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船舶与桥墩撞击力-撞深关系概率模型

, PP. 59-67

Keywords: 桥梁工程,概率模型,数值模拟,撞击力-撞深,船-桥碰撞

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Abstract:

?为考虑船桥碰撞过程中荷载的随机性,进行了轮船撞击刚性墙的模拟计算。考虑到船舶结构的多样性,建立了9艘不同吨位和尺寸轮船的有限元模型,并以9种不同的速度撞击刚性墙,得到了81条船撞击力-撞深过程样本曲线。将样本曲线量纲一化,并采用21个离散点近似表示每条量纲一化曲线,在各离散点处对量纲一化撞击力进行了统计分析。通过对概率密度函数进行限界修正,建立了撞击力-撞深过程的概率统计模型,最后在统计意义上对概率模型的参数取值进行了讨论。研究结果表明:在各撞深处的量纲一化撞击力近似服从正态分布;限界修正方法消除了随机变量在数学意义与物理意义上的矛盾,提高了模型的适用性;所建立的概率模型在统计意义上与数值模拟获得的样本吻合良好。

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