Structural Engineering and Mechanics

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Simultaneous Identification of structures and unknown seismic excitations for chain-like systems with unknown mass using partial absolute responses

  • Qiu, Hao (Department of Civil Engineering, Xiamen University) ;
  • Huang, Jinshan (Department of Civil Engineering, Xiamen University) ;
  • Zheng, Zhupeng (Department of Civil Engineering, Xiamen University)
  • Received : 2020.11.22
  • Accepted : 2021.07.15
  • Published : 2021.09.25
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Abstract

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.

Keywords

Acknowledgement

This research is supported by the National Natural Science Foundation of China (NSFC) through the Grant No. U171126 and Fujian Natural Science Foundation via the Grant No. 2019J01008.

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