Finite Element Analysis On Mechanical Performance Of CFRP Steel Reinforced Concrete Filled With Steel Tube Column

As a new structural type, axial static performance of CFRP steel reinforced concrete filled with steel tube concrete column has been studied by our group with finite element software. This paper is to do research on seismic performance of this new-type column by ABAQUS. In order to research on seismic performance of this column under reciprocating load, it is prepared to do simulation the force condition of this column with bending moment and shear first, and then simulate the force condition of this column with bending moment, shear and axial force. It can provide theoretical reference for application of this column in practical engineering to research on seismic performance of this column. The major contents are summarized follows:The force condition of CFRP steel reinforced concrete filled with steel tube concrete column with bending moment and shear is simulated first with consideration of steel tube diameter, CFRP layers, concrete strength and horizontal displacement. It can be seen from load-displacement curves that the shape of load-displacement curves are similar by changing parameters, and initial stiffness changes little or not very obvious.The force condition of CFRP steel reinforced concrete filled with steel tube concrete column with bending moment and shear is simulated then with consideration of five parameters including axial compression ratios, steel tube diameter, CFRP layers, concrete strength and horizontal displacement. It can be seen from load-displacement curves that initial stiffness of specimens in elastic stage changes little or not very obvious with the changing of steel tube diameter, CFRP layers, concrete strength or horizontal displacement, but initial stiffness reduces with the increasing of axial compression ratios. The bearing capacity of specimens reduces with the increasing of axial compression ratios; the bearing capacity of specimens with CFRP decreases obviously compared with no CFRP, and the load which specimen can bear is larger with the increasing of CFRP layers, but increasing magnitude is small.The force condition of this new-type column with reciprocating load is simulated with consideration of five parameters. It can be seen form hysteresis curves and skeleton curves that five parameters have little effect on bending stiffness and hysteresis curves are all full and have no knead shrink phenomenon. Seismic performance and energy dissipation capacity of CFRP steel reinforced concrete filled with steel tube concrete column are very well.