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5.21 对于按一维(悬臂)简图进行计算的构筑物,应考虑不少于3个振型;而对于按二维简图进行计算的构筑物,对混凝土坝应考虑不少于10个振型,对土筑坝则应考虑不少于15个振型。
5.21 No less than 3 modes should be considered for structures that are calculated by one-dimensional (cantilever) diagrams, and no less than 10 modes should be considered for concrete dams that are calculated from 2D sketches. For earth dams, no less than 15 modes should be considered.