Vibration Control Of Base-isolated Benchmark Structure With Variable Friction Dampers

The vibration problem caused by strong earthquake for base isolation structure is attracted much attention in recent years, however, the research of mass center and stiffness center misalignment of eccentric structure with semi-active vibration isolation is less. Therefore, establish system of isolation control model, improve the seismic resistance of structures is of great significance. This paper analyzes the following research based on the Benchmark base-isolated structure:(1) The Benchmark base isolation system including linear bearings and the nonlinear control device, with a defined parameter set and multi-dimensional design of performance indicators, in order to evaluate the effectiveness of control algorithm. The simulation model was established with Benchmark eccentric base isolation building. Using MATLAB software to numerical simulating seismic excitations.(2) The Bouc-Wen model was improved. A new semi-active control algorithm is designed based on velocity feedback, and applied to the variable friction damper control. Established the Benchmark analysis model with combined laminated rubber bearings and variable friction dampers for base isolation structure, and compiled the analysis program.(3) Analysis the Benchmark structure seismic response with non-control, passive control and semi-active control under different load condition. The structure parameters, the restoring force model of different control algorithm and damping control effect are analyzed in theory, discusses the various isolation setting of vibration damping effect.The results show that the variable semi-active friction combined isolation control can greatly improve the performance of performance of the Benchmark structure. Improved Bouc-Wen model can well simulate the hysteretic characteristics of variable friction damper.Based on the semi-active control effect of speed feedback is better than that of displacement feedback semi-active control. The decorate damper closer to the center of mass the control effect better for eccentric structure.