In this study, we estimate structural dynamic reliability of piping systems supported by elasto-plastic damper subjected to nonstationary random input excitation. Analytical model of elasto-plastic damper has a bilinear hysteretic characteristics. Analytical model of piping systems is constructed by using finite element method. At first, we make nonstationaty random inputs by combining of stationary random processes and envelop functions. At second, we investigate the stresses of the piping and the absorbed energy of damper for nonstationary random input excitations. At third, we evaluate structural dynamic reliability based on probabilistic vibration theory. This structural dynamic reliability takes into account of the integrity of both the piping systems and elasto-plastic dampers. At last, we examine the effects of the supporting conditions such as supporting locations and capacities of damper on structural dynamic reliability, and also study the impronement of structural dynamic reliability reliability.
