Correlation between ground motion intensity indexes and displacement responses of a base-isolated structure under pulse-type ground motions

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (10) : 262-268.

WANG Yanan1, YU Jiao1, DU Yongfeng2

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Abstract

Here,a single-DOF (SDOF) system equivalent to a based-isolated structure system was taken as the study object,Bouc-Wen model was used to describe the system nonlinear force-deformation behavior,near fault pulse-type ground motion records were taken as input,and nonlinear seismic responses of the system were computed using the software MATLAB.Spearman rank correlation coefficient method was used to statistically study the relevance between ground motion intensity indexes and seismic displacement responses of the SDOF system.A 5-floor base-isolated structure and a 8-floor one were taken as examples to verify the analysis results, respectively.The study results showed that compared with other types of ground motion intensity indexes, velocity-type ones have a higher relevance to the equivalent SDOF system’s seismic displacement responses within each period;correlation coefficient curves corresponding to various ground motion intensity indexes have obvious classification features, and the ground motion intensity index corresponding to the 1st type curve is more suitable for multi-story base-isolated structures, VSI or HI is recommended as an optimal index to be used inpredicting seismic displacement responses of multi-story base-isolated structures.

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ground motion intensity indexes / pulse-type ground motions / base-isolated structure / correlation coefficient

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WANG Yanan1, YU Jiao1, DU Yongfeng2. Correlation between ground motion intensity indexes and displacement responses of a base-isolated structure under pulse-type ground motions[J]. Journal of Vibration and Shock, 2019, 38(10): 262-268

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