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  1. Albertcnzheng

    Difference between tow types of definition of rigid diaphragm

    I want to define floor in rigid diphragm. First, I define the area element as rigid diphragm.Period is 2.86s Secondly, I define the joint(point element) as rigid diphragm,period is 1.95. I don't know why? Are there some differences between these tow types of definition?

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