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An isolation system for limited seismic gaps in near-fault zones

机译：断层附近有限地震缝隙的隔离系统

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The ability of a recently proposed seismic isolation system, with inherent self-stopping mechanism, to mitigate or even eliminate seismic pounding of adjacent structures is investigated under severe near-fault earthquakes. The isolation system is referred to as roll-in-cage (RNC) isolator. It is a rolling-based isolator that provides in one unit the necessary functions of vertical rigid support, horizontal flexibility with enhanced stability, hysteretic energy dissipation, and resistance to minor vibration loads. In addition, the RNC isolator is distinguished by a self-stopping (buffer) mechanism to limit the bearing displacement under excitations stronger than a design earthquake or at limited seismic gaps, and a linear gravity-based self-recentering mechanism to prevent permanent bearing displacement without causing vertical fluctuation of the isolated structure. A previously developed multifeature SAP2000 model of the RNC isolator is improved in this paper to account for the inherent buffer mechanism's damping. Then, the effectiveness of the isolator's buffer mechanism in limiting peak bearing displacements is studied together with its possibly arising negative influence on the isolation efficiency. After that, the study investigates how to alleviate or even eliminate those possibly arising drawbacks, due to the developed RNC isolator's inner pounding as a result of its buffer activation, to achieve efficient seismic isolation with no direct structure-to-structure pounding, considering limited seismic gaps with adjacent structures and near-fault earthquakes. The results show that the RNC isolator could be an efficient solution for aseismic design in near-fault zones considering limited seismic gaps. Earthquake Engineering and Structural Dynamics. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：在严重的近断层地震下，研究了一种新近提出的地震隔离系统（具有固有的自停机制）缓解或消除相邻结构的地震震荡的能力。该隔离系统称为笼式滚动隔离器（RNC）。它是一种基于滚动的隔离器，可在一个单元中提供垂直刚性支撑，水平柔韧性以及增强的稳定性，滞后能量耗散以及对较小振动载荷的抵抗等必要功能。此外，RNC隔离器的特点是具有自停（缓冲）机制，可在比设计地震强的激励条件下或在有限的地震缝隙下限制轴承位移，并具有基于重力的线性自定心机制，可防止轴承永久位移不会引起隔离结构的垂直波动。本文改进了先前开发的RNC隔离器的多功能SAP2000模型，以解决固有缓冲机制的阻尼问题。然后，研究了隔离器的缓冲机制在限制峰值轴承位移方面的有效性，以及它可能对隔离效率产生的负面影响。之后，研究人员研究了如何缓解甚至消除那些可能出现的弊端，这是由于开发的RNC隔离器由于其缓冲器激活而产生的内部冲击，从而实现了有效的地震隔离，而没有考虑到有限的结构间直接冲击邻近结构的地震缝隙和近断层地震。结果表明，考虑到有限的地震缝隙，RNC隔离器可以作为近断层区域抗震设计的有效解决方案。地震工程与结构动力学。版权所有（c）2014 John Wiley＆Sons，Ltd.

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