核电站环形吊车抗震计算分析

Analysis of Seismic Response of a Polar Crane in Nuclear Power Plant

应用有限元分析软件ANSYS建立了核电站环形吊车结构的三维计算模型,在模态分析的基础上,以环形吊车所在的安全壳标高40.0 m处的地震反应谱作为输入,对环形吊车结构进行了地震响应分析计算。计算结果表明,地震动作用下环形吊车的垂直位移和应力响应比较小,但水平位移和应力响应比较大,原因是环形吊车水平方向1阶弯曲振动固有频率位于水平地震反应谱最大值频率区间附近;环形吊车结构在地震动作用下能满足抗震设计强度要求,应力集中处的最大应力小于材料屈服极限。

The seismic response is analyzed for a polar crane used in nuclear power plant. A 3-D finite element model for the polar crane structure is developed using the ANSYS codes. Based on the modal analysis, the seismic response of the crane structure is calculated to an input of the seismic spectrum at the plant floor, where the polar crane is installed and operates. The results show that the crane is generally safe from the seismic input in terms of the structure strength, whereas the structural responses in the horizontal direction are large due to the horizontal seismic input, as the first order natural frequency of lateral bending of the structure is close to the frequencies where the peaks of the seismic spectrum occurs in the horizontal direction.