| 抄録（英）： |
Anear-source earthquake differs from a far-source earthquake in the characteristic. It is not uncommon that the vertical ground accelerations are much higher than the horizontal ones. The ground motions are also characterized by high frequency contents. Since structural responses are determined by the relation between structural frequencies and the frequencies of horizontal and vertical ground excitation a simultaneous consideration of ground motions in these both directions is therefore necessary, not only for a proper analysis of vibrations of a structure but also for a proper design of secondary structures.
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