地震観測記録を用いた砂防えん堤の耐震性に関する研究

抄録

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.