Modified regression model for bond-slip constitutive relationship between high-strength steel rebars and UHP-FRC based on experimental tests
Ultra-High-Performance Fiber Reinforced Concrete (UHP-FRC) has been widely applied due to its advantages over normal concrete. The bond strength between UHP-FRC and steel reinforcement, especially high-strength steel reinforcing bar, is the premise for an in-depth analysis of UHP-FRC's behavior...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509524000822 |
| _version_ | 1827216792266735616 |
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| author | Bo Yang Kuanhong Mao Jia-Hua Liu Kang Chen Mohamed Elchalakani |
| author_facet | Bo Yang Kuanhong Mao Jia-Hua Liu Kang Chen Mohamed Elchalakani |
| author_sort | Bo Yang |
| collection | DOAJ |
| description | Ultra-High-Performance Fiber Reinforced Concrete (UHP-FRC) has been widely applied due to its advantages over normal concrete. The bond strength between UHP-FRC and steel reinforcement, especially high-strength steel reinforcing bar, is the premise for an in-depth analysis of UHP-FRC's behavior at the component level. A series of 24 pull-out tests were designed considering key variables including embedment length (3d, 4d, 5d and 6d), the steel grades (HRB500 and HRB600) and diameter of rebars (16 mm, 18 mm and 20 mm) based on a mature UHP-FRC mix design. It was found that the bond properties of UHP-FRC with high-strength steel bars were much different from ordinary concrete. The constitutive relationship originally used to describe the bond-slip of ordinary concrete was no longer applicable. Based on the test data, a modified constitutive model was proposed based on the regression method and the fib Model Code 2010. Due to the excessively high bond strength, the effect of strain penetration that was originally presented only in bars with long embedment lengths was also considered in the new bond-slip relationship. The bond stress distribution of different locations was obtained by inner-embedded strain gage and the position function which reflected the change of bond stress was deduced. Combined with the product of the average bond-stress-slip constitutive equation and the position function of UHP-FRC, a more accurate description of the bond-slip constitutive relation was presented. Good agreement with test data was achieved for both the proposed model and position function. |
| first_indexed | 2024-03-08T05:33:48Z |
| format | Article |
| id | doaj.art-419cf76561da4c25b6cab95866ba166c |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2025-03-21T15:08:45Z |
| publishDate | 2024-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-419cf76561da4c25b6cab95866ba166c2024-06-20T06:50:13ZengElsevierCase Studies in Construction Materials2214-50952024-07-0120e02931Modified regression model for bond-slip constitutive relationship between high-strength steel rebars and UHP-FRC based on experimental testsBo Yang0Kuanhong Mao1Jia-Hua Liu2Kang Chen3Mohamed Elchalakani4School of Civil Engineering, Chongqing University, Shabei Street 83, Campus B, Shapingba District, Chongqing, ChinaSchool of Civil Engineering, Chongqing University, Shabei Street 83, Campus B, Shapingba District, Chongqing, ChinaSchool of Civil Engineering, Chongqing University, Shabei Street 83, Campus B, Shapingba District, Chongqing, ChinaDepartment of Civil Engineering, Xi’an Jiaotong-Liverpool Univ., 111 Ren’ai Road, Suzhou 215123, Jiangsu Province, China; Corresponding author.Faculty of Engineering and Mathematical Sciences, The University of Western Australia (M051), 35 Stirling Highway, 6009 Perth, AustraliaUltra-High-Performance Fiber Reinforced Concrete (UHP-FRC) has been widely applied due to its advantages over normal concrete. The bond strength between UHP-FRC and steel reinforcement, especially high-strength steel reinforcing bar, is the premise for an in-depth analysis of UHP-FRC's behavior at the component level. A series of 24 pull-out tests were designed considering key variables including embedment length (3d, 4d, 5d and 6d), the steel grades (HRB500 and HRB600) and diameter of rebars (16 mm, 18 mm and 20 mm) based on a mature UHP-FRC mix design. It was found that the bond properties of UHP-FRC with high-strength steel bars were much different from ordinary concrete. The constitutive relationship originally used to describe the bond-slip of ordinary concrete was no longer applicable. Based on the test data, a modified constitutive model was proposed based on the regression method and the fib Model Code 2010. Due to the excessively high bond strength, the effect of strain penetration that was originally presented only in bars with long embedment lengths was also considered in the new bond-slip relationship. The bond stress distribution of different locations was obtained by inner-embedded strain gage and the position function which reflected the change of bond stress was deduced. Combined with the product of the average bond-stress-slip constitutive equation and the position function of UHP-FRC, a more accurate description of the bond-slip constitutive relation was presented. Good agreement with test data was achieved for both the proposed model and position function.http://www.sciencedirect.com/science/article/pii/S2214509524000822UHP-FRCHigh-strength reinforcing barsBond-slip modelBond stress position function |
| spellingShingle | Bo Yang Kuanhong Mao Jia-Hua Liu Kang Chen Mohamed Elchalakani Modified regression model for bond-slip constitutive relationship between high-strength steel rebars and UHP-FRC based on experimental tests Case Studies in Construction Materials UHP-FRC High-strength reinforcing bars Bond-slip model Bond stress position function |
| title | Modified regression model for bond-slip constitutive relationship between high-strength steel rebars and UHP-FRC based on experimental tests |
| title_full | Modified regression model for bond-slip constitutive relationship between high-strength steel rebars and UHP-FRC based on experimental tests |
| title_fullStr | Modified regression model for bond-slip constitutive relationship between high-strength steel rebars and UHP-FRC based on experimental tests |
| title_full_unstemmed | Modified regression model for bond-slip constitutive relationship between high-strength steel rebars and UHP-FRC based on experimental tests |
| title_short | Modified regression model for bond-slip constitutive relationship between high-strength steel rebars and UHP-FRC based on experimental tests |
| title_sort | modified regression model for bond slip constitutive relationship between high strength steel rebars and uhp frc based on experimental tests |
| topic | UHP-FRC High-strength reinforcing bars Bond-slip model Bond stress position function |
| url | http://www.sciencedirect.com/science/article/pii/S2214509524000822 |
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