On March 2005, the River Bureau of the Ministry of Land, Infrastructure and Transport issued “Guidelines for Seismic Performance Evaluation of Dams during Large Earthquakes (Draft).” The Draft Guidelines describe the methods for systematically evaluating the seismic safety of dams subjected to large earthquake motions, including establishment of scenario earthquakes and required seismic performance of dam bodies and appurtenant structures. Before practical application of the Guidelines, we require further study for verification with existing dams. Therefore, the Guidelines are used as “Draft” during trial
implementation for verification. The Draft Guidelines are composed of four chapters,” Basic matters”,” Required seismic performance”,” Methods for evaluating dam bodies” and ” Methods for evaluating appurtenant structures.” The chapter of “Basic matters” describes the definitions of technical terms, the seismic safety to be evaluated, etc. The chapter of “Required seismic performance” describes the procedure for setting scenario earthquake for seismic performance evaluation. Especially, it also shows “Earthquake motions
with lower-limit acceleration response spectrum for evaluation.” The chapter of ” Methods for evaluating dam bodies” describes that the seismic performance of the dam body is evaluated basically by dynamic analysis and additionally by cumulative pertinent damage processes analysis . The chapter of ” Methods
for evaluating appurtenant structures” shows the basic concept for evaluating gates, pier, intake facility, control devices and so on.