Low-cut Filter Frequency Quantification and Its Influence on Inelastic Response Spectrum

ABSTRACT

The dependence of displacement on the low-cut frequency suggests that the low-frequency noise is responsible for the drift. Although the cause of the noise is unknown, at least one case is certain that the low-cut frequency should ensure the displacement drift within a reasonable range. To obtain the low-cut frequency, this paper proposes an adaptive method to quantify the threshold for newly-proposed parameters regarding the displacement. Low-cut frequencies determined by this study and those derived using traditional methods are compared. Their divergence on the inelastic spectra is studied by wavelet package decomposition which verifies the validity of the low-cut frequency.

KEYWORDS:

• Low-cut frequency
• low-frequency noise
• displacement drift
• inelastic spectra
• wavelet package decomposition

Acknowledgments

We also appreciate the support of the Major Program of Mutual Foundation of Weihai City with Harbin Institute of Technology (Weihai) and Taishan scholar project in Shandong province.

Data and Resources

The ground motions selected from the 2008 Wenchuan earthquake were provided by http://ngawest2.berkeley.edu/ (last accessed Dec 2018).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [51678208]; Natural Science Foundation of Shandong Province [ZR2018BEE044]; National Key R&D Program of China [2017YFC1500602; Local science and technology development foundation [YDZX20203700001129].