Nuclear containment is the last barrier to prevent the leakage of nuclear fission products.It belongs to Class Ⅰ earthquake-resistant items.However,in recent years,the seismic performance of the containment is worthy of attention due to the frequent occurrence of super-design basis earthquakes represented by the Fukushima earthquake in Japan.The base isolation can effectively reduce the seismic response of the structure.The friction pendulum isolation bearing has been widely used in bridge and building construction because of its excellent isolation performance,but there is no application case of nuclear containment.In this paper,based on software ANSYS,the overall models of non-isolation and isolation containment structure with friction pendulum bearings are established.The frequency,displacement,acceleration and shear force of nuclear containment structure are compared and analyzed by inputting the same ground motions,so as to study the feasibility of application of friction pendulum bearings in nuclear containment structures.The analysis results show that the natural period of isolated structures is significantly increased compared to non-isolated structures,and the indicators of inter story relative displacement,acceleration,and shear force of isolated structures are smaller than those of non-isolated structures.This further indicates that isolated bearings are beneficial for improving the seismic performance of nuclear safety shells.
关键词
核安全壳/摩擦摆支座/基础隔震/时程分析
Key words
nuclear containment/friction pendulum bearing/base isolation/time history analysis
维普
万方数据