Author(s): Kazuyuki Kato
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Keywords: No Keywords
Abstract: A system to estimate a design ice force on a structure which interacts with a level ice sheet has been developed. The system consists of the "Data base", the "Ice-structure interaction model" and the "Design ice force estimation model". The "Data base" provides ice conditions data associated with a specific site in terms of statistical quantities. The "Ice-structure interaction model" is able to calculate the ice force deterministically when ice conditions are specified. The "Design ice force estimation model" is basically Monte Carlo simulation, combining the statistical ice conditions and the deterministic formulae formulated in the "Ice-structure interaction model". The "Design ice force estimation model" provides a certain information of the probability density function of ice force. In this paper, the system mentioned above is outlined and detailed descriptions on the "Ice-structure interaction model" are made. The interaction models were derived for four structure types, namely vertical structures, multi-legged structures, simple inclined structures and complicated inclined structures. The interaction model for the vertical structures was deduced by summarizing the experimental and theoretical works done by the author and the other investigators. The interaction model for the multi-legged structures was formulated by introducing a multiplication factor to an ice force on an independent circular pile as a function of an arrangement of legs and an intrusion direction of ice sheet. The interaction model for the simple sloping structures contained three types of simple shaped strcuture such as inclined walls, inclined circular piles and conical structures, and were formulated using the limit plastic analysis. The interaction model for the complicated sloping structures was based on the Dual Parameters Testing and Estimating Method (DuPTEM) developed by the author, which estimates an ice force on a prototype structure from a series of model experiments in an ice tank.
Year: 1988