Experimental Study On Concrete-filled Stainless Steel Tubular Flexural Members

As a new structure, the concrete-filled stainless steel tubular structure is expected to have the advantages of ordinary concrete structures and its superior durability, good seismic performance and scalability, low maintenance costs, high capacity and so on. Now, the concrete-filled stainless steel tubular structure has been applied in a number of projects. A series of research work about mechanical properties of concrete-filled stainless steel tubular has been launched at home and abroad, but the research is mainly to the compression member, rarely to the flexural members. Asgar has been the pure bending test study by four concrete-filled stainless steel tubular flexural members.In this paper, the theoretical analysis and experimental research will be taken to research the flexural behavior of concrete-filled stainless steel tubular flexural members. Experimental study, included 27 circular cross-section specimens and 24 square cross-section specimens, introduces the production process of the specimen in details, the installing of loading device, the loading method and measurement program, describes the failure mode of the specimens under the load and analyzes the members’ load-mid span deflection curve, load-mid span longitudinal strain distribution curves, overall deflection curves, ductility and flexural stiffness and so on. It also studies the parameters’ affect to the stainless steel tube concrete specimen, including sectional size, thickness of stainless steel tubular and the strength of concrete.It can be able to describe flexural properties and working mechanism of the concrete-filled stainless steel tubular flexural members accurately if the theoretical analysis is from the whole process of load-mid span deformation curve, but its calculation is too complex to easy application. So it will be simplified to calculate by taking the methods of static equilibrium and give the simplified expressions on the bending capacity of concrete-filled stainless steel tubular flexural members in the paper. At last, the calculation results will be compared with experimental results.