| Autor: |
M. H. Seleem, M. A. Othman, Hesham M. El-Emam, Hossam El-Din M. Sallam, M. Moawad |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Archives of Civil and Mechanical Engineering. 21 |
| ISSN: |
1644-9665 |
| DOI: |
10.1007/s43452-021-00317-0 |
| Popis: |
Flexural behavior of functionally graded concrete (FGC) beams was experimentally investigated. Fourteen sets of beams, including full depth (FD) fiber-reinforced concrete (FRC) and FGC with different patterns and fiber volume fractions (Vf%), were investigated under three-point bending. These patterns consisted of three layers with a constant middle part of lightweight concrete. The upper layer in the compression zone was either normal strength concrete or FRC having different Vf%. The lower layer in the tension zone was made from either FD FRC has the same Vf% or functionally graded FRC. The fibers used were hooked end steel fibers with Vf% of 0.5, 1.0, and 1.5%. The experimental results were also analyzed numerically and analytically. The experimental results showed that the flexural strength of FGC patterns ranged between 94 and 100% from that of FD FRC beams. However, their toughness indices ranged between 49 and 93% of the corresponding value of FD FRC beams. These ratios depend on Vf% and the presence of fibers in the compression zone. The effect of Vf% is more obvious in the descending part of the load–deflection curve than the ascending part due to the presence of fibers bridging phenomenon following the maximum load. Vf% is more pronounced in the descending portion in all FGC patterns than in the FD FRC beams. There is a good agreement between the experimental results and those predicted by analytical and numerical models. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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