Seite - 1228 - in Book of Full Papers - Symposium Hydro Engineering

(a) (b) (c) (d) Fig. 5. Response results under the pulse-like records in terms of Tp/T1: (a) maximum crest relative displacement, (b) damage dissipated energy, (c) base local damage index, (d) neck local damage index. Because Sv(T1,5%) and Sd(T1,5%) was shown as good predictors of dam’s structural response under both pulse-like and non-pulse-like records, the conditional probability of failure is computed using these two parameter as IM. Considering Dc, Λb and Λn as EDP, the obtained fragility curves are depicted in Fig. 6. The failure threshold of Dc, Λb and Λn are assumed as 2cm, 30% and 5%, respectively. Although these thresholds are subjective, but they have illustratively used to compare the fragility curves. The probability of failure is higher for the pulse-like records than the non-pulse-like records; however, the fragility curves are very close for Dc and Λn. But, the probability of base cracking is much higher under the pulse-like records with respect to non-pulse-like records. The probability of cracking of 30% of the dam’s base length under the near-field records with Sv(T1,5%) = 20cm/sec is 45% and 85% for the non-pulse-like and the pulse-like records, respectively. 0 5 10 15 20 25 30 35 40 0 10 20 30 TP/T1 Response points Kernel-weighted average of response Mean of non-pulse-like records Median of non-pulse-like records 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 10 20 30 TP/T1 0 0.2 0.4 0.6 0.8 1 0 10 20 30 TP/T1 0 0.2 0.4 0.6 0.8 1 0 10 20 30 TP/T1 1228