Constant-strength displacement demand spectra of base-isolated structures under pulse-like ground motions

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (1) : 85-89.

Wang Ya-nan1, Du Yong-feng2, Hu Gao-xing1

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Abstract

An isolation bearing would experience large deformation under pulse-like ground motions, and this may cause isolation bearing’s cracking or instability. Using constant-strength displacement demand spectra to evaluate the maximum inelastic deformation of the isolation bearing is a very simple and effective method. The constant-strength displacement demand spectra of base-isolated structures were studied taking near-fault pulse-like ground motions as inputs. The nonlinear mechanical characteristics of the isolation bearing were represented by the Bouc-Wen model, and the relevant motion equations with respect to the constant-strength displacement demand spectra of base-isolated structures were established. The software MATLAB was used to solve these motion equations, and the constant-strength displacement demand spectra of base-isolated structures were obtained. At last, the constant-strength displacement demand spectra's mathematical expression was established by numerical fitting. This expression can be used to evaluate the isolation bearing's maximum inelastic deformation quickly, and is easy to be applied in engineering practice.

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pulse-like ground motions / base-isolated structure / constant-strength displacement demand spectra

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Wang Ya-nan1, Du Yong-feng2, Hu Gao-xing1. Constant-strength displacement demand spectra of base-isolated structures under pulse-like ground motions[J]. Journal of Vibration and Shock, 2018, 37(1): 85-89

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