Calculation of structural natural-frequency is the important content of elastic analysis, and its value directly influences the seismic action in seismic design.
结构的自振频率计算是弹性分析的重要内容，自振频率的大小直接影响到结构在抗震设计中的地震作用。
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Taking action to learn more to fill the desire not only get enrichment and honor, but also getting back the self-affirmation, building up the confidence. That is the deeper valueof learning design.