Theoretical analysis of bearings in tension and shaking table tests on a base-isolated nuclear power plant structure

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 153-160.

LIU Wenguang1CHENG Ying1LI Shaoping2YANG Jie2 HE Wenfu1

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Abstract

The motion equation of a base-isolated nuclear power plant structure in consideration of uplift and rocking effects was established.The formula for the bound of earthquake input when the bearings were in tension was obtained.The effect of high-width ratio and isolation period on the peak bound was analyzed.Shaking table tests and numerical simulations on the base-isolated nuclear power plant structure were conducted with a 1/10 scale model under one-way, two-way and three-way earthquake input.The analysis results show that the seismic isolation technology can effectively reduce the seismic response of the upper structure.The horizontal peak accelerations of the upperstructure are less than those of the table under one-way and two-way earthquake input.The peak accelerations in the horizontal response spectrum move toward low frequency.The phenomenon of rubber bearings in tension can be observed when the earthquake input is beyond the designed one.The bound of earthquake input obtained by the analysis was compared with the results of model tests and numerical simulations, and it is found they are in good agreement.

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nuclear power plant / tension of bearing / shaking table test / seismic response

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LIU Wenguang1CHENG Ying1LI Shaoping2YANG Jie2 HE Wenfu1. Theoretical analysis of bearings in tension and shaking table tests on a base-isolated nuclear power plant structure[J]. Journal of Vibration and Shock, 2019, 38(14): 153-160

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