Abstract
Modeling by finite element method provides a ground for better perception of the behavior of reinforce columns and it is also useful in prediction of the behavior of these members without the experimental results. The performance improvement depends upon different parameters including the geometry of columns and configuration of reinforcement layers. In this study, slender reinforced columns are modeled under axial and biaxial bending loading with Carbon fiberreinforced polymer (CFRP) with different slender ratios using Abaqus software. The model is validated by the results of Bilchek et al., experiments. In this design, 30 concrete unstrengthened hoop columns with the diameter 100mm and heights 200,400,600,800,1000mm are made and reinforced with bidirectional CFRP composites. In each slenderness, a control sample (unstrengthened) and 5 reinforced specimens with different fiber configurations (hoop, longitudinal, angel and their combination) are tested under axial loading and biaxial bending to the ultimate failure. The results showed that these composites increased strength and ductility of specimens considerably. The results showed that in unstrengthened specimens, by increasing slenderness from 1 to 10, strength and ductility were reduced as 35, 65%, respectively. The results showed that the modeling using experimental data had good consistency. Based on the shortage of experimental data in slender columns at big scale, by performing similar studies, the existing problems can be eliminated.
Highlights
Strengthening concrete structures using traditional materials as applied in the past increased the area surface besides the increase of bearing capacity
H., Nekooei, M., Rahgozar, R., & Narmashiri, K. 2015) evaluated the effect of strengthening short and slender columns using Carbon Fiber Reinforced Polymers (CFRP) layers with two, four layer configurations in transverse and longitudinal directions on small scale specimens. This stud y showed that CFRP wrapping transversely instead of longitudinal increased the capacity of short columns but longitudinal fiber wrapping improved the behavior of slender columns and their ultimate strength like short columns
After processing the data of experiments, strain-stress curve is plotted to show the effect of slenderness on strengthening and the effect of configuration of strengthening layers on strength and ductility of specimen. 4.1 The Evaluation of the Effect of Layers Orientation Figure 4 shows that chart of axial load and biaxial bending based on axial strain of the specimen with the height 200 to 1000mm separately to evaluate the effect of configuration of layers or type of strengthening
Summary
Strengthening concrete structures using traditional materials (concrete, rebar) as applied in the past increased the area surface besides the increase of bearing capacity. Teng presented a theoretical model to predict the behavior of FRP-reinforced hoop RC slender columns and showed that FRP strengthening had high impact on the increase of bearing capacity in slender columns compared to that of short columns 2015) evaluated the effect of strengthening short and slender columns using CFRP layers with two, four layer configurations in transverse and longitudinal directions on small scale specimens This stud y showed that CFRP wrapping transversely instead of longitudinal increased the capacity of short columns but longitudinal fiber wrapping improved the behavior of slender columns and their ultimate strength like short columns. A parametric study is performed based on the changes of slenderness parameter
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