Analysis on anti-seismic safety capability of gravity dam under old and new seismic design specification

Combined with the newly revised Code for seismic design of hydraulic structures of hydropower project(NB35047-2015) and the old Specifications for seismic design of hydraulic structures(DL5073-2000), we used the model response spectrum method to analyze the distribution law of dynamic stress, dynamic displacement and dynamic acceleration of gravity dam under the new norm and old norm. The results show that compared with the calculated results by the old specifications, the response spectra amplification coefficients of various dams′ fundamental frequency under the revised specification increase and the dynamic displacement of the dam crest increases, however, the dynamic acceleration of the dam crest decreases. The seismic dynamic stress at foundation surface increases and the seismic dynamic stress at dam head decreases. The seismic dynamic stresses of upstream and downstream dam surfaces below the dam head show a rising trend. These conclusions can provide references for project planner to evaluate the gravity dam anti-seismic safety under the new seismic code.