Abstract
The objective of this study is to evaluate effect of vertical ground motion on dynamic response of underground RC structures embedded in horizontally layered ground with inclined bedrock at the right side. Because of irregular topology of ground some extent of vertical response is occurred by only horizontal ground shaking, and frequency characteristics of acceleration response near the structure scarcely fluctuated. Then horizontal and vertical components of seismic load is roughly caused by respective component of ground motion. As far as the effect of ground motion, is concerned, horizontal component plays a rules on global shear deformation and vertical one brings a slight fluctuation of axial force on upward columns.
