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基本振型的自振周期是经常用来说明框架的动力特性的。框架的基本自振周期值可以从有关资料的振动方程式直接计算出来。然而在实际的设计工作中,精确的分析须耗费很多的时间,最好是选用经验的公式。有很多这种经验的公式已经提出来了,其中的一些已在建筑规范中或其它的机构采纳了,但是用这些公式估计出来的数值比较粗糙,有些例子的误差超过100%。本文提出一个改进了的估算多层多跨框
The fundamental vibration mode is often used to illustrate the dynamic characteristics of the frame. The basic natural period value of the frame can be calculated directly from the vibration equation of the relevant data. However, in the actual design work, accurate analysis takes a lot of time, it is best to use empirical formulas. There are many formulas for this experience that have been proposed, some of which have been adopted in building codes or other institutions, but the values estimated using these formulae are rough, and the errors in some cases exceed 100%. This paper proposes an improved estimation multi-layer multi-span box