Earthquakes and Structures

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Seismic response of a high-rise flexible structure under H-V-R ground motion

  • We, Wenhui (Hubei Key Laboratory of Road Bridge and Structure Engineering, Wuhan University of Technology) ;
  • Hu, Ying (Hubei Key Laboratory of Road Bridge and Structure Engineering, Wuhan University of Technology) ;
  • Jiang, Zhihan (Hubei Key Laboratory of Road Bridge and Structure Engineering, Wuhan University of Technology)
  • Received : 2019.03.29
  • Accepted : 2022.07.22
  • Published : 2022.08.25
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Abstract

To research the dynamic response of the high-rise structure under the rocking ground motion, which we believed that the effect cannot be ignored, especially accompanied by vertical ground motion. Theoretical analysis and shaking table seismic simulation tests were used to study the response of a high-rise structure to excitation of a H-V-R ground motion that included horizontal, vertical, and rocking components. The use of a wavelet analysis filtering technique to extract the rocking component from data for the primary horizontal component in the first part, based on the principle of horizontal pendulum seismogram and the use of a wavelet analysis filtering technique. The dynamic equation of motion for a high-rise structure under H-V-R ground motion was developed in the second part, with extra P-△ effect due to ground rocking displacement was included in the external load excitation terms of the equation of motion, and the influence of the vertical component on the high-rise structure P-△ effect was also included. Shaking table tests were performed for H-V-R ground motion using a scale model of a high-rise TV tower structure in the third part, while the results of the shaking table tests and theoretical calculation were compared in the last part, and the following conclusions were made. The results of the shaking table test were consistent with the theoretical calculation results, which verified the accuracy of the theoretical analysis. The rocking component of ground motion significantly increased the displacement of the structure and caused an asymmetric displacement of the structure. Thus, the seismic design of an engineering structure should consider the additional P-△ effect due to the rocking component. Moreover, introducing the vertical component caused the geometric stiffness of the structure to change with time, and the influence of the rocking component on the structure was amplified due to this effect.

Keywords

Acknowledgement

The research described in this paper was financially supported by the Natural Science Foundation of China under Grant No. 51678462, and Sanya Yazhou Bay Science and Technology City Administration Scientific research project (No. SKJC-KJ-2019 KY02).

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