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首页> 外文期刊>Journal of offshore mechanics and arctic engineering >A Three-Dimensional Model for Ice Rubble Pile-Ice Sheet- Conical Structure Interaction at the Piers of Confederation Bridge, Canada
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A Three-Dimensional Model for Ice Rubble Pile-Ice Sheet- Conical Structure Interaction at the Piers of Confederation Bridge, Canada

机译：加拿大联邦大桥墩处冰瓦桩-冰片-圆锥结构相互作用的三维模型

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摘要

Offshore structures constructed in waters where ice cover is prevalent for several months a year are subjected to ice loading. Some of these structures are conical or sloped-faced in shape, where flexural failure becomes the dominant mode of failure for the ice sheet. The flexural failure mode reduces the magnitude of ice-structure interaction loads in comparison to other modes of failure. Various researchers have devised flexural failure models for ice-conical structure interactions. Each model shares the same principle of the ice sheet being modeled as a beam on an elastic foundation, but each model has different limitations in precisely simulating the interaction. Some models do not incorporate the ice rubble pile, while other models make oversimplified assumptions for three-dimensional behavior. The proposed three-dimensional (3D) model aims to reduce some of these limitations with the following features: (1) modeling the geometry of the ice rubble pile around the conical pier using the results of small-scale tests, (2) modeling the loads exerted by the ice rubble pile on the conical structure and ice sheet with a rigorous method of slices, (3) adding driving forces in keeping the rubble pile intact and in upward motion during the interaction, (4) accounting for eccentric offsetting moments at the ice-structure contacts, and (5) modeling the flexural behavior of the ice sheet subject to ice rubble loads using finite element method. The proposed model is used to analyze the interaction events recorded at the conical piers of the Confederation Bridge over a period of 11 years.
机译：在每年数月覆冰的水域中建造的近海建筑要承受冰荷载。这些结构中的一些呈圆锥形或斜面形状，其中弯曲破坏成为冰盖破坏的主要方式。与其他破坏模式相比，弯曲破坏模式降低了冰结构相互作用载荷的大小。许多研究人员已经设计出了冰锥结构相互作用的弯曲破坏模型。每个模型都具有相同的原理，即将冰盖建模为弹性基础上的梁，但是每个模型在精确地模拟相互作用方面都有不同的限制。一些模型没有包含碎冰堆，而其他模型则对三维行为进行了过于简化的假设。拟议的三维（3D）模型旨在通过以下特征减少某些局限性：（1）使用小规模试验的结果对圆锥形码头周围的碎冰堆的几何形状进行建模，（2）对模型进行建模用严密的切片方法将碎冰桩施加在圆锥形结构和冰盖上的载荷；（3）增加驱动力，以使碎石桩保持完整并在相互作用期间向上运动；（4）考虑到在离心作用下的偏心力矩（5）使用有限元方法对承受冰瓦砾载荷的冰盖的弯曲行为进行建模。所提出的模型用于分析在11年期间在联邦大桥的圆锥形墩处记录的相互作用事件。

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