3D seismic response characteristics of a pile-mat-founded AP1000 nuclear-island building considering nonlinear hysteretic behavior of soil

Given the increase of nuclear power plants, it has become unavoidable for pile-supported nuclear-island buildings to be constructed on coastal deposits potentially influenced by strong earthquakes. The coupling influences hysteresis nonlinearity soil and soil-pile-structure interaction (SPSI) have not yet been considered comprehensively in seismic response analysis building, although is a vital issue. On basis newly-developed generalized non-Masing hysteretic constitutive model, 3D integrated simulation method proposed evaluate responses pile-mat-founded building system subjected multidirectional earthquake motions. This involves an explicit parallel algorithm framework, comprising modeling, pile-mat foundation inhomogeneous domain artificial boundary condition. bedrock records near-field, moderate-far field far-field scenarios are assumed determining motions ultimate operational safety For actual AP1000 results show complexity significance effect site, tridirectional shaking, secondary soil. Such complex significantly increases building. A notable finding that scenario earthquakes with abundant long period components may more destructive potential than characteristics short shorter durations. provide insights into design buildings, which could guide construction such similar facilities high intensity regions.