演示系统如何识别基本周期。
由于吉林兰旗松花江大桥为半飘浮体系斜拉桥，基本周期较长。
Because of the half floating structural system, the basal period of Lanqi Songhua River Bridge is comparative long.
本文给出了周期函数的几个性质，并证明了连续的周期函数基本周期的存在性。
The article expounds the nature of periodic function and proves the existence of the base period of the continuous periodic function.
同时，通过统计分析给出第二振型、第三振型周期与基本周期比值的经验公式。
In addition, the empirical formulas for estimating the ratios of 2nd and 3th mode periods to the fundamental period are put forward through statistical analysis.
首先，当下部结构为整体支承结构时，提出将下部结构按基本周期等效简化为简单框架结构。
Firstly, for holistic substructure, the substructure was simplified as simple frame structure based on principle of equivalent fundamental periods.
当全部采样点都处理过后，可在基本周期的最后一个时间间隔中得到和离散傅立叶变换一样的结果。
When all the sample points are handled after the basic cycle of a time interval finally received and discrete Fourier transform as a result of the introduction of DFT algorithm and the Z-transform.
结果表明，筒桩基础桩基相对桩基于桩基有较好的抗震性能，筒桩基础的柔性改善了结构的基本周期。
The result is that cylindrical foundation is more earthquake-resistively than pile foundation, that cylindrical foundation flexibility improves the structural basic cycle.
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；
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；
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.
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