The modal analysis of the model is carried out to obtain the natural frequency (or natural period) of each order of the model. Because more accurate mode shape can be obtained by using the consistent mass matrix, this paper uses the method of consistent mass matrix to solve the problem. See Table 3 for the first three steps of natural frequency and natural period. The calculation result of the first step of natural period is larger than that of section 6.4 of GB / t12337-2014 steel spherical tank, which corresponds to the response spectrum curve in the standard and the calculation method in the standard The numerical value of seismic influence coefficient corresponding to the vibration period is large, which shows that the standard calculation results are conservative.<br>
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