Nagazumi TAKEZAWA, Taro UCHIDA and Keiji TAMURA
Abstract
Many structures, such as housing, building, bridges etc., were damaged by the
Hyogo earthquake in 1995. At that time, it was tried to evaluate seismic resistance
of Sabo dam. However, at that time, earthquake observation records for Sabo
dam was not exist, so the adequate analysis of seismic resistance could not
be carried out. While, recently, many seismic responses of Sabo dams were observed.
Thus, we evaluated seismic resistance using two observation records (small and
medium earthquakes). At first, we examined the applicability of seismic response
analysis to evaluate seismic resistance of Sabo dam. Results showed that the
seismic response analysis can explain seismic response characteristics of Sabo
dam, although elastic coefficient of ground and damping factor of ground have
to be fitted to observation record. Then, we examined effects of size of earthquake
on values of these fitted parameters and showed that seismic response characteristics
of the Sabo dam on the medium earthquake can be reenacted using parameters which
were fitted from observation record of small earthquake. Based on these analyses,
it can be thought that at least, the concrete gravity Sabo dam has enough seismic
resistance with the earthquake that corresponds to 6 upper of JMA Seismic Intensity.
Key wordsFSabo dam, seismic resistance evaluation, observation records, elastic
coefficient, damping factor.