The behavior of energy dissipation devices and seismic isolation during near-fault ground motions

Abstract

Strong motion records with extended speed pulses a high magnitude and considerable displacements in areas around the source are produced by the action of directivity Constructions exposed to this type of earthquake should be able to sustain significant deformations and quickly release enormous amounts of energy Power dissipation and seismic design technologies were created recently in order to lessen the disastrous effects of earthquakes in general There are varying opinions regarding these devices efficacy in preventing nearfault earthquakes The objective of this study is to numerically analyse how two different types of seismic safety systems respond to nearfault earthquakes A useful set of data for the study of numerical models is provided by the unique characteristics of nearfault earthquakes The heat removal mechanisms employed were buckling restricted braces and a hybrid separation system composed of poroelastic dampers and steel helical springs Basic models are evaluated nonlinearly with seismic safety devices The results show that the responses of the two buildings evaluated with protective devices cannot be described by a single ground motion characteristic Several of the responder parameters show significant variation