Journal of Materials and Engineering Structures
Volume 10, Numéro 2, Pages 185-193
2023-06-30
Influence Of Ground Motion Duration On Seismic Fragility Of Base Isolated Npp Structures
Authors : Phan Van-tien . Vu Xuan-hung . Nguyen Duc-xuan .
Abstract
This study investigates the influence of earthquake duration on seismic fragility of base isolated nuclear power plant (NPP) structures. Two groups of ground motions are employed in performing time history analyses, in which short duration (SD) and long duration (LD) characteristics are considered. The advanced power reactor 1400 (APR1400) NPP structures are used for developing finite element model, which is constructed using lumped-mass stick elements. A series of 486 lead rubber bearings (LRBs) are installed under the base mat of the NPP structures to reduce the seismic damage. Seismic responses of the base isolated NPP are quantified in terms of lateral displacements and hysteretic energy distributions of LRBs. Seismic fragility curves for damage states, which are defined based on the deformation of LRB, are developed. The result shows that the lateral displacements of LRBs under SD and LD motions are very similar. The average deformation of LRB for LD motions is higher than that for SD motions if PGA is larger than 0.4g. The probability of damage of base isolated NPP structures under LD motions is approximately 14% smaller than that subjected to SD earthquakes. This finding emphasizes that it is crucial to use both SD and LD ground motions in seismic analysis of base isolated NPP structures.
Keywords
Nuclear power plant structure ; Lumped mass stick model ; Earthquake duration ; Lead rubber bearing ; Fragility analysis
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