Mechanical Properties and Seismic Loss Assessment of Improved Isolation Bearing with Variable Stiffness

For improving the seismic isolation effect, traditional rubber bearing provides a smaller horizontal stiffness. However, it is unfavorable for displacement control of layer under rare earthquakes. In this paper, an improved lead-core proposed. The can provide small stiffness to enhance effect Under large earthquakes, prevent over-limit failure due excessive displacement. mechanical properties were investigated using finite element method (FEM), and restoring force model was established. Based on FEMA P-58 theory, earthquake loss assessment in terms repair cost casualty indexes carried out normal frame structures, structures. results show that maintains before limited, giving full play performance. After that, enhanced, which effectively layer. give energy dissipation characteristics. four performance levels, structure has highest safety reserve best collapse resistance. use bearings reduce casualties.