Research Article
Equivalent Viscous Damping Ratio Model for Flexure Critical Reinforced Concrete Columns
Table 2
Statistical results of the EVD ratio predicted by various models to those derived from experimental data.
| Model | Equation of equivalent damping ratio | Mean | Covariance |
| Rosenblueth [9] | | = 0.05 | 1.579 | 0.238 | = 0.10 | 1.373 | 0.258 | Gülkan and Sozen [15] | | 0.592 | 0.272 | Iwan [16] | | 0.571 | 0.298 | Kowalsky [12] | | = 0.05 | 0.823 | 0.266 | = 0.10 | 0.642 | 0.286 | Hwang [28] | | 0.901 | 0.245 | Kwan and Billington [17] | | 0.839 | 0.244 | Iwan and Guyader [29] | | 0.519 | 0.252 | Cheng and Ye [30] | | 0.778 | 0.264 | Proposed | Equation (16a)–(16c) | 1.025 | 0.202 |
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Note. is the ratio of postyield stiffness to yield stiffness of the envelop curve of the structures and members. |