METHOD FOR CALCULATING DYNAMIC NONLINEAR RESPONSE STRUCTURE OPTIMAL SOLUTION USING EQUIVALENT STATIC LOADS

摘要

A method for calculating dynamic nonlinear response structure optimal solution by using equivalent static loads is provided to obtain a solution having high accuracy by performing sensitivity based structure optimal design without the influence from design variables due to that a previous linear structure optical design method can be used. A nonlinear displacement vector is calculated from a nonlinear analysis(S100), and an equivalent static load value is calculated by multiplying the calculated nonlinear displacement vector by a linear stiffness matrix(S200). A linear displacement vector is calculated by processing the equivalent static load value in multi load condition(S300), and a linear structure optimal solution is calculated by using the equivalent static load value(S400). In order to solve the response difference of an optimal result caused by the difference between the sensitivity of dynamic non-linear analysis and the sensitivity of linear static analysis, it is judged based on the calculated equivalent static load value whether or not the difference of the static load value calculated from the above steps is below a specific rate(S500). If so, the optimal solution calculated from the above steps is extracted as the final optimal solution(S600).