Experimental Study on Influence of Hardening of Isolator in Multiple Isolation Building
Experimental Study on Influence of Hardening of Isolator in Multiple Isolation Building
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DOI：
10.3389/fbuil.2016.00012
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发表时间：
2016-06
影响因子：
3
通讯作者：
K. Fujita;Toshiya Miura;M. Tsuji;I. Takewaki
中科院分区：
文献类型：
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作者：
K. Fujita;Toshiya Miura;M. Tsuji;I. Takewaki
提出了一种新型的多重隔震结构体系，并通过缩尺结构模型振动台试验研究了隔震器硬化对多重隔震结构响应的影响。以2011年日本东北太平洋地震为例，通过对近年来发生的远断层地震灾害的观测，提出了长周期、长持续地面激励可能对既有隔震建筑造成严重破坏的问题。为了提高这些建筑物的地震振动抑制性能，近年来，多重隔震结构作为一种创新的解决方案被开发出来。多重隔震结构是指在基础的基础上增加附加隔震层，形成多层隔震结构的隔震结构。本文通过缩尺模型的振动试验，研究了在极强远场地震作用下，作为最坏情况的多重隔震系统的优点。在比例模型中，通过几何非线性提供了非线性阻尼力特性（硬化），该几何非线性可以通过在垂直于振动方向的方向上插入线性弹簧来实现。通过与无硬化效应的同一模型的响应进行比较，研究了硬化效应对结构响应的影响。在与基础隔震结构的比较中，利用可控紧凑型振动台，通过稳态正弦波扫频，从多重隔震系统和基础隔震系统对基础输入的传递函数两个方面，评价了基础隔震结构的基本地震振动抑制性能。在数值模拟中，还研究了隔震层中摩擦力的影响。
An innovative multiple isolation building system is proposed and the influence of hardening in seismic isolators on the response of a multiple isolation building is investigated by shaking table vibration tests for a scaled structural model. From the observation in recent earthquake disasters in far-fault ground motions, e.g. the 2011 off the Pacific coast of Tohoku earthquake, a significant concern is reminded that the long-period and long-duration ground excitation may cause severe damages to the existing base-isolated buildings. In order to enhance the seismic vibration suppression performance of those buildings, the multiple isolation structure has been developed recently as one of the innovative solutions. The multiple isolation structure is defined as a seismic isolated building which has multiple isolation stories by inserting supplemental isolators in the middle story in addition to the base. In this paper, the advantages of the proposed multiple isolation system subjected to an extremely strong far-field earthquake ground motion as the worst scenario are studied by the vibration test for a scaled model. In the scaled model, a non-linear restoring-force characteristic (hardening) is provided by the geometrical non-linearity which can be realized by inserting linear springs in the direction perpendicular to the vibration direction. The influence of this hardening property on the structural responses is studied by comparing with the responses of the same model without hardening effect. In the comparison with the base-isolated building, the fundamental seismic vibration suppression performances are evaluated in terms of the transfer functions of both a multiple isolation system and a base isolation system to the base input by sweeping frequencies of stationary sine waves using a controllable compact shaking table. In the numerical simulations, the effect of the friction in the isolation layers is also investigated.