海洋平台结构的冰力作用模型

首先分析了工程中静冰力计算中普遍应用的Korzhavin -Afanasev公式和Schawz公式 ,提出了统一的静冰力模型 ,给出了挤压破坏、屈曲破坏和弯曲破坏冰力系数函数CI(t)。应用该冰力模型分析了自激振动产生的条件 ,指出冰屈曲破坏和弯曲破坏动冰力可以作为强迫振动模型 ,冰挤压破坏动冰力则需要考虑CI(t)与冰阻尼的耦合效应。最后应用冰力一般模型计算单自由度结构的响应

Ice force models for offshore platform structures

In this paper, a uniform static ice force formula is presented based on the analysis of the generally used Korzhavin-Afanasev formula and Schawz formula. A uniform formula of the ice force model is presented, in which an ice force coefficient function C I(t) is given covering crushing, buckling and bending failure of ice. By using this ice force model, the self-excited vibration occurring condition is analyzed, with the result that when ice is broken in buckling or bending form, ice force can be considered as a forced vibration model; when ice is broken in crushing form, coupled effects of C I(t) and ice damping should be considered. In the end, a SDOF structure is analyzed applying this uniform ice-force model.