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A smart mechatronic base isolation system using earthquake early warning

机译：利用地震预警的智能机电基础隔离系统

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In earthquake-prone countries such as Japan, effects of earthquakes are one of the major design objectives in buildings and infrastructures. Recent advances in earthquake engineering have improved the safety and reliability of buildings and infrastructures. Better understanding of geomorphology of earthquakes also enables us to better predict and estimate propagation of such natural hazard. For example, the Earthquake Early Warning (EEW) system in Japan provides advanced warnings using the different arrival times of P and S waves. On the other hand, techniques and methods in passive, semi-active and active vibration control have flourished. Base-isolation is a proven technique which enhances earthquake resilience of buildings and bridges. In general, this technique involves decoupling a superstructure from its foundation and lengthens its natural period of vibration. This technique is mature and commercialization has taken place worldwide. However, wind-resistance of base-isolated structures is generally a concern as the lateral stiffness of a base-isolated structure is low and service-ability wind effects may induce unacceptable lateral movement and/or vibration of the structure. This paper presents a new concept which the base-isolation system is activated by EEW system through a mechatronic system. In other times the structure is not base-isolated and provides strong lateral resistance against wind loads. As a backup design, the proposed system also equips with its own network of accelerometers which can trigger base isolation system independent from EEW system. The smart mechatronic base isolation system is fully automated, and resets itself after each ground motion. The paper describes the conceptual framework of proposed system and presents laboratory-scaled proof-of-concept experiments. Four historical earthquake time histories were used as ground excitations. Structural responses are compared between the two triggering mechanisms and results are discussed. Finally, the concept of Internet of Things (IoT) which make use of EEW is discussed, allowing connectivity between a single control unit and a network of infrastructures to achieve economy of scale.
机译：在日本等地震多发国家，地震影响是建筑物和基础设施的主要设计目标之一。地震工程学的最新进展提高了建筑物和基础设施的安全性和可靠性。对地震地貌的更好理解也使我们能够更好地预测和估计这种自然灾害的传播。例如，日本的地震预警（EEW）系统使用P波和S波的不同到达时间来提供高级警报。另一方面，被动，半主动和主动振动控制的技术和方法蓬勃发展。基础隔离是一种经过验证的技术，可以增强建筑物和桥梁的抗震能力。通常，该技术涉及将上部结构与其基础分离，并延长其自然振动周期。该技术已经成熟，并且已经在世界范围内商业化。但是，通常需要考虑基础隔离结构的抗风性，因为基础隔离结构的侧向刚度较低，并且可维修性风效应可能会导致结构出现不可接受的横向移动和/或振动。本文提出了一种新的概念，即基础隔离系统通过机电系统由EEW系统激活。在其他时候，该结构不是基础隔离的，并提供了强大的抗风荷载的侧向阻力。作为备份设计，拟议的系统还配备了自己的加速度计网络，该网络可以触发独立于EEW系统的基本隔离系统。智能机电一体化基础隔离系统是完全自动化的，并在每次地面运动后自行复位。本文描述了所提出系统的概念框架，并提出了实验室规模的概念验证实验。四个历史地震时间历史被用作地面激励。比较了两种触发机制之间的结构响应，并讨论了结果。最后，讨论了利用EEW的物联网（IoT）的概念，该概念允许单个控制单元与基础结构网络之间的连接以实现规模经济。

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