# An Assessment of the Structural Performance of
## 4 Conclusions  
This paper aimed to determine the effect of different corrosion rates on the flexural performance of RC beams. To analyze this, an experimental study was carried out by preparing two series of RC beams and inducing local rebar corrosion at three different corrosion areas: (1) the entire area, (2) the constant moment area, and (3) the constant shear area). Two series of experimental tests were conducted under different loading types using monotonic and cyclic loading. The results acquired from this study are described below:  
1. The yield load and ultimate load of the RC beams decreased with the increase in the rebar corrosion rate, regardless of the imposed corrosion areas and the loading types. This was consistent with the observed surface longitudinal cracks that developed throughout and adjacent to the corrosion areas as the rebar corrosion rate increased.
2. It was observed that reductions in the ultimate load and yield load became larger in the order of the corroded RC specimens induced at (1) the entire area > (2) the constant moment area > (3) the constant shear area, compared to the value of the referenced uncorroded RC specimen, as the average corrosion rate increased.
3. The test results further revealed that the yield strength and ultimate strength were kept almost equivalent to the uncorroded RC specimen, with average corrosion rates of 10% and 15%, respectively. Over these corrosion rates, the yield strength and ultimate strength were evidently dropped.
4. Compared to the test results under the monotonic loading condition, the structural capacity under the cyclic loading condition decreased with a more pronounced tendency for each corrosion case as the corrosion rate increased. Over a certain threshold of corrosion, the capacity definitely drops, and cyclic loading worsens this condition, presumably due to the bond slippage.
5. The crack spacings in the flexural zone were nearly identical, irrespective of the different corroded RC beams and loading types. A longitudinal crack was developed throughout and adjacent to the corrosion areas, as the corrosion rate increased. It is  
Figure 13: Distribution of cracks for each specimen under cyclic load.  
thus inferred that strength reductions may be strongly influenced by the incurrence of longitudinal cracks.  
H.K.: conceptualization, methodology, and writing--original draft preparation; S.Y. ([PERSON]): analysis and writing--final draft preparation; T.N.: supervision; S.Y. ([PERSON]): validation, and writing--introduction, review, editing. All authors have read and agreed to the published version of the manuscript.  
This research was partially funded by the Gachon University and the 2021 Hongik University in Republic of Korea.  
Not applicable.  
All data of this research were presented in the article.  
This study was conducted under research project (22 RERP-B099755-08) funded by the Ministry of Land, Infrastructure and Transport (MOLIT) and the Korea Agency for Infrastructure Technology Advancement (KAIA). The authors would like to thank the members of the research team, MOLIT, and KAIA for their guidance and support throughout this project.  
The authors declare no conflict of interest.