DYNAMIC MODEL AND SEISMIC RESPONSE ANALYSIS OF FRICTION SURFACE ISOLATION STRUCTURES

In view of the large displacement and residual deformation of friction-slip isolation systems under strong earthquakes, we propose a friction surface isolation structural system, in which the superstructure moves reciprocally around the curvature center of the isolation layer under earthquakes and gravity. A simplified single-point double-mount editing mechanical model of the friction surface structure is established. The expression of the bearing axial force and its parameter correlation are obtained based on the equation of motion. The shake table test of a reinforced concrete frame shear wall structure model was completed. The experimental results show that the acceleration response of the friction surface isolation structure is slightly increased compared with that of plane friction slip structures, but it has better effect in controlling the displacement of the barrier layer and bearing stress of the isolation layer. The numerical simulation of the shake table test was carried out. The correctness was verified by comparison of the test results. The effect of the curvature radius and the coefficient of friction of the isolation layer on the structural response was analyzed by numerical simulation.