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本文用拉普拉斯变换法计算了考虑齐地表刚性结构底部地基效应及侧壁剪切力的二维动力响应,分析了反映二维效应的两个无量纲参数:质量比ξ和尺寸比η对结构——介质相互作用的影响,给出了在地表突加线性衰减荷载作用下齐地表刚性结构底板的最大动反力及顶底板上最大设计动荷载及其随ξ、η和侧壁摩擦系数β的变化曲线。所得结果表明,在受冲击荷载的地基基础、导弹发射井、桩基等的结构计算中,考虑结构——介质的相互作用的二维效应是十分必要的。
In this paper, the two-dimensional dynamic responses of the foundation effect and the lateral shear force of the rigid structure considering the rigid structure of the earth are calculated by using the Laplace transform method. Two dimensionless parameters reflecting the two-dimensional effect are analyzed: mass ratio ξ and size ratio η. With regard to the influence of the structure-medium interaction, the maximum dynamic reaction force of the floor rigid structural floor and the maximum design dynamic load on the roof and the floor with the ξ, η and side wall friction are given under the surface sudden increasing linear attenuation load. Coefficient β curve. The obtained results show that it is necessary to consider the two-dimensional effect of the structure-medium interaction in the structural calculation of the foundation of the impact load, missile silos, and pile foundations.