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Damping modification factors for SDOF systems subjected to near-fault, far-fault and artificial earthquakes

机译：SDOF系统在近断层，远断层和人为地震中的阻尼修正因子

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摘要

Damping modification factors (DMF) are used in modern seismic codes to adjust elastic response spectral values corresponding to 5% of viscous damping to other higher or lower damping levels. This paper presents a simple and effective procedure to estimate DMF for single-degree-of-freedom systems. Empirical expressions are proposed for displacement, velocity and acceleration response spectra, where four types of soil conditions, from hard rock to soft soil are considered. This study also examines, for the first time, the influence of artificial earthquakes on DMF. Furthermore, natural near-fault and far-fault seismic ground motions are considered where it is testified that the fault distance has no impact on DMF. Finally, it confirms that, in contrast to the considerations of many seismic codes, DMF are strongly dependent on the period of structural vibration while there are significant problems of using the same modification factor to estimate maximum displacement, velocity and seismic forces.
机译：在现代地震规范中，阻尼修正系数（DMF）用于将对应于5％粘性阻尼的弹性响应谱值调整为其他更高或更低的阻尼水平。本文提出了一种简单有效的方法来估计单自由度系统的DMF。提出了位移，速度和加速度响应谱的经验表达式，其中考虑了从硬岩到软土的四种土壤条件。这项研究还首次检验了人工地震对DMF的影响。此外，在证明断层距离对DMF没有影响的情况下，考虑了自然的近断层和远断层地震地震动。最后，它证实，与许多地震法则相比，DMF强烈依赖于结构振动的周期，而使用相同的修正因子来估算最大位移，速度和地震力存在重大问题。

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