Stochastic-based damping reduction factors
Stochastic-based damping reduction factors
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DOI：
10.1016/j.soildyn.2015.09.014
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发表时间：
2016
影响因子：
4
通讯作者：
M. Palermo;S. Silvestri;T. Trombetti
中科院分区：
文献类型：
--
作者：
M. Palermo;S. Silvestri;T. Trombetti
在科学文献和抗震规范中，用于高阻尼结构抗震设计的阻尼折减系数的大多数实际公式都是通过对单自由度体系在地震加速度记录下的时程响应进行统计分析而得出的。在这项研究中，解析公式的基础上的功率谱密度函数的阻尼降低因子推导和比较，在科学文献中的主要公式。地表地面运动模拟与金井-Tajimi功率谱密度，即作为一个“理想的白色噪声”在基岩过滤通过土壤存款。据发现，地面卓越周期和结构的基本周期之间的比率显着影响减少由于高阻尼，在某些情况下（如刚性低层建筑物），实际的代码配方可能会变得不保守。最后，简单的代码类公式估计的阻尼折减系数占之间的比率地面卓越周期和结构的基本周期。
Most of the actual formulas available in both scientific literature and seismic codes for the damping reduction factors to be used for the seismic design of highly damped structures are derived through statistical analyses of the time-history response of SDOF systems subjected to earthquake accelerograms. In this study, analytical formulations of the damping reduction factor based on power spectral density functions are derived and compared with the main formulas available in the scientific literature. The surface ground motion is modelled with the Kanai–Tajimi power spectral density, i.e. as an “ideal white noise” at the bedrock filtered through the soil deposit. It is found that the ratio between the ground predominant period and the structure fundamental period significantly influences the reduction due to high damping and that, in some cases (e.g. stiff low-rise buildings), the actual code formulations may become unconservative. Finally, simple code-like formulas for the estimation of the damping reduction factor accounting for the ratio between the ground predominant period and the structure fundamental period are proposed.