An experimental-numerical study of tensile behavior of reinforced-UHPC members subject to uniaxial tension
Cracking behavior, including cracking spacing and width, of a reinforced-UHPC (R-UHPC) member is critical to quantitatively evaluate its damage and durability capacity. In this study, totally twenty specimens were loaded to experimentally probe tensile behaviors of R-UHPC specimens, considering the...
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| Published in | Structures (Oxford) Vol. 75; p. 108626 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
01.05.2025
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| Subjects | |
| Online Access | Get full text |
| ISSN | 2352-0124 2352-0124 |
| DOI | 10.1016/j.istruc.2025.108626 |
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| Abstract | Cracking behavior, including cracking spacing and width, of a reinforced-UHPC (R-UHPC) member is critical to quantitatively evaluate its damage and durability capacity. In this study, totally twenty specimens were loaded to experimentally probe tensile behaviors of R-UHPC specimens, considering the variation of fiber contents and reinforcement ratios. With a given reinforcement ratio, higher fiber content (fracture energy of UHPC) would lead to sparse distribution of main cracks and rapid post-peak strength degradation. Therewith, deliberate selection of reinforcement ratio, tensile strength and fracture energy of UHPC was required to guarantee a R-UHPC specimen’s strength and ductility. On the other aspect, a novel numerical simulation framework is proposed, which integrates concrete damage plasticity (CDP) model for UHPC matrix and user-coded zero-thickness cohesive element for bond behavior between UHPC and rebars. The tensile stress-displacement relation is defined in the CDP model to alleviate mesh sensitivity problem. It proves that numerical results precisely reflect the effects of steel fiber content and reinforcement ratio on a R-UHPC specimen’s tensile strength and ductility, as well as its cracking spacing and width.
•Tensile strength of R-UHPC depends on the tensile properties of UHPC and reinforcement ratio.•High fracture energy requires high reinforcement ratio to avoid rapid post-peak strength degradation and poor ductility.•A numerical framework is proposed for the matrix and rebar-matrix interface elements inserted between 2-D and 3-D elements. |
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| AbstractList | Cracking behavior, including cracking spacing and width, of a reinforced-UHPC (R-UHPC) member is critical to quantitatively evaluate its damage and durability capacity. In this study, totally twenty specimens were loaded to experimentally probe tensile behaviors of R-UHPC specimens, considering the variation of fiber contents and reinforcement ratios. With a given reinforcement ratio, higher fiber content (fracture energy of UHPC) would lead to sparse distribution of main cracks and rapid post-peak strength degradation. Therewith, deliberate selection of reinforcement ratio, tensile strength and fracture energy of UHPC was required to guarantee a R-UHPC specimen’s strength and ductility. On the other aspect, a novel numerical simulation framework is proposed, which integrates concrete damage plasticity (CDP) model for UHPC matrix and user-coded zero-thickness cohesive element for bond behavior between UHPC and rebars. The tensile stress-displacement relation is defined in the CDP model to alleviate mesh sensitivity problem. It proves that numerical results precisely reflect the effects of steel fiber content and reinforcement ratio on a R-UHPC specimen’s tensile strength and ductility, as well as its cracking spacing and width.
•Tensile strength of R-UHPC depends on the tensile properties of UHPC and reinforcement ratio.•High fracture energy requires high reinforcement ratio to avoid rapid post-peak strength degradation and poor ductility.•A numerical framework is proposed for the matrix and rebar-matrix interface elements inserted between 2-D and 3-D elements. |
| ArticleNumber | 108626 |
| Author | Liu, Zhao Tong, Teng Wang, Tao Li, Xiaobo |
| Author_xml | – sequence: 1 givenname: Teng surname: Tong fullname: Tong, Teng organization: Key Laboratory of Concrete and Prestressed Concrete Strutures of Ministry of Education, School of Civil Engineering, Southeast University, Nanjing 210096, China – sequence: 2 givenname: Xiaobo orcidid: 0009-0006-3001-8166 surname: Li fullname: Li, Xiaobo organization: School of Civil Engineering, Southeast University, Nanjing, Nanjing 211189, China – sequence: 3 givenname: Tao orcidid: 0009-0001-5766-2211 surname: Wang fullname: Wang, Tao email: 230218688@seu.edu.cn organization: School of Civil Engineering, Southeast University, Nanjing, Nanjing 211189, China – sequence: 4 givenname: Zhao surname: Liu fullname: Liu, Zhao organization: Key Laboratory of Concrete and Prestressed Concrete Strutures of Ministry of Education, School of Civil Engineering, Southeast University, Nanjing 210096, China |
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| Keywords | Cracking UHPC Spacing Bond Width |
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