An inerter-equipped vibrating barrier for noninvasive motion control of seismically excited structures
An inerter-equipped vibrating barrier for noninvasive motion control of seismically excited structures
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DOI：
10.1002/stc.2474
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发表时间：
2019-12-17
影响因子：
5.4
通讯作者：
Giaralis, Agathoklis
中科院分区：
文献类型：
--
作者：
Cacciola, Pierfrancesco;Tombari, Alessandro;Giaralis, Agathoklis
振动屏障（ViBa）是一种包含在地面中的大型振荡质量弹簧阻尼器单元，通过结构-土壤-结构相互作用机制，在地震引起的地面震动下进行调谐以减轻周围结构的运动，而不直接接触它们。先前的研究表明，ViBa实现了显着的地震结构响应降低，但这样做，它需要过多的振动质量，等于或更多的结构，旨在控制的质量，这阻碍了其实用性。本文考虑将ViBa与作为质量放大器的接地惯性器耦合，以减少ViBa质量/重量，从而抑制地震引起的结构响应。注意力集中在适合建模为单自由度（SDOF）阻尼振荡器的结构，通过建立一个5-DOF动力系统的接地惯性装备的ViBa（IViBa）与SDOF结构融合的运动方程，并占土壤-结构相互作用的影响，由于土壤的顺应性。分别研究了单自由度结构在谐波共振和宽带/白色基底激励下的响应最小化问题。有关的一个小规模的物理ViBa原型标本的数值结果提供量化IViBa质量和惯性之间的权衡考虑非刚性/顺应惯性到地面的连接。在白色静止和有色非静止地震激励下，发现固定目标结构性能的单调IViBa质量/重量减少趋势，以增加惯性和足够刚性的惯性-地面连接。它的结论是，仔细的工程设计的惯性器接地连接最小化的遵守是最关键的充分利用接地惯性器的有益效果，质量/重量IViBa减少促进，因此，其实际实施。
The vibrating barrier (ViBa) is a large-scale oscillating mass-spring-damper unit contained in the ground and tuned to mitigate the motion of surrounding structures under earthquake-induced ground shaking, without being directly in contact to them, through a structure-soil-structure interaction mechanism. Previous research showed that ViBa achieves significant seismic structural response reductions, but in doing so, it requires excessive vibrating mass, equal to the mass of the structure that aims to control or more, which hinders its practical applicability. This paper considers coupling ViBa with a grounded inerter acting as a mass amplifier to reduce ViBa mass/weight in suppressing seismically induced structural response. Attention is focused on structures amenable to modelling as single-degree-of-freedom (SDOF) damped oscillators by establishing equations of motion of a 5-DOF dynamical system of a grounded inerter-equipped ViBa (IViBa) fused with an SDOF structure and accounting for soil-structure interaction effects due to soil compliance. Optimal closed-form H-infinity and numerical H-2 IViBa tuning are addressed minimizing the response of SDOF structure subject to harmonic resonant and to broadband/white base excitation, respectively. Numerical results pertaining to a small-scale physical ViBa prototype specimen are furnished quantifying the trade-off between IViBa mass and inertance considering non-rigid/compliant inerter-to-ground connectivity. Monotonic IViBa mass/weight reduction trend is found for fixed targeted structural performance under white stationary as well as coloured nonstationary seismic excitation for increasing inertance and for sufficiently rigid inerter-to-ground connection. It is concluded that careful engineering design of the inerter-to-ground connection minimizing compliance is most critical in fully exploiting the beneficial effects of grounded inerter for mass/weight IViBa reduction facilitating, thus, its practical implementation.