<abstract xmlns="http://www.w3.org/1999/xhtml">The paper aims to select a simple and effective damage index for estimating the extent of damage of rectangular concrete-filled steel tube (RCFT) structures subjected to ground motions. Two experimental databases of cyclic tests conducted on RCFT columns and frames are compiled. Test results from the database are then used to evaluate six different damage indices, including the ductility ratio (<italic>μ</italic>), drift ratio, initial-to-secant stiffness ratio (<italic>DKJ</italic>), modified initial-to-secant stiffness ratio (<italic>Dms</italic>), energy coefficient (<italic>E</italic>), and the combined damage index (<italic>DPA</italic>) as a benchmark indicator. Selection criteria including correlation, efficiency, and proficiency are utilized in the selection process. The optimal alternative for <italic>DPA</italic> is identified on the basis of a comprehensive evaluation. The evaluations indicate that <italic>Dms</italic> previously proposed by some of the authors is the most appropriate substitution of <italic>DPA</italic>, followed by the drift ratio. For the case of the slenderness ratio less than or equal to 30, the same grades of relation between the investigated damage indices and the benchmark are observed. However, in the case of the slenderness ratio larger than 30, the drift ratio tends to be the optimal alternative. In most cases, <italic>μ</italic> is proved to be an inadequate replacement of <italic>DPA</italic>.</abstract>

The paper aims to select a simple and effective damage index for estimating the extent of damage of rectangular concrete-filled steel tube (RCFT) structures subjected to ground motions. Two experimental databases of cyclic tests conducted on RCFT columns and frames are compiled. Test results from the database are then used to evaluate six different damage indices, including the ductility ratio (μ), drift ratio, initial-to-secant stiffness ratio (DKJ), modified initial-to-secant stiffness ratio (Dms), energy coefficient (E), and the combined damage index (DPA) as a benchmark indicator. Selection criteria including correlation, efficiency, and proficiency are utilized in the selection process. The optimal alternative for DPA is identified on the basis of a comprehensive evaluation. The evaluations indicate that Dms previously proposed by some of the authors is the most appropriate substitution of DPA, followed by the drift ratio. For the case of the slenderness ratio less than or equal to 30, the same grades of relation between the investigated damage indices and the benchmark are observed. However, in the case of the slenderness ratio larger than 30, the drift ratio tends to be the optimal alternative. In most cases, μ is proved to be an inadequate replacement of DPA.

Evaluation of Damage Indices for Rectangular Concrete-filled Steel Tube Structures

Earthquake Engineering Research and Test Center

Measurement Science Review

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The paper aims to select a simple and effective damage index for estimating the extent of damage of rectangular concrete-filled steel tube (RCFT) structures...

Evaluation of Damage Indices for Rectangular Concrete-filled Steel Tube Structures

Published Online: Aug 24, 2019

Page range: 170 - 184

Received: Feb 25, 2019

Accepted: Jul 30, 2019

DOI: https://doi.org/10.2478/msr-2019-0023

Keywords
Rectangular concrete-filled steel tube, damage index, cyclic loading, experimental database, slenderness ratio, evaluation

© 2019 Minsheng Guan et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Evaluation of Damage Indices for Rectangular Concrete-filled Steel Tube Structures

Published Online: Aug 24, 2019

Page range: 170 - 184

Received: Feb 25, 2019

Accepted: Jul 30, 2019

DOI: https://doi.org/10.2478/msr-2019-0023

KeywordsRectangular concrete-filled steel tube, damage index, cyclic loading, experimental database, slenderness ratio, evaluation

© 2019 Minsheng Guan et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Rectangular concrete-filled steel tube, damage index, cyclic loading, experimental database, slenderness ratio, evaluation