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Chung Bang Yun - One of the best experts on this subject based on the ideXlab platform.

  • Identification of the Soil–Structure Interaction System Using Earthquake Response Data
    Journal of Engineering Mechanics, 2004
    Co-Authors: Jun-seong Choi, Jong Seh Lee, Chung Bang Yun
    Abstract:

    This paper demonstrates how system identification techniques can be successfully applied to a soil–structure interaction system using the Earthquake Response data. The parameters identified are the shear moduli of several near-field soil regions and Young’s moduli of the shell sections of the structure. The soil–structure interaction system is modeled by the finite element method combined with the infinite element formulation for the unbounded layered soil medium. The simulated Earthquake Responses using the identified parameters are shown to be in excellent agreement with the observed Response data. Prediction of the Responses is also carried out for a larger Earthquake event using the identified parameters as the initial properties in the equivalent linearization procedure. It has been found that the predicted Responses are also compared very well with the measured Responses.

  • Input and system identification of the Hualien soil–structure interaction system using Earthquake Response data
    Earthquake Engineering & Structural Dynamics, 2003
    Co-Authors: Jun-seong Choi, Jong Seh Lee, Chung Bang Yun
    Abstract:

    This paper presents an input and system identification technique for a soil–structure interaction system using Earthquake Response data. Identification is carried out on the Hualien large-scale seismic test structure, which was built in Taiwan for international joint research. The identified quantities are the input ground acceleration as well as the shear wave velocities of the near-field soil regions and Young's moduli of the shell sections of the structure. The Earthquake Response analysis on the soil–structure interaction system is carried out using the finite element method incorporating the infinite element formulation for the unbounded layered soil medium and the substructured wave input technique. The criterion function for the parameter estimation is constructed using the frequency Response amplitude ratios of the Earthquake Responses measured at several points of the structure, so that the information on the input motion may be excluded. The constrained steepest descent method is employed to obtain the revised parameters. The simulated Earthquake Responses using the identified parameters and input ground motion show excellent agreement with the measured Responses. Copyright © 2003 John Wiley & Sons, Ltd.

Neil Popplewell - One of the best experts on this subject based on the ideXlab platform.

  • tuned liquid dampers for controlling Earthquake Response of structures
    Earthquake Engineering & Structural Dynamics, 2000
    Co-Authors: Pradipta Banerji, Mohan Murudi, A H Shah, Neil Popplewell
    Abstract:

    Numerical simulations of a single-degree-of-freedom (SDOF) structure, rigidly supporting a tuned liquid damper (TLD) and subjected to both real and artificially generated Earthquake ground motions, show that a properly designed TLD can significantly reduce the structure's Response to these motions. The TLD is a rigid, rectangular tank with shallow water in it. Its fundamental linear sloshing frequency is tuned to the structure's natural frequency. The TLD is more effective in reducing structural Response as the ground excitation level increases. This is because it then dissipates more energy due to sloshing and wave breaking. A larger water-depth to tank-length ratio than previous studies suggested, which still falls within the constraint of shallow water theory, is shown to be more suitable for excitation levels expected in strong Earthquake motions. A larger water-mass to structure-mass ratio is shown to be required for a TLD to remain equally effective as structural damping increases. Furthermore, the reduction in Response is seen to be fairly insensitive to the bandwidth of the ground motion but is dependent on the structure's natural frequency relative to the significant ground frequencies. Finally, a practical approach is suggested for the design of a TLD to control Earthquake Response. Copyright © 2000 John Wiley & Sons, Ltd.

Jun-seong Choi - One of the best experts on this subject based on the ideXlab platform.

  • Identification of the Soil–Structure Interaction System Using Earthquake Response Data
    Journal of Engineering Mechanics, 2004
    Co-Authors: Jun-seong Choi, Jong Seh Lee, Chung Bang Yun
    Abstract:

    This paper demonstrates how system identification techniques can be successfully applied to a soil–structure interaction system using the Earthquake Response data. The parameters identified are the shear moduli of several near-field soil regions and Young’s moduli of the shell sections of the structure. The soil–structure interaction system is modeled by the finite element method combined with the infinite element formulation for the unbounded layered soil medium. The simulated Earthquake Responses using the identified parameters are shown to be in excellent agreement with the observed Response data. Prediction of the Responses is also carried out for a larger Earthquake event using the identified parameters as the initial properties in the equivalent linearization procedure. It has been found that the predicted Responses are also compared very well with the measured Responses.

  • Input and system identification of the Hualien soil–structure interaction system using Earthquake Response data
    Earthquake Engineering & Structural Dynamics, 2003
    Co-Authors: Jun-seong Choi, Jong Seh Lee, Chung Bang Yun
    Abstract:

    This paper presents an input and system identification technique for a soil–structure interaction system using Earthquake Response data. Identification is carried out on the Hualien large-scale seismic test structure, which was built in Taiwan for international joint research. The identified quantities are the input ground acceleration as well as the shear wave velocities of the near-field soil regions and Young's moduli of the shell sections of the structure. The Earthquake Response analysis on the soil–structure interaction system is carried out using the finite element method incorporating the infinite element formulation for the unbounded layered soil medium and the substructured wave input technique. The criterion function for the parameter estimation is constructed using the frequency Response amplitude ratios of the Earthquake Responses measured at several points of the structure, so that the information on the input motion may be excluded. The constrained steepest descent method is employed to obtain the revised parameters. The simulated Earthquake Responses using the identified parameters and input ground motion show excellent agreement with the measured Responses. Copyright © 2003 John Wiley & Sons, Ltd.

Jong Seh Lee - One of the best experts on this subject based on the ideXlab platform.

  • Identification of the Soil–Structure Interaction System Using Earthquake Response Data
    Journal of Engineering Mechanics, 2004
    Co-Authors: Jun-seong Choi, Jong Seh Lee, Chung Bang Yun
    Abstract:

    This paper demonstrates how system identification techniques can be successfully applied to a soil–structure interaction system using the Earthquake Response data. The parameters identified are the shear moduli of several near-field soil regions and Young’s moduli of the shell sections of the structure. The soil–structure interaction system is modeled by the finite element method combined with the infinite element formulation for the unbounded layered soil medium. The simulated Earthquake Responses using the identified parameters are shown to be in excellent agreement with the observed Response data. Prediction of the Responses is also carried out for a larger Earthquake event using the identified parameters as the initial properties in the equivalent linearization procedure. It has been found that the predicted Responses are also compared very well with the measured Responses.

  • Input and system identification of the Hualien soil–structure interaction system using Earthquake Response data
    Earthquake Engineering & Structural Dynamics, 2003
    Co-Authors: Jun-seong Choi, Jong Seh Lee, Chung Bang Yun
    Abstract:

    This paper presents an input and system identification technique for a soil–structure interaction system using Earthquake Response data. Identification is carried out on the Hualien large-scale seismic test structure, which was built in Taiwan for international joint research. The identified quantities are the input ground acceleration as well as the shear wave velocities of the near-field soil regions and Young's moduli of the shell sections of the structure. The Earthquake Response analysis on the soil–structure interaction system is carried out using the finite element method incorporating the infinite element formulation for the unbounded layered soil medium and the substructured wave input technique. The criterion function for the parameter estimation is constructed using the frequency Response amplitude ratios of the Earthquake Responses measured at several points of the structure, so that the information on the input motion may be excluded. The constrained steepest descent method is employed to obtain the revised parameters. The simulated Earthquake Responses using the identified parameters and input ground motion show excellent agreement with the measured Responses. Copyright © 2003 John Wiley & Sons, Ltd.

Pradipta Banerji - One of the best experts on this subject based on the ideXlab platform.

  • tuned liquid dampers for controlling Earthquake Response of structures
    Earthquake Engineering & Structural Dynamics, 2000
    Co-Authors: Pradipta Banerji, Mohan Murudi, A H Shah, Neil Popplewell
    Abstract:

    Numerical simulations of a single-degree-of-freedom (SDOF) structure, rigidly supporting a tuned liquid damper (TLD) and subjected to both real and artificially generated Earthquake ground motions, show that a properly designed TLD can significantly reduce the structure's Response to these motions. The TLD is a rigid, rectangular tank with shallow water in it. Its fundamental linear sloshing frequency is tuned to the structure's natural frequency. The TLD is more effective in reducing structural Response as the ground excitation level increases. This is because it then dissipates more energy due to sloshing and wave breaking. A larger water-depth to tank-length ratio than previous studies suggested, which still falls within the constraint of shallow water theory, is shown to be more suitable for excitation levels expected in strong Earthquake motions. A larger water-mass to structure-mass ratio is shown to be required for a TLD to remain equally effective as structural damping increases. Furthermore, the reduction in Response is seen to be fairly insensitive to the bandwidth of the ground motion but is dependent on the structure's natural frequency relative to the significant ground frequencies. Finally, a practical approach is suggested for the design of a TLD to control Earthquake Response. Copyright © 2000 John Wiley & Sons, Ltd.