Abstract
An analysis method to evaluate the sensitivity of structural dynamic response is developed for nonlinear systems in the context of an implicit time integration scheme. The formulation originates in the perturbation method and retains its advantage. Namely, the decomposed effective stiffness matrix after the iteration for each time increment is efficiently used to compute the sensitivity of any parameter in the system. Because it allows the nonlinearity including load path dependency, the proposed method can be applied to a wide range of nonlinear finite element dynamic analyses. An elastic-plastic truss structure is solved to examine the validity of the method, and satisfactory results are obtained.
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