英文摘要 |
According to the current building seismic design code, the design vertical ground motion response spectrum can be derived by multiplying the horizontal ground motion response spectrum with the design vertical-to-horizontal response spectrum ratio(V/H ratio). The design V/H ratio is a period-independent constant of 2/3 for target sites nearby the active fault and 1/2 for other target sites. However, recent studies have shown that the V/H ratio strongly depends on the earthquake magnitude, distance and site condition of the ground motion, and structural period. They also found that the V/H ratio of some periods may be larger than 1 for the near-fault soil site struck by an earthquake of large magnitude. In this study, the horizontal and vertical ground motion characteristics were investigated simultaneously, and a V/H ratio model applicable for Taiwan was developed. The results of this study can provide valuable information for the revision of the design V/H ratio in the current seismic design code. |