Abstract
A sensitivity analysis code for the elastic-plastic dynamic response of piping systems is developed in the context of implicit time integration schemes. The formulation of sensitivity analysis originates in the perturbation method and retain its advantage. Namely, the decomposed effective stiffness matrix after the iteration for each increment is efficiently used to compute the sensitivity of any parameter involved in the piping system. A residual heat remover of PWR under an earthquake loading is analyzed based on the present method with the isoparametric elbow element proposed by Bathe, and satisfactory results are obtained.
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