Stochastic response of seismically isolated highway bridges with friction pendulum systems to spatially varying earthquake ground motions
Stochastic response of seismically isolated highway bridges with friction pendulum systems to spatially varying earthquake ground motions
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DOI：
10.1016/j.engstruct.2005.05.016
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发表时间：
2005-11
影响因子：
5.5
通讯作者：
Ş. Ateş;A. A. Dumanoglu-A.;A. Bayraktar
中科院分区：
文献类型：
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作者：
Ş. Ateş;A. A. Dumanoglu-A.;A. Bayraktar
本文研究了带有摩擦摆系统的隔震公路桥梁在空间变化的地震地面运动作用下的随机响应。空间变化的地震地面运动模型包括不相干效应、波通过效应和场地响应效应。通过考虑 Harichandran 和 Vanmarcke 相干模型来检查不相干效应。通过使用不同的波速来研究波通过的效果。选择均质的软土、中土和硬土类型，以考虑桥梁支座施工地点的场地响应效应。地面运动由过滤后的白噪声描述并应用于每个支撑点。由于摩擦摆系统凹面上存在摩擦，运动方程是非线性的。非线性运动方程通过使用非线性随机分析的等效线性化技术来求解。作者用 FORTRAN 语言对摩擦摆系统的行为进行了编程，并将其合并到 SVEM 程序中。针对地面运动模型的特殊情况，对非孤立桥和孤立桥对空间变化的地震地面运动的随机分析所获得的解进行了相互比较。结论是，摩擦摆系统对桥梁对空间变化的地震地面运动的随机响应具有重要影响。
In this paper, stochastic responses of seismically isolated highway bridges with friction pendulum systems subjected to spatially varying earthquake ground motions are investigated. The spatially varying earthquake ground motion model includes incoherence, wave-passage and site-response effects. The incoherence effect is examined by considering the Harichandran and Vanmarcke coherency model. The effect of the wave-passage is investigated by using various wave velocities. Homogeneous soft, medium and firm soil types are selected for considering the site-response effect where the bridge supports are constructed. The ground motion is described by filtered white noise and applied to each support point. Due to the presence of friction on the concave surface of the frictional pendulum system, the equation of motion is non-linear. The non-linear equation of motion is solved by using equivalent linearization techniques of non-linear stochastic analyses. The frictional pendulum system’s behaviour is programmed in the FORTRAN language by the authors and incorporated into the program SVEM. Solutions obtained from the stochastic analyses of non-isolated and isolated bridges to spatially varying earthquake ground motions are compared with each other for the special cases of the ground motion model. It is concluded that friction pendulum systems have important effects on the stochastic responses of bridges to spatially varying earthquake ground motions.