Seismic tests and analysis of HTR graphite single column model

Consisting of graphite bricks mainly, the HTR core structure exhibits a complex dynamic behavior in the seismic load. Graphite single column model is set up based on the design of the HTR-PM to conduct the shake table tests in different boundary conditions. White noise wave and swept sine wave are used for the dynamic characteristic exploration tests and artificial seismic wave for functional verification tests. The acceleration data of the model is obtained. Further, the first natural frequency, damping coefficient, acceleration amplification factors and displacements are obtained on the basis of acceleration analysis. The result shows that the graphite single column model is with an obvious non-line performance. In a free state, its first natural frequency is between 1 and 5 Hz. The relative displacements between most adjacent bricks are below 5 mm, which meets the requirements. (authors)