考虑SSI效应的吹填岛礁场地风机地震响应研究OA北大核心

Hydraulically reclaimed coral islands are important land barriers in China's South China Sea territory.As wind turbines are essential power supply infrastructure on these islands,ensuring their seismic safety is of great significance.The mechanical properties of coral sand are significantly differ-ent from those of common terrestrial sediments.The interaction between coral sand and wind turbine structures is a potential factor influencing their seismic response,yet it remains insufficiently studied.This study used the Matasovic constitutive model to develop the dynamic nonlinear constitutive rela-tionship of coral sand.A locally layered three-dimensional hydraulically reclaimed island site and an NREL 5MW wind turbine were established,and a rigid foundation wind turbine model and an integrat-ed wind turbine-foundation-subsoil model considering soil-structure interaction were designed.Four representative ground motions were selected based on duration and dominant frequency,and the dy-namic responses of the wind turbine were comparatively analyzed under different ground motions using the finite element model.The calculation analysis showed that seismic motions with significant high-frequency components induced more pronounced acceleration responses in the free field of the hydrauli-cally reclaimed islands.The average horizontal acceleration amplification factor was 3.8 for short-dura-tion near-fault ground motions and 1.7 for long-duration far-fault ground motions.The SSI effect be-tween the coral islands and the wind turbine foundation increased the dynamic response of the wind tur-bine.Under design-level earthquakes,considering the SSI effect,the maximum increases in tower dis-placement,stress,shear force,bending moment,and axial force were 0.24,0.87,1.54,0.45,and 0.23 times,respectively.The seismic response analysis of wind turbines on hydraulically reclaimed is-land sites should consider the SSI effect to achieve more reliable evaluation of seismic performance.