Author(s): Oddgeir Dalane; Xu Ning; Yue Qianjin; Tuomo Karna; Sveinung Loset
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Abstract: This paper addresses a condition where a conical structure is exposed to the action of sheet ice. The focus is on narrow cones, for which the rubble build-up does not influence the ice actions. Both field data and recent theoretical studies show that the time-varying ice action and the structural response constitute a narrow-band random process under these conditions. Experiences from structural dynamics indicate that the time of exposure can be a significant parameter if the response has a narrow-band character. This feature has consequences on the numerical simulation of this kind of ice action. There is a chance that the real response will be underestimated if the time of a numerical simulation is not sufficiently long. This problem is studied by using a numerical method based on data obtained from full-scale structures deployed in the Bohai Bay. The main idea is to find out how long it can take before the maximum response is obtained while main parameters of the load model vary randomly. The results of this simulation are compared with a similar analysis performed on full-scale data.
Year: 2008