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首页> 外文期刊>Coastal engineering >Evaluation of wave impact loads on caisson breakwaters based on joint probability of impact maxima and rise times
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Evaluation of wave impact loads on caisson breakwaters based on joint probability of impact maxima and rise times

机译：基于冲击最大值和上升时间的联合概率评估沉箱防波堤上的波浪冲击载荷

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摘要

When waves break against seawalls, vertical breakwaters, piers or jetties, they abruptly transfer their momentum into the structure. This energy transfer is always spectacular and perpetually unrepeatable but can also be very violent and affect the stability and the integrity of coastal structures. Over the last 15 years, increasing awareness of wave-impact induced structural failures of maritime structures has emphasised the need for a more complete approach to dynamic responses, including effects of impulsive loads. At the same time, movement of design standards toward probabilistic approaches requires new statistical tools able to account for uncertainties in the variability of wave loading processes. This paper presents a new approach to the definition of loads for use in performance design of vertical coastal structures subject to breaking wave impacts. Based on conservation of momentum and joint probability of non-dimensional wave impact maxima and rise times from large-scale test measurements, a new set of equations have been derived to characterise design impact loads at different non-exceedance probability levels and guidance is given for the estimation of the static-equivalent design loads to be used in early-stage feasibility studies. Predictions of static equivalent design loads and corresponding safety factor against sliding using the proposed methodology are found to be in very good agreement with both predictions by most established deterministic methods and field observations reported in literature.
机译：当海浪冲破海堤，垂直防波堤，码头或码头时，它们突然将动量传递到结构中。这种能量转移总是引人注目的，并且永远是不可重复的，但也可能非常剧烈，并影响沿海结构的稳定性和完整性。在过去的15年中，对波浪冲击引起的海事结构结构破坏的认识不断提高，强调了对动力响应（包括脉冲载荷的影响）采用更完整方法的需求。同时，设计标准向概率方法的发展需要新的统计工具，这些工具必须能够解释波浪加载过程的可变性中的不确定性。本文提出了一种定义载荷的新方法，该载荷可用于受波浪冲击的垂直沿海结构的性能设计。基于动量守恒和无量纲波浪冲击最大值的联合概率以及大规模测试测量的上升时间，推导了一组新的方程式，以表征不同非超概率水平下的设计冲击载荷，并给出了指导。在早期可行性研究中使用的静态等效设计负荷的估算。发现使用拟定方法对静态等效设计载荷的预测以及相应的抗滑移安全系数的预测与大多数公认的确定性方法的预测和文献报道的现场观察都非常吻合。

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