抄録
This report presents the dynamic characteristics of two buildings of which structural systems consist of pre-cast concrete walls, connecting to reinforced concrete beams with bolts. One of the buildings was constructed 13 years ago and the other was newly constructed at the same site. Two buildings have approximately same dimensions. Array observations are done with seismometers in the buildings and the ground. Stiffness degradations by moderate earthquake were investigated in comparisons with dynamic properties of two buildings.
