The results shows that the fundamental frequency of the model which takes the combined activate into consideration reduced evidently, and the fundamental period prolonged evidently.

研究结果表明，考虑地基土、砂砾石垫层、上部结构共同作用时，结构的基本频率明显减小，相应的基本周期明显延长；

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The results show that the system will lose stability when the rotating angular velocity is greater than its fundamental frequency in classical dynamical model.

分析结果表明，在传统力学模型中，当转动角速度小于弹性梁的基频时，系统稳定；反之，系统将失稳。

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The results show that the system will lose stability when the rotating angular velocity is greater than its fundamental frequency in classical dynamical model.

分析结果表明，在传统力学模型中，当转动角速度小于弹性梁的基频时，系统稳定；反之，系统将失稳。

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