Tension-Stiffening of Reinforced HVFA-SCC Beams

Prediction of cracking behavior and deformation of reinforced concrete is a complex problem, including reinforced concrete that can still bear tensile stress after cracking due to the bond between reinforcement and surrounding concrete, termed the tension-stiffening effect. This research aims to determine the tension-stiffening of reinforced High Volume Fly Ash Self-compacting Concrete (HVFA-SCC) at various tensile reinforcement ratios. In this tension-stiffening analysis, shrinkage and creep effects are taken away. The data used in the analysis was obtained from beams tested with two loading points. The tests were conducted on six reinforced HVFA-SCC beams and six Normal Concrete (NC) beams with dimensions of 150 x 250 x 2000 mm, with tensile reinforcement ratios of 0.61%, 1.10% and 1.55%. The analysis shows that the effect of creep on shrinkage is negligible, so that it can be ignored in the calculation. On the other hand, shrinkage increases the value of the maximum tension-stiffening stress by 1.43% and the ultimate tension-stiffening stress (𝜎𝑡𝑠,u) by 72.51% from the initial tension-stiffening values. The greater the tensile reinforcement ratio in concrete, the smaller the effect of tension-stiffening stress. KEYWORDS: Creep, HVFA-SCC, NC, RC beams, Shrinkage, Tension-stiffening.