Elasto-Plastic Vibration Analysis of Piping System

In order to meet the qualifications for design of piping with respect to the earthquake inputs which are required to consider increment of the intensity, earthquake resistant design will be required to consider a piping component behaving in both its elastic and plastic regions. The elasto-plastic vibration analysis of piping is extremely difficult to perform in a generalized form. So, a piping simple in configuration was used to find elasto-plastic properties when it was vibrated. Two methods were devised for approximate elasto-plastic vibration analysis of complicated piping structures considering the elasto-plastic properties obtained from the vibration tests using a piping simple in configurations: one using a modal analysis methods and the other using equivalent linear damping. Calculated results obtained by applying these methods were compared with experimental data for verification of validity of these methods.