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底部剪力法里,我们说近似可以用第一周期来代表房子的自振特性。换言 之,我们认为整个房子的有效质量都分配到第一振型,忽略第二振型和第三振型的存在。我 们今天的振型分解结果表明,第一振型占到了 91.4%,作为近似计算,可以近似认为约等于 100%。这也就是底部剪力法的合理性所在。尽管不够精确,但是底部剪力法可以快速的近 似估算地震反应的大小,为设计和分析提供了一种合理的近似方法
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owner: bian222 - (no access) - 地震力是怎么算出来的111.pdf, p67


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