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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Reliability of U-shaped steel dampers used in base-isolated structures subjected to biaxial excitation
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Reliability of U-shaped steel dampers used in base-isolated structures subjected to biaxial excitation

机译：双轴激励下用于基础隔震结构的U型钢阻尼器的可靠性

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摘要

A reliable performance of anti-seismic devices when the upper-structure is subjected to strong biaxial seismic excitation is of vital importance to ensure the latter doesn't reach critical behavior. U-shaped steel dampers are hysteretic devices used to dissipate the earthquake-induced energy of base-isolated structures. In the framework of performance-based design, which is gaining more and more recognition, it is of particular importance to assess the performance of base-isolated structures with such dampers under different intensity levels of bidirectional ground motion. To achieve this goal, an analytical model able to simulate the bidirectional displacement response of an isolation system is adopted. Incremental dynamic analysis (IDA) is used to obtain the relation between the earthquake-induced bidirectional damage of U-shaped steel dampers and different intensity levels of the considered records. The performance of the dampers is categorized into 5 levels delimited by 4 limit states for which fragility curves are derived. The results obtained using the bidirectional approach are quantitatively compared to those given by employing an in-plane model (widely used in current design practices in Japan) with the purpose of assessing whether the latter provides unconservative estimates of the performance of the dampers. The main conclusion is that, for large seismic intensities, the safety margin against fracture of the dampers is significantly overestimated when an in-plane model is adopted. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：当上部结构受到强烈的双轴地震激励时，抗震设备的可靠性能对于确保后者不会达到临界性能至关重要。 U型钢阻尼器是一种滞后装置，用于消散地震引起的基础隔离结构的能量。在越来越受到认可的基于性能的设计框架中，特别重要的是评估在不同强度的双向地面运动情况下，具有这种减震器的基础隔震结构的性能。为了实现这一目标，采用了能够模拟隔离系统双向位移响应的分析模型。增量动力分析（IDA）用于获得地震引起的U型钢制阻尼器的双向损伤与所考虑记录的不同强度水平之间的关系。阻尼器的性能分为5个级别，这些级别由4个极限状态界定，并针对这些极限状态导出了脆性曲线。将使用双向方法获得的结果与采用平面模型（在日本目前的设计实践中广泛使用）给出的结果进行定量比较，以评估后者是否提供了减震器性能的非保守估计。主要结论是，对于大地震强度，采用面内模型时，阻尼器断裂的安全裕度被大大高估了。版权所有（c）2016 John Wiley＆Sons，Ltd.

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