Torsional behavior of concrete-filled steel tubular members: State of the mini art review

In civil engineering projects, concrete-filled steel tubular (CFST) members are the composite members that have replaced conventional steel and concrete members. This research aims to provide a mini review of the literature on the torsional behavior of (CFST) members. The results of the previous study indicated that the CFST members ultimate torsional strength increased by incrementing the torsion strength of its composites, i.e. steel tubes and concrete; such as concrete strength, steel yield strength, steel thickness or steel ratio and number of stiffeners. In addition, it was showed from the review of scientific investigation that the CFST members' ultimate torsional strength decreased with the increase of the depth to thickness of the steel tube ratio of its composites. Also, the depth to width ratio had effects on the member performance. The section shape of the composite members had a consider effect on the ultimate torsional strength of the composite members. Generally, the circular tube showed the highest torsional strength compared to traditional quadrilateral shape.