地震参与系数有什么用呢？根据这个参与系数，我们可以进一步得到各个振型对位移、地震 力的贡献。换言之，也就是把每一层的有效质量 0.3 分配到每个振型。
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bian222 - (no access) - 地震力是怎么算出来的111.pdf, p65
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