Analysis on the Accuracy of Structural Nonlinear Behavior Evaluation Based on Property of Energy/Displacement Conservation

Abstract

Property of energy/displacement conservation is a simple method for estimating complex behavior of structures during earthquakes. Response obtained by property of energy/displacement conservation and that obtained by nonlinear dynamic analysis are different, but this difference has not been fully investigated. In this study, using many seismic wave observation records with large amplitude, difference of response evaluation was discussed. As a result, property of energy conservation tends to overestimate the response of structures with long natural period, while property of displacement conservation tends to underestimate the response of structures with short natural period. Furthermore, accuracy of property of energy/displacement conservation decreases when it applies to structures with natural period which corresponds to maximal or minimal Fourier amplitudes of the seismic wave.