TO With the object of investigating the effects of vertical ground moti 。ns en column axial fi 。rce of stee1 frames , bo血 on −line爬 s 騨 e tests using one −mass models and inelasdc response analyses for m 山 i−story frame mode 艮 s were carried out . It was shown 山 at the maximum axial force is determined mainly by s廿eng 面 pmperties of frames , ver 額cal stadc loads and the maximum 日uctuadng axial for caused by ve 血 cal vibra 樋 on , A me 山 oCl for simply estimating the maximum yield axial fi 。rce

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... tio of beth inside and outside columns for frames with σolumns all of which have nearly same yield axial force ratio under vertical loads , when they are su , bject to beth horizontal and yertical ground rnetions simultaneously , w 麗 fomulated .