Dissipations in reinforced concrete components Static and dynamicexperimental identification strategy
Abstract
Despite their now well documented drawbacks, viscous damping based models to describe the dissipationsoccurring in reinforced concrete (RC) structures during seismic events are popular among structural engineers.Their computational efficiency and their convenient implementation and identification are indeed attractive. Ofcourse, the choice of a viscous damping model is, most of the time, reasonable, but some questions still arisewhen it comes to calibrate its parameters how do these parameters evolve through the nonlinear time-historyanalysis? How do they interact when several eigenmodes are involved? To address these questions, the IDEFIXexperimental campaign (French acronym for Identification of damping-dissipations in RC structural elements) hasbeen carried out on RC beams set up on the Azalee shaking table of the TAMARIS experimental facility operatedby the French Alternative Energies and Atomic Energy Commission (CEA). First, this experimental campaign ispositioned within an overview of related experimental campaigns in the literature. Second, the IDEFIX experimental campaign is presented. In particular, noticeable results are given by examples of first post-treatments,including an improved so-called areas method, which lead to very different identified damping ratio depending on the method used.