Comparative Investigation on Optimal Viscous Damper Placement for Elastic-Plastic MDOF Structures: Transfer Function Amplitude or Double Impulse
Comparative Investigation on Optimal Viscous Damper Placement for Elastic-Plastic MDOF Structures: Transfer Function Amplitude or Double Impulse
复制标题
弹塑性多自由度结构最佳粘性阻尼器放置的比较研究：传递函数振幅或双脉冲
DOI：
10.1016/j.soildyn.2019.105987
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发表时间：
2020
影响因子：
4
通讯作者：
I. Takewaki
中科院分区：
文献类型：
--
作者：
H. Akehashi;I. Takewaki
通过与基于固有频率传递函数幅值设计的弹性多自由度结构阻尼器优化布置的比较，证明了临界双冲击下粘滞阻尼器优化布置的有效性。针对以近断层地震动为代表的临界双冲击作用下的弹塑性多自由度结构，提出了粘滞阻尼器的最优布置方法[1]。双脉冲由两个方向相反的脉冲组成，其临界区间由最大输入能量判据确定。第二次冲击的临界时间是要求第一层恢复力和阻尼力之和消失的时间。通过对三种主要结构层刚度分布不同的模型进行处理，验证了临界双冲击下粘性阻尼器优化布置的有效性。本文进一步研究了前文中提出的用于确定临界双脉冲输入速度水平的双脉冲推覆（DIP）方法。结果表明，在临界双脉冲作用下，弹塑性多自由度结构粘滞阻尼器的最佳配置比基于固有频率传递函数幅值的最佳配置对脉冲型记录地震动更有效，因为双脉冲作用下弹塑性响应产生的几种高模态可以很好地控制在脉冲型记录地震动下。
The effectiveness of the optimal viscous damper placement for elastic-plastic multi-degree-of-freedom (MDOF) structures under the critical double impulse is demonstrated through the comparison with the optimal damper placement for elastic MDOF structures designed with respect to transfer function amplitudes at natural frequencies. The method for optimal viscous damper placement was proposed for elastic-plastic MDOF structures subjected to the critical double impulse as a representative of near-fault ground motions in the previous paper [1]. The double impulse is composed of two impulses with opposite directions and the critical interval is determined by using the criterion on the maximum input energy. The critical timing of the second impulse was found to be the timing which requires the vanishing of the sum of the restoring force and the damping force in the first story. Three models with different story stiffness distributions of main structures are treated to demonstrate the effectiveness of the optimal viscous damper placement under the critical double impulse. The double impulse pushover (DIP) procedure proposed in the previous paper for determining the input velocity level of the critical double impulse is examined further in this paper. It is demonstrated that the optimal viscous damper placement for elastic-plastic MDOF structures under the critical double impulse is more effective for pulse-type recorded earthquake ground motions than the optimal damper placement designed with respect to transfer function amplitudes at natural frequencies because several higher modes arising in the elastic-plastic response under pulse-type recorded earthquake ground motions can be well controlled by the design for the double impulse.