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• ANNUAL REPORT 2013
state-of-the-art knowledge and shows great potential
for the prediction of the interaction with fixed offshore
structures. Key aspects of the model are the simulta-
neous and non-simultaneous failure of the ice and the
development of local damage in the ice. The resulting ice
force and structural response signals obtained with the
model show that the model contains the correct physical
aspects of the interaction process (Figure 15). Hence the
modelling work in SAMCoT is expected to contribute to
both improved understanding of the interaction process
as well as the development of mitigation measures in
the future. The work on modelling and prediction will be
finalized in 2014.
Heterogeneity of level ice and ice ridge
properties
PhD candidate Taya Sinitsyna from St.Petersburg State
Polytechnical University is working on the influence of
heterogeneity of level ice and ice ridge properties in
relation to ice load on offshore structures. In 2013 she
analysed field data on local ice strength (published one
POAC’13 paper) and determined theoretical distribu-
tion laws (Sinitsyna et al., 2013. She used a discretized
numerical model to describe the ice and calculate the
ice actions.
Ice action on sloping structures
Janne Rante from Aalto University is doing research on
ice action on sloping structures. The calculation of ice
loads is a difficult but at the same time a very interesting
topic for an engineer. A typical ice structure interaction
event is highly non-linear. Different ice failure modes
such as bending, shearing, crushing and buckling can
take place. In accurate ice load predictions the accumu-
lation of ice rubble in front of the structure needs to be
taken into account. Ice properties have an important role
in ice rubble formation and ice accumulation. In nature,
ice properties vary with respect to space and time creat-
ing more challenges to ice load calculations.
Figure 15. Left: experimental results from Kärnä et al. (1999), from top to bottom: displacement of structure, velocity of
structure and ice force. Right: Results from SAMCoT IIV prediction model for the same scenario.