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基于辐射波浪理论的圆形桥墩动水压力表达式的简化研究

Keywords: 桥梁工程,圆形桥墩,曲线拟合,动水压力,流固耦合,辐射波浪理论

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Abstract:

为了解决基于辐射波浪理论的圆形桥墩外域水动水压力表达式极其繁冗、难以计算的问题,对动水压力的影响要素如自由表面波、附加阻尼、附加质量进行了研究,通过数学分析、曲线拟合的方法提出了圆形桥墩外域水动水压力的简化表达式。研究结果表明自由表面波对附加质量、附加阻尼的影响很小,附加阻尼本身也很小,可不考虑自由表面波以及附加阻尼的影响;刚体运动附加质量近似等于弹性振动附加质量,可用易于计算的刚体运动附加质量替代难以计算的弹性振动附加质量。实际深水桥梁在不同地震波作用下的地震响应计算结果表明,简化表达式具有很高的精度和计算效率。

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