Analysis of Shear Model for Steel-Fiber-Reinforced High-Strength Concrete Corbels with Welded-Anchorage Longitudinal Reinforcement
According to the shear capacity test results of six steel-fiber-reinforced high-strength concrete (SFHSC) corbels with welded-anchorage longitudinal reinforcement under concentrated load, the effects of shear span ratio and steel fiber volume fraction on the failure mode, cracking load and ultimate...
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2023-07-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/14/4907 |
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| author | Shu-Shan Li Die Peng Heng Wang Feng-Jian Zhang Hong-Mei Li Yi-Jun Xie Ai-Jiu Chen Wei Xie |
| author_facet | Shu-Shan Li Die Peng Heng Wang Feng-Jian Zhang Hong-Mei Li Yi-Jun Xie Ai-Jiu Chen Wei Xie |
| author_sort | Shu-Shan Li |
| collection | DOAJ |
| description | According to the shear capacity test results of six steel-fiber-reinforced high-strength concrete (SFHSC) corbels with welded-anchorage longitudinal reinforcement under concentrated load, the effects of shear span ratio and steel fiber volume fraction on the failure mode, cracking load and ultimate load of corbel specimens were analyzed. On the basis of experimental research, the shear transfer mechanism of corbel structure was discussed. Then, a modified softened strut-and-tie model (MSSTM), composed of the diagonal and horizontal mechanisms, was proposed, for steel-fiber-reinforced high-strength concrete corbels. The contributions of concrete, steel fiber and horizontal stirrups to the shear bearing capacity of the corbels were clarified. A calculation method for the shear bearing capacity of steel-fiber-reinforced high-strength concrete corbels was established and was simplified on this basis. The calculation results of the model were compared with the test values and calculation results of the GB50010-2010 code, the ACI318-19 code, the EN 1992-1-1 code and the CSA A23.3-19 code. The results showed that the concrete corbel with small shear span ratio mainly has two typical failure modes: shear failure and diagonal compression failure. With the increase in shear span ratio, the shear capacity of corbels decreases. Steel fiber can improve the ductility of a reinforced concrete corbel, but has little effect on the failure mode of the diagonal section. The calculated values of the national codes were lower than the experimental values, and the results were conservative. The theoretical calculation values of the shear capacity calculation model of the corbels were close to the experimental results. In addition, the model has a clear mechanical concept considering the tensile properties of steel-fiber-reinforced high-strength concrete and the influence of horizontal stirrups, which can reasonably reflect the shear transfer mechanism of corbels. |
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| spelling | doaj.art-3e76ead50d6e4e75b4a56f5264ecb60e2023-11-18T20:14:53ZengMDPI AGMaterials1996-19442023-07-011614490710.3390/ma16144907Analysis of Shear Model for Steel-Fiber-Reinforced High-Strength Concrete Corbels with Welded-Anchorage Longitudinal ReinforcementShu-Shan Li0Die Peng1Heng Wang2Feng-Jian Zhang3Hong-Mei Li4Yi-Jun Xie5Ai-Jiu Chen6Wei Xie7School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaSchool of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaPowerchina Huadong Engineering Corporation Limited, Hangzhou 311122, ChinaSchool of Civil and Transportation Engineering, Henan University of Urban Construction, Pingdingshan 467036, ChinaSchool of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaPowerchina Road Bridge Group Co., Ltd., Beijing 100160, ChinaSchool of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaSchool of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450046, ChinaAccording to the shear capacity test results of six steel-fiber-reinforced high-strength concrete (SFHSC) corbels with welded-anchorage longitudinal reinforcement under concentrated load, the effects of shear span ratio and steel fiber volume fraction on the failure mode, cracking load and ultimate load of corbel specimens were analyzed. On the basis of experimental research, the shear transfer mechanism of corbel structure was discussed. Then, a modified softened strut-and-tie model (MSSTM), composed of the diagonal and horizontal mechanisms, was proposed, for steel-fiber-reinforced high-strength concrete corbels. The contributions of concrete, steel fiber and horizontal stirrups to the shear bearing capacity of the corbels were clarified. A calculation method for the shear bearing capacity of steel-fiber-reinforced high-strength concrete corbels was established and was simplified on this basis. The calculation results of the model were compared with the test values and calculation results of the GB50010-2010 code, the ACI318-19 code, the EN 1992-1-1 code and the CSA A23.3-19 code. The results showed that the concrete corbel with small shear span ratio mainly has two typical failure modes: shear failure and diagonal compression failure. With the increase in shear span ratio, the shear capacity of corbels decreases. Steel fiber can improve the ductility of a reinforced concrete corbel, but has little effect on the failure mode of the diagonal section. The calculated values of the national codes were lower than the experimental values, and the results were conservative. The theoretical calculation values of the shear capacity calculation model of the corbels were close to the experimental results. In addition, the model has a clear mechanical concept considering the tensile properties of steel-fiber-reinforced high-strength concrete and the influence of horizontal stirrups, which can reasonably reflect the shear transfer mechanism of corbels.https://www.mdpi.com/1996-1944/16/14/4907corbelsteel-fiber-reinforced high-strength concrete (SFHSC)welded-anchoragelongitudinal reinforcementshear span ratiosteel fiber volume fractionshear transfer mechanism |
| spellingShingle | Shu-Shan Li Die Peng Heng Wang Feng-Jian Zhang Hong-Mei Li Yi-Jun Xie Ai-Jiu Chen Wei Xie Analysis of Shear Model for Steel-Fiber-Reinforced High-Strength Concrete Corbels with Welded-Anchorage Longitudinal Reinforcement Materials corbel steel-fiber-reinforced high-strength concrete (SFHSC) welded-anchoragelongitudinal reinforcement shear span ratio steel fiber volume fraction shear transfer mechanism |
| title | Analysis of Shear Model for Steel-Fiber-Reinforced High-Strength Concrete Corbels with Welded-Anchorage Longitudinal Reinforcement |
| title_full | Analysis of Shear Model for Steel-Fiber-Reinforced High-Strength Concrete Corbels with Welded-Anchorage Longitudinal Reinforcement |
| title_fullStr | Analysis of Shear Model for Steel-Fiber-Reinforced High-Strength Concrete Corbels with Welded-Anchorage Longitudinal Reinforcement |
| title_full_unstemmed | Analysis of Shear Model for Steel-Fiber-Reinforced High-Strength Concrete Corbels with Welded-Anchorage Longitudinal Reinforcement |
| title_short | Analysis of Shear Model for Steel-Fiber-Reinforced High-Strength Concrete Corbels with Welded-Anchorage Longitudinal Reinforcement |
| title_sort | analysis of shear model for steel fiber reinforced high strength concrete corbels with welded anchorage longitudinal reinforcement |
| topic | corbel steel-fiber-reinforced high-strength concrete (SFHSC) welded-anchoragelongitudinal reinforcement shear span ratio steel fiber volume fraction shear transfer mechanism |
| url | https://www.mdpi.com/1996-1944/16/14/4907 |
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