DOI:
https://doi.org/10.11113/jt.v61.1771The damage of steel fiber concrete was mainly because of the pulling out of steel fiber from the concrete, not because of the broken of the steel fiber; therefore, the tensile stress was taken when steel fiber was pulling out as the tensile strength of steel fiber, and in this paper, it was taken as 250 MPa. Double end Hooked Steel Fiber II. LITERATURE REVIEW A lot of research work has been done on shear behaviour and mechanical properties of steel fiber reinforced concrete (SFRC). 9 A study on quality and mechanical properties of engineered steel fibers used as reinforcement for concrete. A Finite Element Analysis (FEA) software package ANSYS 10.0 is used to analyze the shear capacities and introduce a good concrete model for steel fiber reinforced concrete (SFRC) as well as plain concrete made of brick and stone aggregate.
Keywords:
Composite columns, steel tube, finite element, steel fibers, slenderness ratioAbstract
The present study investigates the behavior of steel fiber reinforced concrete filled steel box columns (SFRCFSBC) targeting to enhance their strength. A nonlinear finite element model using ANSYS program has been developed to investigate the structural behavior of the inspected columns. The results obtained from that model has been compared with those calculated using Euro code (EC4), AISC/LRFD (2005) and the Egyptian Code of Practice for Steel Construction (ECPSC/LRFD 2007). The comparison indicated that the results of the model have been evaluated to an acceptable limit of accuracy. A parametric study was carried out to investigate the effect of wall thickness, column slenderness and percentage of steel fiber in concrete on the ultimate strength of composite columns. Confinement of the concrete core provided by the steel case was also investigated. It can be concluded from the results that a considerable increase in compressive and flexural strength may be gained by increasing the steel fiber percentage up to 4%. The highest rate of increase in strength for long columns was about 20% by using steel fiber percentage between 0.5% and 1.0%, while for short and medium columns was about 10% by using steel fiber percentage between 1% and 2%.References
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