Identification methods of material‐based damping for cracked reinforced concrete beam models

Seismic performance evaluation in structural design requires the use of sophisticated numerical models. In particular, to accurately represent non-linear behaviour reinforced concrete (RC) structures when subjected dynamic loadings, energy dissipation mechanisms must be represented. However, classical viscous damping models, which are still widely used, not based on physical considerations at material level and choice parameters is often arbitrary. This paper, thus, proposes a time-domain identification method equivalent single-degree-of-freedom (SDOF) systems. The methodology developed using either an updated linear model or energy-dissipating constitutive model. Energy dissipative phenomena cracking, friction unilateral effects upon crack closure. Both models allow different transient variations: (i) With model, intrinsic ratios frequencies identified define simple generic (ii) with described by aim propose that can used anyone complement their own Applying experimental data allows evaluating effective ratio variations as functions variables representative behaviour. It shown it possible missing through internal variables.