Abstract Recent deployments of Earthquake Early Warning (EEW) system in Japan and some other earthquake-prone regions provide the vital warning signals prior to the arrival of destructive ground motions. The EEW system uses the different traveling speed of seismic P- and S-waves to achieve the goal of earthquake warning. This technology is primarily used to produce warning signals to alert the public to avoid potential risks, such as to evacuate from buildings. It is also used to mitigate other risks such as reducing train speed of Shinkansen trains. The present study suggests a new seismic-risk mitigation technique by connecting a base isolation system with the EEW. Base isolation is a mature technology which decouples structure from its base and lengthens its natural period of vibration. However, existing base isolation devices must possess certain lateral resistance to withstand service lateral forces such as wind, and such stiffness hinders the effectiveness of vibration isolation. In addition, supplementary damping devices are sometimes added to control excessive displacements in isolation level. This paper proposes a smart system which changes the property of a base isolation system upon EEW signal. In normal times when earthquake risk is not present, the base isolation system is locked by shear keys. When an earthquake is signalled by the EEW system, a mechanical system releases the base isolation system. When the earthquake ceases, the system resets and base isolation is locked again. On-board vibration sensors are added to activate the system in case of EEW fails to detect incoming waves. A crucial benefit of the system is that supplementary damper is no longer required to control excessive isolator displacements, and elastic stiffness of base isolation is no longer required to re-enter the base isolation system. The result is that it maximizes the vibration isolation effectiveness. A conceptual framework of proposed system is described and demonstrated by laboratory-scaled experiments. A 6-storey test frame is excited on a shake table subjected to historical earthquakes. Results indicates that the proposed system is effective in reducing earthquake responses on the building. It is an IoT-enabled earthquake-risk mitigation system.

中文翻译：

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启用地震预警的智能基地隔离系统

摘要 日本和其他一些地震多发地区最近部署的地震早期预警 (EEW) 系统在破坏性地面运动到来之前提供了重要的预警信号。EEW系统利用地震P波和S波传播速度的不同来达到地震预警的目的。该技术主要用于产生警告信号以提醒公众避免潜在风险，例如从建筑物中疏散。它还用于减轻其他风险，例如降低新干线列车的列车速度。本研究通过将基础隔离系统与 EEW 连接起来，提出了一种新的地震风险缓解技术。底座隔震是一种成熟的技术，可将结构与底座分离，延长其固有振动周期。然而，现有的基础隔振装置必须具有一定的侧向阻力才能承受风等服务侧向力，而这种刚度阻碍了隔振的有效性。此外，有时会添加辅助阻尼装置来控制隔离级别的过度位移。本文提出了一种智能系统，可根据 EEW 信号改变基础隔离系统的特性。在不存在地震风险的正常情况下，基础隔离系统由剪切键锁定。当 EEW 系统发出地震信号时，机械系统会释放基础隔离系统。当地震停止时，系统会重置，基地隔离再次锁定。添加机载振动传感器以在 EEW 无法检测到传入波的情况下激活系统。该系统的一个关键好处是不再需要辅助阻尼器来控制隔离器的过度位移，并且不再需要底座隔离的弹性刚度来重新进入底座隔离系统。结果是它最大限度地提高了隔振效果。通过实验室规模的实验描述和证明了所提出系统的概念框架。在经受历史地震的振动台上激励一个 6 层高的试验框架。结果表明，所提出的系统在减少建筑物的地震反应方面是有效的。这是一个支持物联网的地震风险缓解系统。结果是它最大限度地提高了隔振效果。通过实验室规模的实验描述和证明了所提出系统的概念框架。在经受历史地震的振动台上激励一个 6 层高的试验框架。结果表明，所提出的系统在减少建筑物的地震反应方面是有效的。它是一个支持物联网的地震风险缓解系统。结果是它最大限度地提高了隔振效果。通过实验室规模的实验描述和证明了所提出系统的概念框架。在经受历史地震的振动台上激励一个 6 层高的试验框架。结果表明，所提出的系统在减少建筑物的地震反应方面是有效的。它是一个支持物联网的地震风险缓解系统。