A double shell space damping structure is introduced to reduce the vertical accelerations of the containment in the nuclear power plant.Based on the mechanical characteristics of the structure,a simplified three particle and three degree of freedom dynamic model is established,the structural response transfer functions are further given and the parameter analysis was conducted.The influence rules of the structural mass ratios,damping ratios and frequency ratios on the vertical response of the structure are clarified.The scale shaking table dynamic test of the double shell space damping structure is completed.The test results show that the double shell space damping structure can reduce the vertical accelerations of the inner containment,and the damping ratios are 12.23%～27.84%.The theoretical calculation results are in good agreement with the experimental results.The double shell space damping structure can effectively reduce the vertical acceleration response of the containment in the nuclear power plant.
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