Analisis Kerentanan Shelter Tsunami terhadap Beban Gempa dan Tsunami Menggunakan Metode Time History dan Incremental Dynamic Analysis
DOI:
https://doi.org/10.55893/jt.vol24no2.733Keywords:
earthquake, structure fragility, shelter, Time History, tsunamiAbstract
Palabuhanratu is a location with an elevated risk of an 8.9 Mw earthquake and a 20-meter tsunami, with a population of approximately 119,347 and up to 1.7 million annual visitors. This research analyzes the shelter's fragility using non-linear time history and Incremental Dynamic Analysis methods under three recorded earthquakes; Chi-Chi, Iwate, and Tohoku and tsunami loads with variations of 2.5–20 m inundation. The analysis results show that the structure satisfies IO performance against earthquakes at scale 1.0 but experiences a significant increase in roof drift due to tsunami loads and exceeds LS limit, especially at 15 m inundation height. The fragility curves show that the probability of extensive damage reaches 95.6% and the collapse probability 10.93% in the tsunami with debris, whereas in the scenario without debris the probability of extensive damage is almost zero. The findings confirm the importance of considering debris loads in tsunami shelter design and provide an empirical basis for the development of fragility curves for tsunami shelter structures.
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