Smart Structures and Systems

테크노프레스 (Techno-Press)
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Modal identification of Canton Tower under uncertain environmental conditions

  • Ye, Xijun (School of Civil Engineering and Transportation, South China University of Technology) ;
  • Yan, Quansheng (School of Civil Engineering and Transportation, South China University of Technology) ;
  • Wang, Weifeng (School of Civil Engineering and Transportation, South China University of Technology) ;
  • Yu, Xiaolin (School of Civil Engineering and Transportation, South China University of Technology)
  • 투고 : 2011.11.08
  • 심사 : 2012.04.10
  • 발행 : 2012.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

The instrumented Canton Tower is a 610 m high-rise structure, which has been considered as a benchmark problem for structural health monitoring (SHM) research. In this paper, an improved automatic modal identification method is presented based on a natural excitation technique in conjunction with the eigensystem realization algorithm (NExT/ERA). In the proposed modal identification method, damping ratio, consistent mode indicator from observability matrices (CMI_O) and modal amplitude coherence (MAC) are used as criteria to distinguish the physically true modes from spurious modes. Enhanced frequency domain decomposition (EFDD), the data-driven stochastic subspace identification method (SSI-DATA) and the proposed method are respectively applied to extract the modal parameters of the Canton Tower under different environmental conditions. Results of modal parameter identification based on output-only measurements are presented and discussed. User-selected parameters used in those methods are suggested and discussed. Furthermore, the effect of environmental conditions on the dynamic characteristics of Canton tower is investigated.

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참고문헌

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