Static-dynamic Response Analysis of Upright Wing Wall and Drainage Immersed Tube Cross System of NPP Considering SSI Effect

The upright wing walls on both sides of the joint pump house and the drainage immersed tube of a nuclear power plant are crossed design and belong to the seismic class I items, therefore, considering that the soil-crossing system structural dynamic interaction is a key technical issue for seismic safety evaluation. Based on the actual nuclear power plant site conditions, the ANSYS analysis platform is used to establis h a hydrostatic analysis model of the wing wall-immersed tube crossover system-foundation, through the viscoelastic boundary units created by running UPFs to consider the influence of infinite foundation radiation damping and the input of ground vibration, and refine the simulation of the mechanical properties of the foundation materials and the spatial distribution pattern of the crossover system. The response analysis of the crossed wing wall-immersed tube system was carried out to investigate the changes of stress, deformation and acceleration peak of the crossed system. The calculation results show that the stress concentration phenomenon occurs at the intersection of the upright wing wall and the drainage immersed tube, and the vertical acceleration response of the wing wall structure had a great change from the vertical and horizontal displacement deformation of the drainage immersed tube, and the response of the immersed tube in the intersection had also increased significantly. The research results can provide technical reference for the design of similar crossover systems for nuclear power plant water intake engineering structures.