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码头前停靠的船舶在规则波掀动下,将周期性地撞击码头,迫使结构产生受迫振动.该问题是沿海开敞水域中高桩码头结构的重要动力问题,而至今尚无较全面的直接研究.因此,本文在分析主要参数对动力影响的基础上,特建议一种近似的实用解法.假定高桩码头结构的计算模式为弹性桩基上的水平质量块.在船舶周期性的斜向、偏心撞击力作用下,质量块一般主要在水平面形成x_0、y_0、φ_0三个自由度的联合迫振.文中对各种有、无阻尼的迫振情况,导出了质量块动位移和桩顶动反力的计算公式,并通过算例的电算结果,对自由度的数目、单桩刚度的退化、附加水体质量和结构阻尼的大小等参数对动力的影响,进行了初步分析.文末得到了一些定性的结论.
Ships docked in front of the pier will periodically impact the pier under regular wave tilt, forcing the structure to produce forced vibration. This problem is an important impetus for high-piled quay structures in open coastal waters, and there has been no comprehensive direct Research. Therefore, based on the analysis of the influence of the main parameters on the dynamics, an approximate practical solution is proposed. Assume that the calculation mode of the high-piled wharf structure is the horizontal mass on the elastic pile foundation. Under the action of eccentric impact force, the mass generally forms a combined impulse of three degrees of freedom, x_0, y_0, and φ_0, in the horizontal plane. In this paper, the mass displacement and the top of the pile are derived for various impervious and undamped vibration conditions. The calculation formula of dynamic reaction force, and through the calculation results of the example, the preliminary analysis of the influence of parameters such as the number of degrees of freedom, the degradation of the stiffness of the single pile, the additional water mass and the size of the structural damping, etc., was performed. Some qualitative conclusions.