Evaluation of seismic performance of gravity dam based on incremental dynamic analysis

The ratio of plastic energ y consumptio n to t otal deformat ion ener gy based on the incremental dynamic analysis method ( IDA) w as used as t he str uctural performance index . T he three2lev el seismic damage classificatio n of gr avit y dam seismic per2 fo rmance ev aluatio n and t he failure deg ree div ision under tw o limit states wer e pro posed. The IDA cur ve w as made and com2 bined w ith the quantile analysis and fr agilit y analy sis t o evaluate the seismic performance of the gr avity dam. Taking the Jing2 niang Lake g ravity dam as an ex ample, a series o f nonlinea r analyses wer e carried out. The results showed that the peak g ro und acceler atio n ( PGA) of each limit state in the IDA curve o f the quantile analy sis was lar ger t han the peak g ro und acceler atio n of the designed earthquake, which satisfied the gr avit y and the lev el of functional suppo rt and safety assur ance of the dam. Under the fr agility analy sis, 651 92% probability of the 11 5 times desig n earthquake was in the no rmal use stag e and could a 100% safety guar antee. The results show ed that the g ravity dam had a g oo d seismic perfo rmance. The r esults of this study may pro2 v ide a new idea fo r the seismic performance design and safety risk assessment o f gr avit y dams.

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