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Limit height-to-width aspect ratios for slender base isolated objects of heritage architecture

机译：限制遗产建筑的细长基础隔离对象的高宽比

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Seismic isolation has become a realistic alternative for decreasing the seismic vulnerability of heritage architecture. This article deals with a special technical aspect of base isolation design of slender rigid objects on elastomeric isolators, by considering the condition that the isolators cannot bear any tensile forces under simultaneous horizontal and vertical ground excitations. The main parameters that govern the response in this case are a) mass, mass position and height-to-width aspect ratios of the superstructure, b) stiffness, damping and plan arrangement of the isolators and c) expected horizontal as well as vertical earthquake acceleration components and their interconnections. The limit height-to-width aspect ratios were obtained for horizontal and vertical accelerations from the Eurocode 8 response spectra, as well as from dynamic analyses of seven near-fault ground motion records. The results are presented as maximum allowable aspect ratios for different vibration periods, ground conditions and design ground accelerations. The inclusion of vertical accelerations in governing equations is extremely important because different horizontal and vertical seismic loading combinations might significantly influence the maximum allowable height-to-width aspect ratios. The article concludes that the results from the response spectrum analysis are conservative. Although, in some ground motion records, the critical combination of horizontal and vertical response accelerations can also produce smaller limit height-to-width aspect ratios.
机译：地震隔离已成为降低传统建筑的地震脆弱性的现实选择。本文考虑了在水平和垂直地面同时激励下，隔振器不能承受任何拉力的条件，研究了弹性隔振器上细长刚性物体的基础隔震设计的特殊技术方面。在这种情况下，决定响应的主要参数是：a）质量，上部结构的质量位置和高度与宽度的长宽比，b）隔离器的刚度，阻尼和平面布置，以及c）预期的水平和垂直地震加速组件及其互连。从Eurocode 8响应谱以及七个近断层地面运动记录的动态分析获得了水平和垂直加速度的极限高宽比。结果以不同振动周期，地面条件和设计地面加速度的最大允许纵横比表示。在控制方程中包括垂直加速度非常重要，因为不同的水平和垂直地震荷载组合可能会显着影响最大允许的高宽纵横比。文章得出的结论是，响应谱分析的结果是保守的。尽管在某些地面运动记录中，水平和垂直响应加速度的关键组合也可以产生较小的极限高宽比。

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