Ảnh hưởng của đường quan hệ lực cắt - chuyển vị ngang của gối cách chấn đa lớp đến hiệu quả giảm chấn của nhà cách chấn đáy có kết cấu tường gạch

Multilayer elastomeric isolator is a device of passive control system that is commonly used for earthquake-resistant structures. Effective horizontal stiffness and equivalent viscous damping are two important parameters of characteristic properties of the isolator, while the effective horizontal stiffness is directly determined from shear force – horizontal displacement curve of the isolator. Seismic performance of a base-isolated building under earthquake is affect by the effective horizontal stiffness parameter of the isolator. However, there are very few studies examining this influence. This study present the investigation of the seismic performance of a base-isolated masonry building supported on different isolators with different shear force – horizontal displacement curves under same ground motion of a real earthquake in past by time-history analysis method. Comparison of the iner-story drift, base shear force and stress in the walls of the building in the cases above is performed. Results show that the base-isolated building using the isolators with smaller horizontal shear force values as compared at the same magnitude of horizontal displacement will have better seismic performance under earthquakes.