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Chen, Zhongwei

University of British Columbia

The structural response under earthquake excitation can be simulated by shake table tests. However, the performance of the shake table is affected by the Control-Structure Interaction (CSI) effect. In recent years, nonlinear control algorithms were developed to compensate for the CSI effect. In this study, a model reference adaptive control algorithm, named model reference adaptive hierarchical control (MRAHC) framework, is presented. MRAHC consists of a high (adaptive) and low (loop-shaping) level controller. The high-level controller develops the control algorithm on the system level, which directedly considers the inherent nonlinearity of the test specimen and the CSI effect. While the low-level controller develops the control algorithm to regulate the hydraulic system and make sure it can follow the reference signal generated by the high-level controller. MRAHC offers many advantages including the ability to handle the CSI effect and the structural nonlinearity. In addition, it allows users to quantify the structural properties such as mass, stiffness, and damping. To evaluate the performance of the MRAHC method, shake table tests of a multi-degree of freedom system with different masses were carried out. The performance of the MRAHC was compared with the direct loop-shaping control method (LC) and the traditional Proportional-Integral-Differentiation (PID) control method. The results show that the MRAHC can achieve better acceleration tracking compared to the LC and PID control methods. Especially, when the shake table has CSI effect and structural nonlinearity. Hence, the MRAHC can be used as an effective nonlinear controller for shake table tests.

Text

2024-04-18

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/87877

Civil Engineering

University of British Columbia

UBCV

http://creativecommons.org/licenses/by-nc-nd/4.0/