Flexural performance of reinforced concrete-encased concrete filled steel tubes

This study was presented to demonstrate how steel pipe beams behave with concrete CFST under pure bending, laboratory tests were performed on twelve test samples, which included two units of concrete CFST beam samples, a test that included ten sample units were classified into three groups It is as follows: Two units of reinforced concrete with two different reinforcing diameters (8 mm, 12 mm) free of steel tube beam (control) as a control element. Four units of hollow steel tube were encapsulated with external reinforced concrete (control) with different reinforcing diameters (8 mm, 12 mm) and different thicknesses of the steel tube (1.5 mm, 3 mm) Hollow. The last four units En-cased (CFST) steel tube filled with control reinforced concrete containing different rebar diameters (8mm, 12mm) and steel tube with different thicknesses (1.5mm, 3mm), the important factors were relied on in this study. It is the nature of the use of the tube and the diameter of the rebar based on these parameters, the bending moment against the deflection in the mid-range and the deflection curves, the bending curves, the bending stiffness, the bending ability. Ductility was examined, and the results of the laboratory work showed a clear improvement in the instantaneous amplitude and strength of the CFST beams over Steel pipe beams filled with concrete. As confirmed by this study.