Size effect on the flexural behavior of UHPFRC beams and RC beams strengthened with UHPFRC
Abstract The presence of fibers in Ultra-High-Performance Fiber Reinforced Concrete (UHPFRC) considerably affects the mechanical behavior of structural elements constructed from this material. While the flexural strength of traditional reinforced concrete beams is size-independent, this is not the...
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Instituto Brasileiro do Concreto (IBRACON)
2025-01-01
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| Series: | Revista IBRACON de Estruturas e Materiais |
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| author | Felipe Augusto da Silva Barbosa Ramoel Serafini Antonio Domingues de Figueiredo Luís Antônio Guimarães Bitencourt Júnior |
| author_facet | Felipe Augusto da Silva Barbosa Ramoel Serafini Antonio Domingues de Figueiredo Luís Antônio Guimarães Bitencourt Júnior |
| author_sort | Felipe Augusto da Silva Barbosa |
| collection | DOAJ |
| description | Abstract The presence of fibers in Ultra-High-Performance Fiber Reinforced Concrete (UHPFRC) considerably affects the mechanical behavior of structural elements constructed from this material. While the flexural strength of traditional reinforced concrete beams is size-independent, this is not the case for UHPFRC. A numerical procedure based on cross-section equilibrium and compatibility is proposed here to parametrically investigate this size effect in both reinforced concrete beams strengthened with UHPFRC and pure UHPFRC beams. The flexural capacities computed using the numerical method agreed with those obtained experimentally from 14 experimental programs, with an average numerical-experimental ratio of 1.09 and a correlational coefficient of 0.94. Regarding the strengthened beams, the maximum flexural stresses were computed for three different strengthening layouts, considering heights from 100 to 2000 mm. As regards pure UHPFRC beams, the flexural strengths were computed for the same range of heights considering different fiber-volume ratios, as well as fiber lengths. The results show that three-side jacket beams are the most sensitive to the size effect, increasing the flexural strength of small members up to 697%. The beams strengthened on the compressive zone are the least sensitive, with an increase of 31% for the majority of beams. For pure UHPFRC beams, the results indicate that high fiber contents, such as 4%, led to a pronounced size effect, with increases in flexural strength of up to 1052% for the smallest beam compared to the concrete without fibers. Conversely, the use of 35 mm fibers instead of 13 mm attenuated the size effect, reducing the difference between the flexural strength of the smallest and the tallest members from 60 to 46%. |
| format | Article |
| id | doaj-art-a1da0619bfff4fd1bcfbcdcc136a233b |
| institution | Kabale University |
| issn | 1983-4195 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Instituto Brasileiro do Concreto (IBRACON) |
| record_format | Article |
| series | Revista IBRACON de Estruturas e Materiais |
| spelling | doaj-art-a1da0619bfff4fd1bcfbcdcc136a233b2025-01-21T07:39:12ZengInstituto Brasileiro do Concreto (IBRACON)Revista IBRACON de Estruturas e Materiais1983-41952025-01-0118110.1590/s1983-41952025000800013Size effect on the flexural behavior of UHPFRC beams and RC beams strengthened with UHPFRCFelipe Augusto da Silva Barbosahttps://orcid.org/0000-0002-5632-283XRamoel Serafinihttps://orcid.org/0000-0002-7698-649XAntonio Domingues de Figueiredohttps://orcid.org/0000-0003-4658-3355Luís Antônio Guimarães Bitencourt Júniorhttps://orcid.org/0000-0003-1396-3319 Abstract The presence of fibers in Ultra-High-Performance Fiber Reinforced Concrete (UHPFRC) considerably affects the mechanical behavior of structural elements constructed from this material. While the flexural strength of traditional reinforced concrete beams is size-independent, this is not the case for UHPFRC. A numerical procedure based on cross-section equilibrium and compatibility is proposed here to parametrically investigate this size effect in both reinforced concrete beams strengthened with UHPFRC and pure UHPFRC beams. The flexural capacities computed using the numerical method agreed with those obtained experimentally from 14 experimental programs, with an average numerical-experimental ratio of 1.09 and a correlational coefficient of 0.94. Regarding the strengthened beams, the maximum flexural stresses were computed for three different strengthening layouts, considering heights from 100 to 2000 mm. As regards pure UHPFRC beams, the flexural strengths were computed for the same range of heights considering different fiber-volume ratios, as well as fiber lengths. The results show that three-side jacket beams are the most sensitive to the size effect, increasing the flexural strength of small members up to 697%. The beams strengthened on the compressive zone are the least sensitive, with an increase of 31% for the majority of beams. For pure UHPFRC beams, the results indicate that high fiber contents, such as 4%, led to a pronounced size effect, with increases in flexural strength of up to 1052% for the smallest beam compared to the concrete without fibers. Conversely, the use of 35 mm fibers instead of 13 mm attenuated the size effect, reducing the difference between the flexural strength of the smallest and the tallest members from 60 to 46%.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952025000100211&lng=en&tlng=enUHPFRCsize effectflexural strengthcrack widthparametric study |
| spellingShingle | Felipe Augusto da Silva Barbosa Ramoel Serafini Antonio Domingues de Figueiredo Luís Antônio Guimarães Bitencourt Júnior Size effect on the flexural behavior of UHPFRC beams and RC beams strengthened with UHPFRC Revista IBRACON de Estruturas e Materiais UHPFRC size effect flexural strength crack width parametric study |
| title | Size effect on the flexural behavior of UHPFRC beams and RC beams strengthened with UHPFRC |
| title_full | Size effect on the flexural behavior of UHPFRC beams and RC beams strengthened with UHPFRC |
| title_fullStr | Size effect on the flexural behavior of UHPFRC beams and RC beams strengthened with UHPFRC |
| title_full_unstemmed | Size effect on the flexural behavior of UHPFRC beams and RC beams strengthened with UHPFRC |
| title_short | Size effect on the flexural behavior of UHPFRC beams and RC beams strengthened with UHPFRC |
| title_sort | size effect on the flexural behavior of uhpfrc beams and rc beams strengthened with uhpfrc |
| topic | UHPFRC size effect flexural strength crack width parametric study |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952025000100211&lng=en&tlng=en |
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