Large Deformation Hardening Model for Leading Rubber Bearings and Elastic-plastic Analysis on Isolation Structure

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (15) : 90-97.

WU Qianyun1, HE Wenfu1 , LIU Wenguang1 , QIN Chuan1

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Abstract

Having large deformation horizontal shear experiment on the LRB600 and LRB1100 which the shear deformation is 400%, it shows that the stiffness of bearings becomes greater when the shear deformation is 240%, the hardening stiffness increases with the increase of shear deformation, and it has a 1.5-fold increased when shear deformation is 400%. According to the test results, a new multi linear model which considers the hardening effect is proposed and used in Perform-3D. The elastic-plastic analysis is carried out on the structure in different earthquake intensity, the leading rubber bearings adopt traditional bilinear model and multiple linear hardening model respectively to comparing the seismic response, elastic-plastic response spectrum and the plastic energy dissipation of the structure, verifying the adverse influence of the bearings hardening. Analysis indicates that the hardening of bearings could weaken the isolation effect in major earthquake, the acceleration of upper structure increases by 30%~50%, and the plastic energy dissipation of the structure goes higher, the upper structure enter into the plastic deformation condition. Research result show that the seismic response of the structure can be underestimated without considering the effect of bearings hardening in isolation design.

Key words

bearing hardening / seismic response / response spectrum / energy;

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WU Qianyun1, HE Wenfu1,LIU Wenguang1,QIN Chuan1. Large Deformation Hardening Model for Leading Rubber Bearings and Elastic-plastic Analysis on Isolation Structure[J]. Journal of Vibration and Shock, 2017, 36(15): 90-97

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