Effect of Strengthening Methods on Two-Way Slab under Low-Velocity Impact Loading
In this study, the performance of reinforced concrete slabs strengthened using four methods was investigated under impact loads transferred from the top side to bottom side. The top and bottom sides of test slabs were strengthened by no-slump high-strength, high-ductility concrete (NSHSDC), fiber-re...
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MDPI AG
2020-12-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/24/5603 |
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| author | Sun-Jae Yoo Tian-Feng Yuan Se-Hee Hong Young-Soo Yoon |
| author_facet | Sun-Jae Yoo Tian-Feng Yuan Se-Hee Hong Young-Soo Yoon |
| author_sort | Sun-Jae Yoo |
| collection | DOAJ |
| description | In this study, the performance of reinforced concrete slabs strengthened using four methods was investigated under impact loads transferred from the top side to bottom side. The top and bottom sides of test slabs were strengthened by no-slump high-strength, high-ductility concrete (NSHSDC), fiber-reinforced-polymer (FRP) sheet, and sprayed FRP, respectively. The test results indicated that the test specimens strengthened with FRP series showed a 4% increase in reaction force and a decrease in deflection by more than 20% compared to the non-strengthened specimens. However, the specimen enhanced by the NSHSDC jacket at both the top and bottom sides exhibited the highest reaction force and energy dissipation as well as the above measurements because it contains two types of fibers in the NSHSDC. In addition, the weight loss rate was improved by approximately 0.12% for the NSHSDC specimen, which was the lowest among the specimens when measuring the weight before and after the impact load. Therefore, a linear relationship between the top and bottom strengthening of the NSHSDC and the impact resistance was confirmed, concluding that the NSHSDC is effective for impact resistance when the top and bottom sides are strengthened. The results of the analysis of the existing research show that the NSHSDC is considered to have high impact resistance, even though it has lower resistance than the steel fiber reinforced concrete and ultra-high-performance-concrete, it can be expected to further studies on strengthening of NSHSDC. |
| first_indexed | 2024-03-10T14:14:46Z |
| format | Article |
| id | doaj.art-97d3e704a8b54f32a5db75857123ccd9 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T14:14:46Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-97d3e704a8b54f32a5db75857123ccd92023-11-20T23:55:23ZengMDPI AGMaterials1996-19442020-12-011324560310.3390/ma13245603Effect of Strengthening Methods on Two-Way Slab under Low-Velocity Impact LoadingSun-Jae Yoo0Tian-Feng Yuan1Se-Hee Hong2Young-Soo Yoon3School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 02841, KoreaSchool of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 02841, KoreaSchool of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 02841, KoreaSchool of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 02841, KoreaIn this study, the performance of reinforced concrete slabs strengthened using four methods was investigated under impact loads transferred from the top side to bottom side. The top and bottom sides of test slabs were strengthened by no-slump high-strength, high-ductility concrete (NSHSDC), fiber-reinforced-polymer (FRP) sheet, and sprayed FRP, respectively. The test results indicated that the test specimens strengthened with FRP series showed a 4% increase in reaction force and a decrease in deflection by more than 20% compared to the non-strengthened specimens. However, the specimen enhanced by the NSHSDC jacket at both the top and bottom sides exhibited the highest reaction force and energy dissipation as well as the above measurements because it contains two types of fibers in the NSHSDC. In addition, the weight loss rate was improved by approximately 0.12% for the NSHSDC specimen, which was the lowest among the specimens when measuring the weight before and after the impact load. Therefore, a linear relationship between the top and bottom strengthening of the NSHSDC and the impact resistance was confirmed, concluding that the NSHSDC is effective for impact resistance when the top and bottom sides are strengthened. The results of the analysis of the existing research show that the NSHSDC is considered to have high impact resistance, even though it has lower resistance than the steel fiber reinforced concrete and ultra-high-performance-concrete, it can be expected to further studies on strengthening of NSHSDC.https://www.mdpi.com/1996-1944/13/24/5603strengthening methodsfiber reinforced polymerno-slumphigh-strengthductility concretelow-velocity impact load |
| spellingShingle | Sun-Jae Yoo Tian-Feng Yuan Se-Hee Hong Young-Soo Yoon Effect of Strengthening Methods on Two-Way Slab under Low-Velocity Impact Loading Materials strengthening methods fiber reinforced polymer no-slump high-strength ductility concrete low-velocity impact load |
| title | Effect of Strengthening Methods on Two-Way Slab under Low-Velocity Impact Loading |
| title_full | Effect of Strengthening Methods on Two-Way Slab under Low-Velocity Impact Loading |
| title_fullStr | Effect of Strengthening Methods on Two-Way Slab under Low-Velocity Impact Loading |
| title_full_unstemmed | Effect of Strengthening Methods on Two-Way Slab under Low-Velocity Impact Loading |
| title_short | Effect of Strengthening Methods on Two-Way Slab under Low-Velocity Impact Loading |
| title_sort | effect of strengthening methods on two way slab under low velocity impact loading |
| topic | strengthening methods fiber reinforced polymer no-slump high-strength ductility concrete low-velocity impact load |
| url | https://www.mdpi.com/1996-1944/13/24/5603 |
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