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Analysis of the rocking response of rigid blocks standing free on a seismically isolated base

机译：在地震隔离的基础上自由站立的刚性砌块的摇摆响应分析

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This paper examines the rocking response and stability of rigid blocks standing free on an isolated base supported: (a) on linear viscoelastic bearings, (b) on single concave and (c) on double concave spherical sliding bearings. The investigation concludes that seismic isolation is beneficial to improve the stability only of small blocks. This happens because while seismic isolation increase the 'static' value of the minimum overturning acceleration, this value remains nearly constant as we move to larger blocks or higher frequency pulses; therefore, seismic isolation removes appreciably from the dynamics of rocking blocks the beneficial property of increasing stability as their size increases or as the excitation pulse period decreases. This remarkable result suggests that free- standing ancient classical columns exhibit superior stability as they are built (standing free on a rigid foundation) rather than if they were seismically isolated even with isolation system with long isolation periods. The study further confirms this finding by examining the seismic response of the columns from the peristyle of two ancient Greek temples when subjected to historic records.
机译：本文研究了在独立基座上自由站立的刚性块的摇摆响应和稳定性：（a）在线性粘弹性轴承上，（b）在单凹形上，（c）在双凹面球形滑动轴承上。研究得出的结论是，地震隔离仅有助于提高小块体的稳定性。发生这种情况的原因是，尽管地震隔离增加了最小倾覆加速度的“静态”值，但当我们移至更大的块或更高频率的脉冲时，该值几乎保持不变；因此，地震隔离可以从摇摆块的动力学中明显地消除其稳定性的有益特性，因为其尺寸增大或激励脉冲周期减小。这一非凡的结果表明，独立式古代古典柱子在建造时（在刚性基础上自由站立）表现出卓越的稳定性，而不是即使隔震周期长的隔震系统也能进行地震隔离。这项研究通过检查两座古希腊神庙的围墙柱的地震反应，进一步证实了这一发现。

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