Nuclear structure-interface-soil interaction model in consideration of uplift-slip effects

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (6) : 126-133.

HU Zhewen1,2，LI Jianbo1,2，LI Zhiyuan1,2

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Abstract

Under strong earthquake, the possible uplift-slip of the nuclear island common raft has a significant impact on the structural stress state. Refined simulation of the contact state on raft-soil interface and analyzing structure-interface-soil as a whole, are helpful to clarify the influence mechanism of uplift-slip effects on the seismic response of the structure. By applying the contact model named the penalty function method to simulate the contact mechanical behavior between the raft and the soil, the equivalent linear method for describing dynamic nonlinearity of the soil, and the viscoelastic boundary method for simulating radiation damping condition, a structure-interface-soil interaction model in consideration of uplift-slip effects was established. Furthermore, by applying the proposed model to evaluate the response of AP1000 nuclear island plant, the comparison of the simplified model of the raft-soil binding was achieved in consideration of the combined static and dynamic effects. The results showed that the peak of the structure acceleration response and the peak and the shape of the floor response spectrum changed obviously, which indicated that under strong earthquake uplift-slip of the raft had an adverse effect on the anti-seismic safety. It can be seen that uplift-slip effects should be considered in the seismic fortification of nuclear power structures.

Key words

uplift-slip / contact algorithm / nuclear power structure / soil-structure interaction / strong earthquake

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HU Zhewen1,2，LI Jianbo1,2，LI Zhiyuan1,2. Nuclear structure-interface-soil interaction model in consideration of uplift-slip effects[J]. Journal of Vibration and Shock, 2023, 42(6): 126-133

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