Seismic responses of a nuclear plant isolated structure supported by rubber bearings with a multi-factor coupled mechanical model

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (17) : 72-78.

HE Wenfu,HUANG Yishen,LIU Wenguang,LIU Wenyan

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Abstract

Aiming at rubber bearing mechanical performances’coupling features related to horizontal loading,horizontal deformation and vertical loading,tests for relevance between horizontal and vertical performances of rubber bearings were conducted. Here,considering rubber supporting bearings with a multi-factor coupled mechanical model,the dynamic responses of a nuclear plant isolated structure under 12 waves with different shear wave velocities were simulated and analyzed. The theoretical analysis results agreed well with those of tests. The simulation results showed that the vertical stiffness decay of AP1000 is larger than its horizontal stiffness decay; different earthquakes with different shear wave velocities have large influences on the dynamic responses of the nuclear plant isolation structure,the smaller the shear wave velocity,the larger the stiffness decay rate in both directions; the displacement response of the super-structure of the isolated structure supported by rubber bearings with the coupled model is significantly larger than that supported by bearings without the coupled model; under earthquake beyond design basis,the isolated structure’s displacement response and stiffness decay rate have abrupt changes,bearings with the coupled model enter a buckling failure stage and the superstructure enters sudden collapse; therefore,under earthquake beyond design basis,if a nuclear plant isolated structure’s dynamic responses are computed not using rubber bearings with the multi-factor coupled mechanical model,its seismic responses can be under-estimated.

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HE Wenfu,HUANG Yishen,LIU Wenguang,LIU Wenyan. Seismic responses of a nuclear plant isolated structure supported by rubber bearings with a multi-factor coupled mechanical model[J]. Journal of Vibration and Shock, 2018, 37(17): 72-78

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