Experimental study on parameter identification of rubber-bearings based on quadratic sum-squares error

In this paper, the QSSE method has been used for experimental study on parameter identification of rubber-bearings, the experimental model of rubber-bearings has been built and the widely used Bouc-Wen model has been investigated to represent the hysteretic behavior of rubber-bearing isolators. Further, experimental tests using a particular type of rubber-bearing (GZN110) have been conducted to measure base accelerations and model accelerations. Based on experimental vibration data measured from sensors, the QSSE method is used to identify the model parameters and displacements. Experimental results demonstrate that the estimated parameters are identical, and the identified displacements match the experimental ones well based on different excitation scenarios, i.e., different kinds of earthquakes with different peak ground accelerations. The influence on the estimated parameters based on the changes of initial parameters is little. It demonstrates that the Bouc-Wen model is capable of describing the nonlinear behavior of rubber-bearings. Compared with the EKF method, the QSSE method calculates faster, which demonstrates that the QSSE approach has better robustness and calculation efficiency and is quite effective and accurate for parameter identification of nonlinear hysteretic rubber-bearings.

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