Abstract
In this study,we investigate the change of structural dynamic reliability of piping systems supported by elasto-plastic damper subjected to multiple nonstationary random input excitation,for various setting conditions of elasto-plastic damper.The elasto-plastic damper is assumed to have a bilinear hysteretic characteristics.The piping system is modeled by a simple cantillever beam with a weight at the top end.Analytical model of a piping system is constructed by using finite element method.The support force is expressed by a bilinear model.The inputs are given by white Gaussian noises.In this study,we will maintain the structural integrities of both the piping systems and the elasto-plastic supporting devices by taking three indexes; dynamic reliability of pipings,accumulated energy of support and dynamic reliability of support,into account.Furthermore,the optimal conditions of parameters such as the supporting location,the capacity of supporting devices are searched.Numerical simulations are perfomed using a simple piping system model for multiple random inputs based on probablistic vibration theory.This study is applicable to the seismic design of piping systems supported by elasto-plastic dampers subjected to the actual earthquake inputs.
