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  • Open Access


    Nonlinear Vibration Analysis of Horizontal Bi-Directional Restoring Force Characteristics for Seismic Isolated Laminated Rubber

    Ayumi Takahashi1,*, Kenya Kashiwagi2, Tomoyuki Tsuchiya2, Kazuhito Misaji1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.24, No.1, pp. 1-1, 2022, DOI:10.32604/icces.2022.08705

    Abstract As a characteristic of seismic isolated laminated rubber, the rubber is torsional deformed when it was loaded in horizontal bi-direction, and breaks with less force than when loaded in unidirectional. It is necessary to extend the model which has been used for unidirectional analysis to the model which can be analyzed in bi-direction. As a previous study, Igarashi applied the Multiple Shear Springs (MSS) model which is a horizontal bi-directional model, and compared them with measured values to verify their validity [1]. The authors extended PFT-ELS method to MSS model which can analyze bidirection [2].… More >

  • Open Access


    Effect of Lead-Rubber Bearing Isolators in Reducing Seismic Damage for a High-Rise Building in Comparison with Normal Shear Wall System

    Mahmoud Fakih1,*, Jaafar Hallal1, Hassan Darwich2, Hala Damerji3

    Structural Durability & Health Monitoring, Vol.15, No.3, pp. 247-260, 2021, DOI:10.32604/sdhm.2021.015174

    Abstract Seismic earthquakes are a real danger for the construction evolution of high rise buildings. The rate of earthquakes around the world is noteworthy in a wide range of construction areas. In this study, we present the dynamic behavior of a high-rise RC building with dynamic isolators (lead-rubber-bearing), in comparison with a traditional shear wall system of the same building. Seismic isolation has been introduced in building construction to increase the structural stability and to protect the non-structural components against the damaging effects of an earthquake. In order to clarify the influence of incorporating lead rubber… More >

  • Open Access


    Nonlinear Vibration Analysis of Seismic-isolation Laminated Rubber Considering Bi-directional Restoring Force Model

    Ayumi Takahashi1,*, Tomoyuki Tsuchiya2, Keiichi Motoyama3, Kazuhito Misaji1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 15-15, 2021, DOI:10.32604/icces.2021.08354

    Abstract The seismic-isolation laminated rubber is used as a means of suppressing damage to the structures caused by an earthquake. To design the seismically isolated structure, it is important to calculate the dynamic response reflecting the rubbers characteristics accurately. The authors have applied the nonlinear vibration analysis method using the restoring force model of the power function type to the seismic response analysis of seismic isolation rubber in horizontal unidirectional [1-3]. However, when seismic isolation laminated rubber is loaded in horizontal bi-direction, the seismic isolation laminated rubber is torsional deformed and breaks with less force than… More >

  • Open Access


    Seismic Response Analysis of a High-Rise-Building with Seismic Isolation Rubber

    A. Takahashi1, K. Motoyama2, K. Misaji1,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.2, pp. 42-42, 2019, DOI:10.32604/icces.2019.05446

    Abstract Seismic isolation laminated rubber is used as an effective means for suppressing damage to buildings and people in buildings by earthquakes. The restoring-force characteristic of the rubber has non-linerar-vibration characteristics which depend on the displacement amplitude. PFT-ELS (Equivalent linear system using the restoring force model of power function type) has been applied for calculating approximate responses of various non-linear-vibration systems [Kazuhito, M., et al. (1994); Koichi, S., et al. (1995); Koichi, S., et al. (1996)]. The authors have also applied to optimize the non-linear vibration characteristics of the isolation rubber using PFT-ELS and GA [Ayumi,… More >

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