The present invention relates to a method of calculating a nonlinear dynamic response structural optimal solution using equivalent static loads. According to the method of calculating a nonlinear dynamic response structural optimal solution using equivalent static loads of the present invention, at the first step, nonlinear displacement vectors are calculated through nonlinear dynamic analysis. At the second step, equivalent static loads are calculated by multiplying the nonlinear displacement vectors calculated at the first step by a linear stiffness matrix. At the third step, a linear structural optimal solution is calculated using the equivalent static loads which are considered as multiple loading conditions in linear response structural optimization.
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