INVESTIGATION ON THE FLEXURAL BEHAVIOUR OF CFST BEAM WITH DIFFERENT CONFIGURATION OF STEEL PLATE REINFORCEMENTS

Concrete filled steel tubes (CFST) are composite structural members consist of hollow steel tubes and concrete as infill. The CFST members are progressively used in the development due to its excellent durability and earthquake-resistant properties. The objectives of this project are to evaluate the improvements made by embedding steel plates into the tensile zone of the concrete core of CFST beams subjected to bending in terms of flexural capacity, stiffness and ductility through experimental works. A total of eight specimens with height of 200 mm and width of 100 mm will be embedded with various quantities, height and thickness of steel plates and the specimens will be tested to study the flexural behaviour of CFST beam with embedded steel plates. Additionally, a total of fourteen coupons were cut from the steel plates and prepared in accordance to BS EN ISO689-1:2016 will be tested under a direct tensile load. Throughout this study, the behaviour of CFST beams with embedded steel plates through its characteristics point such as elastic limit, elastic-plastic range, plasticity, yielding and buckling of steel tubes by generating the moment-curvature relationship will be assessed. The result thus concludes that the CFST beams with higher quantity of steel plates possessed the highest strength and stiffness followed by the thickness and then the height of steel plates given that the steel plates reinforcement area is similar