Evaluation of damping modification factor for high-damping design response spectra

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (8) : 209-217.

LU Hao1,2

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Abstract

The accuracy of five kinds of formulations were assessed by comparing exact and approximate response spectra for three different damping levels,namely 10%,20% and 30%,respectively.The comparison was referred to 120 ground motion records matched with Class II site condition.The most simple and straightforward solution to get the displacement spectra was to convert the acceleration spectra from seismic design codes using pseudo-spectral relationship,which was correct only for systems without damping,as well as sine and cosine relationship could be neglected.Consequently,it was necessary to evaluate separately for high-damping acceleration response spectra and high-damping displacement response spectra.The results show that the damping modification factors proposed by Lin & Chang is suitable for developing high-damping displacement response spectra,and the damping modification factors proposed by China code for seismic design of buildings is suitable for developing high-damping acceleration response spectra.

Key words

elastic response spectra / damping modification factor (DMF) / viscous damping ratio / class II site / natural earthquakes

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LU Hao1,2. Evaluation of damping modification factor for high-damping design response spectra[J]. Journal of Vibration and Shock, 2017, 36(8): 209-217

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