近断层地震动下油阻尼器减震结构地震响应评估

Evaluation for the Seismic Response of Oil Damper Controlled Structures Under the Near-fault Ground Motions

以附加油阻尼器的减震结构为对象,建立了近断层地震动作用下该类结构地震响应的直接评估方法。选取127条脉冲型地震动,回归分析建立了基于地震动脉冲周期和最大速度等关键参数的速度谱模型;采用等价线性化方法建立了非线性油阻尼器减震结构的等价线性结构,并提出基于速度谱的结构位移和阻尼力的快速迭代求解方法。数值分析结果表明,该方法能基于地震动关键参数,较准确且快速地获得减震结构的位移和阻尼力响应,有助于提高减震设计效率。

A method for evaluating the seismic response of the structure with additional oil damper under impulsive ground motion was proposed.Through regression analysis on 127 impulsive ground motions,a velocity response spectra model was established based on the pulse period and the peak ground velocity of the ground motion.The structure with nonlinear oil damper was replaced by an equivalent linear structure using an equivalent linearization method,and the iterative method was proposed to predict the displacement and the damping force of the structure based on velocity spectra.The numerical analysis results show that the proposed method can obtain the displacement and damping force of the damped structure accurately directly from the key parameters of ground motions,which is helpful to improve the design efficiency.