柔性海洋结构冰激振动问题的对策

冰荷载对海洋结构的威胁除了它们的高荷载外,更多的在于显著的动力效应。由于冰对结构物的剧烈振动,导致了多起海洋结构被破坏的事例,因此,必须采取措施减小海洋结构的振动。本文通过分析冰荷载及其引起结构振动的特点,提出和归纳了改变振源特性、隔振、动力消振以及优化结构振型等一系列用于减小结构冰激振动的措施,并结合一些工程实例说明这些减小冰振的措施是切实可行的。

Countermeasures to Ice-Induced Vibrations of Offshore Flexible Structures

The ice loads threaten offshore structures by their evident dynamic effects in addition to high load. There are a few accidental events causing damage of offshore structures due to severe ice-induced vibra-tions, so it is necessary to reduce vibrations of offshore structures with some measures. On the basis of analysing the features of ice loads and ice-induced structural vibration . a series of measures to reduce ice-induced structural vibration such as alternation of vibration source feature , isolated vibration ,dynamically e-limanating vibration , and optional structure vibration types are presented and summarized. Some engineering examples illustrate the measures being feasible.