Jordan Journal of Civil Engineering

Predicting the Seismic Response of Structures Employing Controlled Rocking As a Form of Base Isolation


Omar Shamayleh;


A wide variety of rocking systems have been proposed to reduce damage induced by earthquakes. These systems rely on rocking as a form of base isolation, but also employ post-tensioning to limit rocking amplitude and ensure re-centering of the system. Often, performance-based design approaches (i.e., static pushover) are used to predict the response of these systems. This paper employs a simple analytical model to investigate the response of post-tensioned flexible rocking structures using two different approaches. First, analytical dynamics approach is used to predict the full dynamic response. Second, a performance- based design approach is used to predict the maximum response. The simple model allows a wide parametric study to determine the effects of relative tendon stiffness, relative structural stiffness and rocking parameters, on the maximum response. Comparison of the results defines limits for the relative tendon stiffness and the rocking amplitudes for which performance- based design approaches are reliable. Beyond these limits, the full dynamic response must be considered. In addition, the results give insight into the parameters for which the benefits of rocking behavior can best be exploited.


Rocking, Earthquake engineering, Seismic response, Base isolation, Perfromancebased design