/h) ratio from 0 to 0.05 l/s. Brittle crushing of level ice is found in events with v/h in the range of 0.2 to 0.4 l/s. During brittle crushing of level ice, both...

... of ice deformation and failure are observed depending on {V/h}. The boundary between these types is located at 3×10 −3 (1/s) of {V/h}. Multi-failure of an ice sheet occurs under the condition of {V/h} > 3×10 −3 (1/s), called the brittle range, and nonsimultaneous transmission of the ice force...

... akagawa pressure distribution boundary reservoir simulation ice load indentation speed coefficient ice thickness ice sheet Ice Pressure examination Upstream Oil & Gas ice force medium-scale field indentation test data Offshore model structure INTRODUCTION In progress since 1995...

... as a function of contact ratio, indentation area and ice strength. INTRODUCTION The understanding of non-simultaneous failure of an ice sheet at independent failure zones (IFZ) is important in the evaluation of indentation pressure on a wide structure in an ice-infested sea area. In general, the ice force, when...

... of measurements of ice forces on the piers, ice thick- ness, ice velocity, and observations of the failure modes of ice during its interactions with the piers. The measured ice loads were much smaller than those calculated following the design recom- mendation. Frederking et al. (1992) presented measurements...

...V.A. Nikitin; S.A. Kolesov ABSTRACT: Calculated and measured values of stresses and ice forces under ice compacting leading to the ridging of the ice floes are presented in this paper. The calculated stresses were obtained using the knowledge of the ice strength characteristics. For the ice...

... the existing relations for the determination of the ice force acting on the isolated pile are presented also. INTRODUCTION The relations presented in Table 1 are based mostly on a few results of the laboratory experiments (Frederking and Karri, 1983; Christensen, 1988; Nevel, 1972; Vershinin, 1985), in vivo...

... structures. Zonal ice force approach is used with the normal ice force component depending on the relative movement of the zonal ice edge and contact face. The theory is applied to simulated medium-scale interaction tests with columnar grained fresh-water ice and interaction events in the field. INTRODUCTION...

.... The explicit finite-difference method is used in the FORTRAN program SHELF-M to investigate the ice-structure interaction. It is proved that the dimensionless ice strength parameters have great influence on the ice force value and on the interaction process. INTRODUCTION The ice loads are known to be the most...