Abstract
Currently, assessing the performance and safety of reinforced concrete structures relies on routine-based visual inspection (VI). Cracks width measurements are commonly used as a convenient indicator of damage; however other factors, such as distribution and pattern of the cracks should be considered equally important in measuring the extent of damage present in the structure. As a result, condition assessed by VI is subjective in nature and depends on the experience, knowledge, expertise, and judgment of the inspector carrying out the assessment. A new approach based on the fractal analysis of residual crack patterns is proposed in this paper to assess the structural integrity of reinforced concrete elements. A new damage index is presented to quantitatively perform a damage classification. The methodology is validated through experimental studies on two large-scale reinforced concrete shear walls subjected to a displacement controlled reversed cyclic loading. Damage grades are also identified based on width of cracks and proposed damage index (DI). The results demonstrate a more accurate estimation of damage grades using DI. Furthermore, it is demonstrated that the DI can estimate the relative stiffness loss of the specimens with acceptable accuracy.
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Abbreviations
- DG:
-
Damage grade
- FD:
-
Fractal dimension
- DI:
-
Damage index
- HD:
-
High definition
- IAEA:
-
International atomic energy agency
- LS:
-
Load step
- NDE:
-
Non-destructive evaluation
- RC:
-
Reinforced concrete
- RT :
-
Transition box size
- RO :
-
Object box size
- RS :
-
Structure box size
- RD :
-
Discretization size
- RCSW:
-
Reinforced concrete shear wall
- RSL:
-
Relative stiffness loss
- SHM:
-
Structural health monitoring
- SW:
-
Shear wall
- VI:
-
Visual inspection
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Acknowledgments
The authors acknowledge National Science Foundation (NSF) for providing the financial support under Grant No. CMMI-0829978. The experiments presented herein could not have been completed without contributions from the staff of the Structural Engineering and Earthquake Simulation Laboratory (SEESL) of the State University of New York at Buffalo. The financial support and work of the SEESL staff are gratefully acknowledged. The authors also acknowledge the advice and help provided by the technical staff at the NEES Equipment Site at the University at Buffalo.
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Farhidzadeh, A., Dehghan-Niri, E., Moustafa, A. et al. Damage Assessment of Reinforced Concrete Structures Using Fractal Analysis of Residual Crack Patterns. Exp Mech 53, 1607–1619 (2013). https://doi.org/10.1007/s11340-013-9769-7
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DOI: https://doi.org/10.1007/s11340-013-9769-7