Publicação
A parametric study on the use of strain softening/hardening FRC for RC elements failing in bending
| Resumo: | Using a design oriented model, which was recently developed for the prediction of the moment-curvature relationship of a cross section of beams made by strain softening or strain hardening fiber reinforced concrete (FRC) and that can also include a certain percentage of longitudinal steel bars, a parametric study is carried out to evidence the effect of relevant characteristics of the post-cracking behavior of these materials in the moment-curvature and force-deflection responses of this type of structural elements. The study also analyzes the influence of the reinforcement ratio of longitudinal steel bars, r, in order to show that for a certain content of fibers the benefits of fiber reinforcement, mainly at serviceability limit state conditions, decrease with the increase of r. Adopting the formulation of Model Code 2010, the moment-crack width relationship of FRC beams reinforced with steel bars are obtained and the predictive performance of this approach is assessed by comparing analytical and experimental results. |
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| Autores principais: | Barros, Joaquim A. O. |
| Outros Autores: | Taheri, Mahsa; Salehian, Hamidreza |
| Assunto: | Fiber reinforced concrete Strain softening Strain hardening Longitudinal steel bars Moment-curvature response Force-deflection response Flexural failure Crack width |
| Ano: | 2012 |
| País: | Portugal |
| Tipo de documento: | preprint |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | Using a design oriented model, which was recently developed for the prediction of the moment-curvature relationship of a cross section of beams made by strain softening or strain hardening fiber reinforced concrete (FRC) and that can also include a certain percentage of longitudinal steel bars, a parametric study is carried out to evidence the effect of relevant characteristics of the post-cracking behavior of these materials in the moment-curvature and force-deflection responses of this type of structural elements. The study also analyzes the influence of the reinforcement ratio of longitudinal steel bars, r, in order to show that for a certain content of fibers the benefits of fiber reinforcement, mainly at serviceability limit state conditions, decrease with the increase of r. Adopting the formulation of Model Code 2010, the moment-crack width relationship of FRC beams reinforced with steel bars are obtained and the predictive performance of this approach is assessed by comparing analytical and experimental results. |
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