This example problem is a dynamic simulation of a piping network used in a nuclear power generation system. The problem demonstrates the analysis methods available to account for the effect of higher frequency modes of a structure in a response-spectrum analysis (RSA).
For verification, RSA results are compared to the full-transient analysis results performed on the same model. (In an industrial application, however, a transient analysis approach is computationally intensive and often impractical for analyzing a nuclear piping network.)
The following features and capabilities are highlighted:
Use of the missing-mass response to include the responses of the higher modes in the RSA.
Use of rigid responses (Gupta or Lindley-Yow method) to more accurately combine the modal responses (consisting of both periodic and rigid-response components).