Analysis and classification of stepwise failure of monolithic breakwaters
Analysis and classification of stepwise failure of monolithic breakwaters
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DOI：
10.1016/j.coastaleng.2017.01.001
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发表时间：
2017-03
影响因子：
4.4
通讯作者：
H. Elsafti;H. Oumeraci
中科院分区：
文献类型：
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作者：
H. Elsafti;H. Oumeraci
摘要介绍了整体式防波堤逐步破坏的分析、解释和分类。整体防波堤通过逐级破坏机制，随着波浪荷载事件的发生，其残余位移呈递增趋势。这种破坏模式与波浪-结构-基础相互作用中涉及的高度复杂的过程有关，甚至在相对温和的波浪条件下也可能发生。基于验证的CFD-CSD模型系统的分析结果和大型物理模型试验数据，提出了一种新的概念——荷载偏心概念，用于对地基在4种荷载偏心状态下的响应进行分类。该概念基于相对偏心率e/B，即基础-结构界面中点产生的竖向力的偏心率e与该界面宽度B的比值。事实上，相对偏心率携带了与波浪荷载（水平力和隆起力）和结构特性（质量和几何形状）有关的所有重要信息。在此基础上，建立了能够处理系统非线性（如土壤塑性）的三自由度模型，并进行了初步分析。对于模型的应用，只需要两个参数：相对荷载偏心和相对土密度。
Abstract Analysis, interpretation and classification of stepwise failure of monolithic breakwaters are presented. Through the stepwise failure mechanism, monolithic breakwaters develop incremental residual displacements with each wave load event. This mode of failure is associated with the highly complex processes involved in wave–structure–foundation interaction and may occur even under relatively moderate wave conditions. Based on the results of the analysis of a well validated CFD–CSD model system and large-scale physical model test data, a new concept, named load eccentricity concept, is proposed to classify the response of the foundation in four load eccentricity regimes. This concept is based on the relative eccentricity e/B, ie the ratio of eccentricity e of the vertical force resultant from the mid-point of the foundation–structure interface related to width B of this interface. In fact, the relative eccentricity carries all significant information related to the wave loads (horizontal and uplift forces) and to the properties of the structure (mass and geometry). Further, a new 3-DOF model, which can handle the system nonlinearity (eg soil plasticity), is developed for preliminary analysis. For the application of the model, only two parameters are needed: the relative load eccentricity and the relative soil density.