Shear Behavior of Fibrous Self Compacting Concrete Deep Beams | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 18, Issue 6, December 2014, Pages 36-58 | ||
| Authors | ||
| Jasim Al-Khafaji; Ihsan Al-Shaarbaf; Wisam Hulail Sultan | ||
| Abstract | ||
| Self compacting concrete (SCC) is a relatively new generation of concrete that is characterized by its liquid nature that makes it appropriate for cast the narrow members such as deep beams without vibration. The work aims to investigate the behavior of SCC deep beams and evaluate their shear capacity especially when steel fibers are used in their construction. The experimental work includes testing twelve reinforced concrete simply supported deep beams cast using self compacting concrete (SCC) with steel fibers to evaluate their shear behavior and strength. All tested beams have dimensions of (100×330×1050) mm and have been subjected to two point loads. The parameters considered are shear span to effective depth ratio (a/d), concrete compressive strength (fʹc) and steel fiber volumetric ratio (Vf). Test results indicated that the increase in (a/d) ratio from 0.6 to 1 leads to decreases in cracking and ultimate shear strengths by average ratios of 25.1 % and 20.6 % respectively. Increasing (fʹc) to the twice of the origin value leads to increases in the cracking and ultimate shear strengths by average ratios of 13.9 % and 48.1 % respectively. Using steel fibers in SCC deep beams improves cracking and ultimate shear strength by average ratios of 33.1 % and 11.4 % respectively when 0.4 % of steel fibers is used while they improve these shear strengths by average ratios of 64.4 % and 23 % when 0.8 % of steel fibers is used. The analytical work includes derivation of new equation for predicting ultimate shear strength of fibrous SCC deep beams depending on regression analysis of test results. The new proposed equation gives good agreement with the experimental results by comparison with the ACI318M-1999 Code equation and Rao-2012 Equation. | ||
| Keywords | ||
| self compacting concrete; shear; deep beams; Steel Fibers; high strength | ||
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