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Torsional balance of seismically isolated asymmetric structures

机译：隔震非对称结构的扭转平衡

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摘要

Seismic isolation systems reduce the destructive effects of earthquakes through introducing a flexible interface between the superstructure and the foundation. Numerous studies, both analytical and experimental, have shown that such devices can control the translational response of the superstructure. However, no generally consistent design recommendations to control the torsional response are available. The objective of this paper is to present a methodology that lead to achieve optimal torsional control. The assumption behind is that the isolation-superstructure system can be split into an isolated base and superstructure subjected to the filtered ground motion excitation produced by the base response. The superstructure acts as a rigid body subjected this filtered acceleration responses which are applied as quasi-static inputs into the superstructure. Under rather weak assumptions, this simplification provides excellent results in estimating the response of the system. Such response has been used in this study to choose the optimal eccentricity and torsional stiffness parameters of the isolation system that minimize the lateral-torsional response of the superstructure. Results are obtained using probabilistic techniques and show that the response of the superstructure may be substantially improved if the isolation system is torsionally flexible, and if the center of stiffness of the isolated base should lie in the vicinity of the (average) center of stiffness of the superstructure.
机译：隔震系统通过在上层建筑和地基之间引入灵活的接口来减少地震的破坏作用。大量的分析和实验研究均表明，此类装置可以控制上部结构的平移响应。但是，目前尚没有控制扭转响应的一般一致的设计建议。本文的目的是提出一种能够实现最佳扭转控制的方法。后面的假设是，隔离上部结构系统可以分为隔离的基础和上部结构，这些基础受基础响应所产生的滤波后的地震动激励。上层建筑作为刚体，受到此滤波后的加速度响应，并作为准静态输入应用于上层建筑。在相当弱的假设下，这种简化在估计系统响应方面提供了出色的结果。在本研究中已使用这种响应来选择隔离系统的最佳偏心率和扭转刚度参数，以使上部结构的横向扭转响应最小化。使用概率技术获得的结果表明，如果隔离系统具有扭转挠性，并且如果隔离基座的刚度中心应位于（平均）刚度中心附近，则上部结构的响应可能会得到显着改善。上层建筑。

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  • 来源
    《Engineering Structures》 |2013年第1期|703-717|共15页
  • 作者

    Carlos E. Seguin; Jose L. Almazan; Juan C. De la Llera;

  • 作者单位

    Department of Structural and Ceotechnical Engineering, Pontificia Universidad Catolica de Chile, Vicuna Mackenna 4860, Santiago, Chile;

    Department of Structural and Ceotechnical Engineering, Pontificia Universidad Catolica de Chile, Vicuna Mackenna 4860, Santiago, Chile;

    Department of Structural and Ceotechnical Engineering, Pontificia Universidad Catolica de Chile, Vicuna Mackenna 4860, Santiago, Chile;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    seismic isolation; torsional balance; structural optimization; superstructure protection;

    机译：地震隔离扭转平衡结构优化;上层建筑保护;

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