Study on Nonlinear Response Spectra for Base-Isolated Structures Considered Non-proportional Damping
Du Yongfeng1,2, Xu Tianni2, Bao Chao2, Chen Kai2, Hong Na2
1. Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050;
2. Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050
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.
杜永峰1,2，徐天妮2，包超2，陈凯2，洪娜2. 考虑非比例阻尼的基础隔震结构非线性反应谱研究[J]. 振动与冲击, 2016, 35(17): 207-212.
Du Yongfeng1,2, Xu Tianni2, Bao Chao2, Chen Kai2, Hong Na2. Study on Nonlinear Response Spectra for Base-Isolated Structures Considered Non-proportional Damping. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(17): 207-212.
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