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首页> 外文期刊>Archives of Hydro-engineering and Environmental Mechanics >Loads Exerted on a Cylindrical Structure by Floating Ice Modelled as a Viscous-Plastic Material
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Loads Exerted on a Cylindrical Structure by Floating Ice Modelled as a Viscous-Plastic Material

机译：通过建模为粘塑性材料的浮冰施加在圆柱结构上的载荷

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In this paper the problem of interaction between a coherent floating ice field and a fixed, rigid, vertically-walled circular cylinder is investigated. The ice cover, of horizontal dimensions significantly larger than the characteristic size of the structure, is assumed to be driven against the cylinder by wind drag forces. The ice is treated as a viscous-plastic material, in which the permissible stress states in the horizontal plane are bound by an elliptic yield curve. By using an associated flow rule, a constitutive law, involving two parameters defining the ice strength in compression and much smaller strength in extension, is derived in order to describe the behaviour of the material. The law predicts distinct responses during yield (occurring at high strain-rates) and during the flow when the yield condition does not apply (at lower strain-rates). The results of numerical calculations performed by a finite difference method illustrate, for chosen ice rheological parameters, the distribution of contact stresses at the ice -structure interface. Two forms of boundary conditions at the cylinder wall, free-slip and no-slip, are considered, and their effects on the horizontal loads sustained by the structure are examined. In addition, the results for the viscous-plastic rheology of ice are compared with those obtained on the assumption of a purely viscous behaviour of ice.
机译：本文研究了一个连贯的浮冰场与一个固定的，刚性的，垂直壁的圆柱体之间的相互作用问题。假设冰盖的水平尺寸明显大于该结构的特征尺寸，它是通过风阻力将其推向圆柱体的。冰被视为粘塑性材料，其中水平面中的允许应力状态由椭圆屈服曲线限制。通过使用关联的流动规则，可以得出一个本构律，其中涉及两个参数，这些参数定义了压缩的冰强度和拉伸强度小得多，以描述材料的行为。该法则预测在屈服条件下（高应变率下）和不适用屈服条件的流动过程（低应变率下）会有不同的响应。通过有限差分法进行的数值计算结果表明，对于选定的冰流变参数，在冰-结构界面处的接触应力分布。考虑了两种形式的缸壁边界条件：自由滑动和不滑动，并研究了它们对结构承受的水平载荷的影响。另外，将冰的粘塑性流变学的结果与假设冰纯粘性行为获得的结果进行了比较。

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