核环吊单点激励与多点激励地震响应对比分析OA

In order to study the effect of multi-support excitation on seismic analysis of nuclear polar crane,a finite element model of nuclear polar crane is established considering nonlinear factors.The different time-history analysis methods of multi-support excitation and single-point excitation are compared.And 300,600,1 000 m/s,three kinds of apparent wave velocity are selected as traveling wave effect conditions to carry out multi-support excitation seismic analysis of nuclear polar crane.The results show that the seismic response results obtained by single-point excitation and each method of multi-support excitation with the same seismic wave input are close to each other.Under traveling wave effect,the force of each component of the nuclear polar crane changes differently,the stress response of most structures decreases,and the peak values of wire rope force,horizontal wheel force and vertical trolley force vary by—20％～13％compared with the single-point excitation results.The law of structural response changing with apparent wave velocity is different due to different components and the direction of seismic wave propagation.The calculation method should be selected reasonably according to the actual needs of the project in order to make the seismic performance evaluation of the nuclear polar crane more authentic and comprehensive.