Study on Nonlinear Response Spectra for Base-Isolated Structures Considered Non-proportional Damping

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (17) : 207-212.

Du Yongfeng1,2, Xu Tianni2, Bao Chao2, Chen Kai2, Hong Na2

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Abstract

The damping characteristics of upper structure and the isolation layer of base-isolated system are completely different, so the system often exhibits significant non-proportional damping characteristics. It is necessary to consider the non-proportional damping during seismic design of base-isolated structure; meanwhile this design method is convenient for promotion and application. The two degrees of freedom simplified model for the base-isolated structures is set up，and the non-proportional damping effect is thought over when establishing the motion equation Then the simplified model are analyzed and simultaneously obtained its response spectra which considered non-proportional damping and Rayleigh damping under the near-field and far-field ground motions, and get the calculation formula of the ratio between two response spectra and period by nonlinear curve fitting. Finally, the seismic response analysis for a real base-isolated structure is done, and verifies the reasonableness of the proposed formula.

Key words

non-proportional damping / response spectra / near-filed and far-filed ground motions / base-isolated structure

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Du Yongfeng1,2, Xu Tianni2, Bao Chao2, Chen Kai2, Hong Na2. Study on Nonlinear Response Spectra for Base-Isolated Structures Considered Non-proportional Damping[J]. Journal of Vibration and Shock, 2016, 35(17): 207-212

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