Abstract:
To consider the mechanical vibrations induced by the vertical disturbance forces of large dynamic equipment and the horizontal seismic effects on industrial building structures, designed was a three-dimensional isolation friction pendulum bearing capable of simultaneously achieving a vertical vibration reduction and horizontal seismic isolation. The vertical and horizontal performances of the bearing can be naturally decoupled. The bearing is composed of ring springs, of disc springs and, of a double-concave friction pendulum. Based on its structural characteristics and kinematic mechanism, the corresponding mechanical model was derived. The mechanical properties of the bearing were analyzed through both vertical compression tests and horizontal shear tests. The study results showed that the vertical hysteresis curve of the developed bearing exhibited a “triangular” shape, indicating the high load-bearing capacity and an excellent energy dissipation performance. In the horizontal direction, its performance was consistent with that of conventional friction pendulum bearings, exhibiting a “parallelogram” shape hysteresis curve that demonstrated a good energy dissipation and a fatigue resistance.