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For a three-dimensional nonlinear numerical model of a structural network system consisting of linear elements and nonlinear ones considering elastoplastic behaviours, phenomenological and geometrical nonlinearities, the coupling vibration mechanism between the different modes of the system was clarified when the stiffness of the dominant structural parameter of the system was varied. The interaction of the dynamic responses of the linear and nonlinear elements to extreme non-stationary disturbances on the structural network system was clarified for the aforementioned changes in the structural parameter. The cable-stayed bridge infrastructure is taken as a representative example of the structural network system, and the axial stiffness of the elastic restraint cables is taken as the dominant structural parameter for the coupling vibration characteristics of the system. The coupled modes of the first swing mode of the girder and the first laterally symmetric bending mode were observed as the axial stiffness of the elastic restraint cables varied. Therefore, changes in the responses were observed in the main structural members of the main girder and cables, and the interactions of nonlinear responses of structural members such as the foundation and the piers were observed.

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Dynamic Characteristics of a Long-Period, Cable-Stayed Bridge Infrastructure Subjected to Seismic Waveforms

  • 会议论文

  • 发表日期：

    2025年

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  • Kakeru Sagara,
  • Gaku Shoji

摘要

For a three-dimensional nonlinear numerical model of a structural network system consisting of linear elements and nonlinear ones considering elastoplastic behaviours, phenomenological and geometrical nonlinearities, the coupling vibration mechanism between the different modes of the system was clarified when the stiffness of the dominant structural parameter of the system was varied. The interaction of the dynamic responses of the linear and nonlinear elements to extreme non-stationary disturbances on the structural network system was clarified for the aforementioned changes in the structural parameter. The cable-stayed bridge infrastructure is taken as a representative example of the structural network system, and the axial stiffness of the elastic restraint cables is taken as the dominant structural parameter for the coupling vibration characteristics of the system. The coupled modes of the first swing mode of the girder and the first laterally symmetric bending mode were observed as the axial stiffness of the elastic restraint cables varied. Therefore, changes in the responses were observed in the main structural members of the main girder and cables, and the interactions of nonlinear responses of structural members such as the foundation and the piers were observed.