Nonlinear Finite Element Analysis Of SRC Members Subjected To Torsion

Steel-encased composite members (SRC), consisting of reinforced concrete and structural steel in the center of the section, are widely used in buildings because the properties of the concrete and steel can be fully utilized. Recently, studies on SRC members are focused on responses under bending moment, shear, seismic performance and the mechanical behavior of joints. The investigation of SRC members subjected to torsion is rare. Finite element analysis of SRC members by ANSYS is established to simulate the torsion performance of the members.Finite element analysis is the important part of the structure investigation, because it can simulate the mechanic behavior of the structure properly. In this paper, element models for SRC members subjected to torsion are established for nonlinear finite analysis, and the analysis results are compared to the experiment results. The ultimate load, the stress of the concrete, steel bars and steel structure, and the development of the crack are analyzed. The influence of the thickness of concrete cover for the steel structure is discussed, too. Based on the experiments and analyses of the members subjected to torsion, the crack torsion strength and ultimate torsion strength are investigated. The SRC members subjected to the combination with torsion and axial load are analyzed, and the results show that the as the increasing of the axial load, the ultimate torsion strength is increasing and then decreasing. The torsion and bending moment of SRC members are interrelated. The thesis' conclusion would be help for further investigation of the SRC members.