This research evaluates the effectiveness of using a roller-type base isolation device with tensile strength in reducing the dynamic response of industrial steel storage racks. These were subjected to a seismic input acting separately in both directions of the structure. The seismic record obtained from the earthquake that occurred in Llolleo, Chile, on 3 March 1985, was used as input. This earthquake was scaled in the frequency domain, adjusting its response spectrum to coincide with the design spectrum required by NCh2745. In the calculations of this spectrum, the most hazardous seismic zone (zone 3) and soft soil (soil III) that amplifies the effect of the low frequencies of the earthquake were considered. These frequencies are the ones that have the most affect on flexible structures such as high racks and systems with base isolation. Numerical time-history analyses were performed in fixed base racks and base isolation racks. In both cases, the models include semi-rigid connections with capacity for plastic deformation and energy dissipation. Parametric analyses were carried out considering the most relevant variables, using an algorithm programmed in MATLAB software. The maximum relative displacement, maximum basal shear load, and maximum absolute floor acceleration were considered as responses of interest. The results showed the effectiveness of using the base isolation device by reducing the absolute accelerations between approximately 75% and 90%, compared to the same fixed rack at its base. This makes it possible to reduce the vulnerability of the stored load to overturn under the action of a severe earthquake.

中文翻译：

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带滚轮式隔震器的钢制储物架地震响应的数值研究

这项研究评估了使用具有抗拉强度的辊式基础隔离装置在降低工业钢制储物架动态响应方面的有效性。这些受到地震输入，分别在结构的两个方向上作用。从1985年3月3日在智利Llolleo发生的地震中获得的地震记录被用作输入。地震在频域中缩放，调整其响应谱以与NCh2745所需的设计谱一致。在此频谱的计算中，考虑了会放大地震低频影响的最危险的地震带（3区）和软土（III区）。这些频率是对柔性结构（例如高机架和带有基础隔离的系统）影响最大的频率。在固定基础机架和基础隔离机架中进行了数值时间历史分析。在这两种情况下，模型都包含半刚性连接，具有塑性变形和能量消散的能力。考虑到最相关的变量，使用MATLAB软件中编程的算法进行了参数分析。最大相对位移，最大基础剪力和最大绝对地面加速度被视为关注的响应。结果表明，与相同的固定机架底座相比，通过将绝对加速度降低大约75％至90％，可以使用基本隔离装置。这使得可以减小在剧烈地震作用下所存储的负载倾覆的脆弱性。