Experimental research on seismic responses of a new type of nuclear power plant under different site conditions

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (18) : 214-222.

GAO Yongwu1,2, WANG Tao1,2, DAI Junwu2 ,JIN Bo2

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Abstract

It is important to consider the soil-structure interaction to accurately simulate the seismic responses of the structures, subsidiary systems and components of nuclear power plants. This paper presents a set of shaking table tests on a 1:25 scaled nuclear power plant structure, with the underlying soil simulated using a multi-functional laminated shear container by which the viscous-elastic boundary is well reproduced. A group of 10 ground motion records are input through the shaking table. The PGAs are scaled to the operational basis earthquake (OBE 0.15g), the safely shutdown earthquake (SSE 0.30g), and the ultimate earthquake beyond the design basis standard (ULE 0.75g). The test result indicates that the plasticization is gradually developed in the soil with the increasing input intensity. The soil nonlinearity exerts significant influence on the responses of the superstructure. The soil significantly amplifies the structural dynamic responses, although it is in a bedrock type site. The amplification factor is 3.13, 2.1, and 1.19 for the OBE, SSE, and ULE, respectively. It decreases with the input seismic intensity, because the underlying soil enters plastification. Therefore, it is suggested that the condition of bedrock site needs further evaluation, and at any type of site, the soil-structure interaction shall be considered, particularly for the seismic design and seismic margin analysis of facilities and pipes inside a nuclear power plant. Otherwise, the seismic margin will be underestimated.

Key words

soil-structure interaction / nuclear power plant / shaking table test / seismic intensity / floor response acceleration

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GAO Yongwu1,2, WANG Tao1,2, DAI Junwu2,JIN Bo2. Experimental research on seismic responses of a new type of nuclear power plant under different site conditions[J]. Journal of Vibration and Shock, 2017, 36(18): 214-222

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