Structural safety

Conclusions from previous work have been reviewed, compared and summarised.

A method for estimating the probability of icebergs is presented, and available data sources are evaluated. Calving rates for the primary sources of icebergs in the Barents Sea, including the statistical distribution of shape and size, form premises for calculating the annual probability of collision with floating glacier ice. Calculations for the selected area show that the annual probability of being hit by icebergs is greater than 10-4 and must be designed for. 

Three different analytical methods were assessed for the calculation of energy absorption and documentation of structural integrity. Recommended approaches for modelling are proposed, based on the geometry of the iceberg.

Previous collision analyses have been based on icebergs of size 15m, since larger icebergs can be detected on radar and handled. In this study, it is shown that the probability of detecting icebergs reduces as wave height increases.

The work is summarised in two documents, a main report that summarises the work in its entirety, and a shorter one that summarises what has been learnt in respect of the design and reanalysis of facilities.