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Structural Engineering and Mechanics
  Volume 79, Number 6, September25 2021 , pages 699-709

Simultaneous Identification of structures and unknown seismic excitations for chain-like systems with unknown mass using partial absolute responses
Hao Qiu, Jinshan Huang and Zhupeng Zheng

    It is necessary to identify structures with unknown mass and unknown seismic excitations simultaneously, but very limited methods have been proposed. In this paper, an algorithm is proposed to identify structural element mass, stiffness, and seismic excitations using only partial absolute structural responses of chain-like systems. In the first stage, the identification of structural element stiffness-mass coupled coefficients and unknown seismic excitations is conducted based on the generalized extended Kalman filter with unknown input (GEKF-UI) developed by the authors. In the second stage, these coupled coefficients are decoupled by cluster analysis and the least squares estimation (LSE) to obtain structural element stiffness and mass changes. The effectiveness of the proposed algorithm is numerically investigated using a four-story frame structure under three scenarios of changed conditions. Moreover, experimental validation by the shaking table test of a shear structure under two scenarios is also performed to identify structures and seismic excitations simultaneously.
Key Words
    extended Kalman filter; partial absolute measurement; seismic excitation; structural identification; unknown input; unknown mass
Hao Qiu, Jinshan Huang and Zhupeng Zheng: Department of Civil Engineering, Xiamen University, Xiamen 361005, China

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