Research On Seismic Isolation Damper Simulation Of Nuclear Polar Crane

Circular crane of nuclear power station(nuclear polar crane),is one of the most important equipment of nuclear power station.During the construction phase of the nuclear power station,the nuclear polar crane will hoist various equipment to assist in the construction of nuclear power stations.After the completion of nuclear power stations,nuclear polar cranes are mainly responsible for the hoisting tasks during the refueling,inspection and maintenance of nuclear power stations.The safety of nuclear polar crane in extreme conditions(such as earthquakes)is critical to ensuring the safety and production of nuclear power station.Thus,nuclear polar cranes are required to have good seismic resistance performance.So far,relevant researches have focused on the performance analysis of nuclear polar cranes under earthquake conditions,and with the development of nuclear power technology,the requirements for nuclear polar cranes have also been continuously improved.The traditional nuclear polar crane design methods have been difficult to meet the seismic resistance requirements.It is imperative to improve the seismic resistance performance of nuclear polar cranes by seismic isolation damping technology.However,there is little research on the seismic isolation damping of nuclear polar cranes.And it is necessary to analyze the mechanism of seismic isolation and the corresponding seismic performance of nuclear polar cranes,as well as the design method of the seismic isolation damper should be systematically studied.In this paper,the finite element simulation analysis method is used to analyze the seismic resistance performance of the nuclear polar crane of original design model,and the calculation results include acceleration response,displacement response and force response is obtained.The rubber isolation damper is designed.Then the general finite element software ABAQUS was used to establish the overall model of the nuclear polar crane with isolation damper.The seismic resistance performance of the rubber isolation damper was obtained through simulation,and the optimal parameters were obtained by comparing the calculation results of different rubber parameters.The effects of different rubber thickness on the seismic resistance performance was also analyzed.The main work of this paper includes:(1)The finite element model of the original design of the nuclear polar crane is established,and the boundary conditions are set,the seismic curve is selected and the Rayleigh damping is obtained;(2)The dynamic time-history analysis of the original nuclear polar crane is carried out,and the acceleration response,displacement response and horizontal device axial force of the original designed isolation device are obtained;(3)Analyzed the types of existing seismic isolation devices and the characteristics of rubber materials,then the rubber constitutive model is selected;(4)The rubber seismic isolation damper is designed,and the effectiveness of the trigger mechanism of the designed isolation device is verified through ADAMS simulation;(5)Seismic time history analysis of the nuclear polar crane with rubber isolation damper,and comparing the damping effect,analyzing the relative displacement of wheel and track and the validity of relation between wheel and track is verified;(6)Comparing the damping effect of the rubber isolation damper under different rubber parameters,and analyzing the influence of geometric parameters on the damping performance;(7)The design method of the seismic isolation damping device and the selection method of the rubber isolation damper parameters are proposed.The results show that the new seismic isolation damping device can effectively reduce the seismic response of the nuclear polar crane under the premise of ensuring the normal working performance of the nuclear polar crane.The maximum comprehensive acceleration response of the structure is reduced by 22.7%.The research results provide a meaningful reference for the design of seismic isolation damping.