| Probabilistic seismic response and reliability assessment of isolated bridges |
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| 作者姓名： | GiuseppeCarloMarano |
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| 作者单位： | DepartmentofEnvironmentalEngineeringandSustainableDevelopment,TechnicalUniversityofBariTaranto,Italy |
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| 摘 要： | Bridge seismic isolation strategy is based on the reduction of shear forces transmitted from the superstructure to the piers by two means: shifting natural period and earthquake input energy reduction by dissipation concentrated in protection devices. In this paper, a stochastic analysis of a simple isolated bridge model for different bridge and device parameters is conducted to assess the efficiency of this seismic protection strategy. To achieve this aim, a simple nonlinear softening constitutive law is adopted to model a wide range of isolation devices, characterized by only three essential mechanical parameters. As a consequence of the random nature of seismic motion, a probabilistic analysis is carried out and the time modulated Kanai-Tajimi stochastic process is adopted to represent the seismic action. The response covariance in the state space is obtained by solving the Lyapunov equation for a stochastic linearized system. After a sensitivity analysis, the failure probability referred to extreme displacement and the mean value of dissipated energy are assessed by using the introduced stochastic indices of seismic bridge protection efficiency. A parametric analysis for protective devices with different mechanical parameters is developed for a proper selection of parameters of isolation devices under different situations.
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| 关 键 词： | 地震 地层学 地球构造 非线性滞后机械模型 |
| 收稿时间： | 28 April 2005 |
| 修稿时间： | 6 May 2005 |
Probabilistic seismic response and reliability assessment of isolated bridges |
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| GiuseppeCarloMarano.Probabilistic seismic response and reliability assessment of isolated bridges[J].Earthquake Engineering and Engineering Vibration,2005,4(1):95-106. |
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| Authors: | Email author" target="_blank">Giuseppe?Carlo?MaranoEmail author |
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| Institution: | Department of Environmental Engineering and Sustainable Development, Technical University of Bari, Taranto, Italy |
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| Abstract: | Bridge seismic isolation strategy is based on the reduction of shear forces transmitted from the superstructure to the piers by two means: shifting natural period and earthquake input energy reduction by dissipation concentrated in protection devices. In this paper, a stochastic analysis of a simple isolated bridge model for different bridge and device parameters is conducted to assess the efficiency of this seismic protection strategy. To achieve this aim, a simple nonlinear softening constitutive law is adopted to model a wide range of isolation devices, characterized by only three essential mechanical parameters. As a consequence of the random nature of seismic motion, a probabilistic analysis is carried out and the time modulated Kanai-Tajimi stochastic process is adopted to represent the seismic action. The response covariance in the state space is obtained by solving the Lyapunov equation for a stochastic linearized system. After a sensitivity analysis, the failure probability referred to extreme displacement and the mean value of dissipated energy are assessed by using the introduced stochastic indices of seismic bridge protection efficiency. A parametric analysis for protective devices with different mechanical parameters is developed for a proper selection of parameters of isolation devices under different situations. |
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| Keywords: | bridge seismic isolation stochastic analysis nonlinear softening constitutive law reliability assessment |
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