Robust Optimal Damper Placement of Nonlinear Oil Dampers With Uncertainty Using Critical Double Impulse
Robust Optimal Damper Placement of Nonlinear Oil Dampers With Uncertainty Using Critical Double Impulse
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DOI：
10.3389/fbuil.2021.744973
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
K. Fujita;Ryo Wataya;I. Takewaki
中科院分区：
文献类型：
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作者：
K. Fujita;Ryo Wataya;I. Takewaki
针对建筑结构在临界双冲量作用下的阻尼器优化配置问题，提出了一种新的鲁棒方法。本文将油阻尼器作为控制高层建筑地震反应的典型附加阻尼器。这种油阻尼器通常服从双线性力-速度关系，通过释放机构控制最大阻尼力，以避免在周围框架中出现过大的设计力。研究了双线性油阻尼器特性的不确定性对建筑结构安全性的影响。为了有效地评价结构的动力性能，采用共振临界双冲量代替实际地震动作为基本输入。由于临界双脉冲被确定为通过改变第二脉冲定时来最大化目标建筑物的输入能量，因此可以以鲁棒的方式考虑输入地震动中的不确定性。为了考虑这些不同的不确定性，鲁棒性功能的基础上的信息差距模型被用于在鲁棒优化，以评估结构性能变化所造成的各种不确定性在结构设计阶段。本文提出了一种新的鲁棒最优阻尼器配置问题的目标函数，以提高结构性能的鲁棒性下的结构参数的变化，通过比较鲁棒设计的鲁棒性函数与普通的阻尼器优化配置，不考虑不确定性。线性和双线性油阻尼器放置的鲁棒优化设计的数值例子显示为10层和20层的平面建筑框架模型。通过对常规设计地震动作用下结构稳健优化设计的性能分析，探讨了在不确定性条件下采用临界双冲量进行结构设计的有效性。
A new robust method for optimal damper placement is presented for building structures under the critical double impulse. Oil dampers are treated here as representative supplemental dampers to control the seismic response of high-rise buildings. Such oil dampers usually obey a bi-linear force-velocity relation in controlling the maximum damping force through a relief mechanism to avoid the occurrence of excessive design forces in surrounding frames. The influence of uncertainty in characteristics of those bi-linear oil dampers on building structural safety is investigated. For the efficient evaluation of dynamic performance, the resonant critical double impulse is used as the base input instead of actual earthquake ground motions. Since the critical double impulse is determined to maximize the input energy to the objective building by changing the second impulse timing, uncertainties in input ground motions can be taken into account in a robust manner. To consider these various uncertainties, the robustness function based on the Info-Gap model is used in the robust optimization to assess structural performance variations caused by various uncertainties in the structural design phase. In this paper, a new innovative objective function in the robust optimal damper placement problem is proposed to enhance the robustness of structural performance under the variation of structural parameters by comparing the robustness function of the robust design with that of an ordinary optimal damper placement without considering uncertainties. Numerical examples of the robust optimal design of linear and bi-linear oil damper placements are shown for 10-story and 20-story planar building frame models. Structural performances of the robust optimal design to the conventional design earthquake ground motions are examined to investigate the validity of using the critical double impulse in the structural design under uncertainties.