Abstract: In the coastal regions of Fujian,there are a large number of residential buildings constructed from stone,and they exhibits poor seismic resilience.Stone walls are the main load-bearing and lateral force resistant components of stone structures.Strengthening stone walls with UHPC infilled joints can improve the seismic performance of stone structures.To explore the overall seismic performance of stone structures after UHPC infilled joints,this study utilized the LS-DYNA finite element software to establish two distinct models of stone structures:one without reinforcement and another reinforced with UHPC infilled joints.The research aimed to investigate the complete seismic failure process,analyzed the seismic response,failure mechanisms,and performance of the structures.Findings reveal that the stone structure exhibits a “vertical collapse” failure mode under seismic action.For PGA of 55 gal and 110 gal,the unreinforced structures exhibited minor to complete collapse,whereas the reinforced structures showed conditions ranging from minor damage to moderate destruction.Compared with the unreinforced structure,the fundamental period of the reinforced stone structure is slightly reduced,the peak acceleration of floor has decreased by 21.05% to 25.26%,and the displacement angle was reduced by 74.90% to 94.50%.The infilled joints reinforcement effectively curtailed stone wall cracking,mitigated structural damage,and significantly enhanced reinforcement effectiveness.