Seismic response control of piping system with supplemental devices

Abstract

Seismic loads on piping system due to an earthquake can cause excessive vibrations, which can lead to serious instability resulting in damage or complete failure. In this paper, passive and semi-active supplemental devices have beenstudied to mitigate seismic response and vibration control of piping system used in the process industries, fossil and fissile fuel power plant. A study is conducted onthe performance of passive and semi-active supplemental devices due to variation inparameters of devices and/or with different control algorithms of the damper andsubsequently optimum parameter of devices are obtained. The effectiveness of thepassive and semi-active supplemental devices in terms of reduction in theresponses, namely, displacements, accelerations and base shears of the pipingsystem is investigated by comparing uncontrolled responses under four differentartificial earthquake motions with increasing amplitudes. The analytical resultsobtained using Wen’s model are compared with the corresponding experimentalresults available which indicated a good match with the proposed analytical procedurefor the X-plate dampers. The analytical results demonstrate that the passiveand semi-active supplemental devices under particular optimum parameters are very effective and practically implementable for the seismic response mitigation, vibration control, and seismic requalification of piping systems.