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Effect of inerter for seismic mitigation comparing with base isolation

机译：惯性减震效果与基础隔震比较

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摘要

In this paper, the effect of inerter arranged at the bottom of the structure on seismic mitigation is studied in comparison with base isolation system (BIS). First, a simplified two degree-of-freedoms (DOFs) structure is used to study the influence of the inerter on the modal characteristics and the transfer function of the structure by means of the analytical solutions. Second, regarding a multiple DOFs structure, an H-2-norm-based parameter optimization algorithm is used to find the optimal inertance-mass ratio, which is corresponding to the optimal structural damping performance. Finally, a numerical study is conducted to verify the feasibility of the optimization algorithm and the damping effect under the optimal parameters by simulations with artificial seismic waves. Related results have shown that with the increase of inertance, the addition of inerter in substructure is also effective in reducing the basic natural frequency and changing the first-order mode as BIS does. The H-2-norm evaluation of the simplified model shows the existence of the optimal inertance-mass ratio, which is finally verified by the optimization results on the multiple DOFs structure. Results have indicated the superiority of the inerter-based systems compared with the BIS in terms of the less dependence on site conditions, the better controlled displacement of the substructure and superstructure, and the less seismic energy input to the structure.
机译：与基础隔震系统（BIS）相比，研究了结构底部的惯性对减震的影响。首先，使用简化的两自由度（DOF）结构，通过解析解研究惯性对结构的模态特性和传递函数的影响。其次，对于多自由度结构，使用基于H-2-范数的参数优化算法来找到最佳惯性质量比，该最佳惯性质量比对应于最佳结构阻尼性能。最后，进行了数值研究，通过人工地震波仿真验证了优化算法的可行性和最优参数下的阻尼效果。相关结果表明，随着惯性的增加，在子结构中增加惯性也像BIS一样有效地降低了基本固有频率并改变了一阶模态。简化模型的H-2-范数评估显示了最佳惯性质量比的存在，并最终通过对多个自由度结构的优化结果进行验证。结果表明，与BIS相比，基于惯性系统的优势在于对现场条件的依赖性较小，下部结构和上部结构的位移控制得更好，并且输入到结构的地震能量更少。

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